grey leaf spot of maize management

If you would like to, you can learn more about the cookies we use. No commercial hybrids, resistant to the disease have so far been identified. © Copyright 2020 CAB International. maydis Ellis and Everh., occurs on <75% smallholder maize (Zea mays L.) farms in East Africa, and … Farming Systems and Management - ... Gray leaf spot of Maize. By Pierce Anderson Paul. Epidemiology and management of gray leaf spot: A new disease of maize in South Africa. Ward JMJ, 1996. veins, this is streak virus and not leaf spot fungus. Grey leaf spot disease management in maize Cercospora zeae-maydis. Probabilities for profitable fungicide use against gray leaf spot in hybrid maize. possible. It causes grey rectangular spots that stretch along the Phytopathology 91:477-484. Grey leaf spot (GLS) is a fungal disease that can greatly lower maize yields since it reduces the photosynthetic leaf area. ©CAB International. Fungicides may be needed to prevent significant loss when plants are infected early and environmental conditions favor disease. We used genetic mapping to refine understanding of the genetic architecture of GLS … season. Diagnosis/Identification The objective of this research was to evaluate the effect of composted poultry and cattle manures on development of gray leaf spot and yield of maize. lower leaves of the maize plants and infects them. In recent years, gray leaf spot (GLS) has become a major yield‐limiting disease, resulting in grain yield losses as high as 60% in high yield potential maize (Zea mays L.) production areas. Spores, surviving in the remains of previous crops, are rain-splashed When the weather is good, the fungus begins to develop on residues Models were developed to assess the risk and predict the severity of gray leaf spot of maize, and to describe relationships between environmental variables and the rate of lesion expansion and sporulation of the causal organism, Cercospora zeae-maydis. Grey PDF | On Oct 1, 1999, Julian M. J. All corn hybrids and inbreds are susceptible to Gray Leaf Spot (GLS). Very good tolerance to Grey Leaf Spot; Very good tolerance to NCLS; Excellent tolerance to cob rot; Recommended for region I, II and III of Zambia (all regions). Quantitative resistance to GLS does exist; therefore, one method of controlling the disease is to develop hybrids with genetic resistance. Not only is it a threat to maize production in the commercial farming sector, it also […] On the underside of the leaf Quantitative resistance, although poorly understood, is important for GLS management. Before spraying, Gray leaf spot initially appears as spots on the leaves that are round or oval, tan in color, and have a dark brown border. A-Z Journals Browse By Subject. Gray leaf spot is one of the major constraints of maize production in Ethiopia where warm humid environmental condition is prevailing. If you see many yellow thin long streaks along the Following these five chapters are a summary and general conclusions, and appendix. and produces a powdery substance. The Residue Management C. zeae-maydis cannot successfully survive in debris . the plant will also be affected. Of diseases, grey leaf spot is one of the major foliar diseases threatening maize production in Ethiopia. Immature GLS lesions can be easily confused with lesions caused by other pathogens; e.g., eyespot (Kabatiella), anthracnose (Colletrichum). It is necessary to determine the distribution and aetiology of the disease across all the maize production agro-ecologies Plant Disease 86:1127-1133 Munkvold, G.P. Abstract Grey leaf spot disease of maize caused by Cercospora zeae-maydis seriously decreased grain yields in the province of KwaZulu-Natal, South Africa, and spread to maize in neighbouring provinces. Individual lesions may be 3 to 4 inches long and 1/16 to 1/8 inch wide, depending on the distance between veins. Executive Summary Grey leaf spot (GLS), caused by Cercospora zeae-maydis and, to a lesser extent, Cercospora sorghi var. In Kenya, the disease is caused by C. zeina but there are a few instances in which C. sorghi var. Epidemiology and management of grey leaf spot : a new disease of maize in South Africa. Typical grey leaf spots due to the The disease is spreading to neighbouring provinces and countries. Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1996. maydis (another different fungus) has been isolated from typical GLS lesions on maize. Gray leaf spot incited by Cercospora zeae maydis, is an important disease of maize (Zea mays L.) world-wide. Ethiopia Share . Management strategies for maize grey leaf spot (Cercospora zeae-maydis) in Kenya and Zimbabwe DFID No. CABI is a registered EU trademark. If you would like to, you can learn more about the cookies we use. -products or Tebuconazole-products in a 16 litre sprayer. Susceptible hybrids planted in no-till or reduced-till fields are at high risk for gray leaf spot development, but weather is the primary influence on disease develop-ment. observe the weather to ensure that it will not rain until at least 6 hours Gray leaf spot (GLS), caused by the fungus Cercospora zeae-maydis, has been one of the most prevalent foliar fungal diseases of corn in the state of Ohio ever since it was first reported in parts of Pickaway, Ross, Pike and Scioto counties in 1978. Zambia Share . Ward JMJ, Hohls T, Laing MD, Rijkenberg FHJ, 1996. with legumes such as beans, cowpeas and groundnuts, or cereals other than maize, You may Grey leaf spot disease (GLS), Cercospora zeae-maydis, which has previously been attributed to diverse pathogen species in other countries, has become a serious biotic constraint to production of maize (Zea mays L.) in Kenya. Zambia. When maize is affected early in the season, R7566 (NR International No. Grey leaf spot, Cercospora zeae-maydis, has, in a relatively short period, caused significant annual grain yield losses in the maize industry of KwaZulu-Natal, South Africa. The early GLS lesions are yellow to tan in color and look very similar to those of other diseases, except that they often have a faint watery halo which can be seen when held up to the light (Fig. Later, the upper leaves of It has become well established in the province of KwaZulu-Natal, and is capable of reducing grain yields by 20 to 60%. The responses of 64 commercial hybrids to grey leaf spot under fungicide treatment were studied over 2 seasons. The causal organism associated with the disease is Cercospora zeae-maydis. If not well managed it can Stalk rot Seed rot ... Maize leaf fleck Maize leaf fleck virus (MLFV) Maize line* Maize line virus (MLV) Maize mosaic (corn leaf stripe, enanismo rayado) Abstract Grey leaf spot disease of maize caused by Cercospora zeae-maydis seriously decreased grain yields in the province of KwaZulu-Natal, South Africa, and spread to maize in neighbouring provinces. Anonymous National Anti-corruption Hotline: 0800 701 701 Drought Intervention Hotline: 0800 000 996 Abstract. This is to ensure that we give you the best experience Symptoms Symptoms of gray leaf spot are usually first noticed in the lower leaves. Introduction Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. The trials were evaluated for disease severity and grain yields. Epidemiology and predictive management of gray leaf spot of maize . ©CAB International. SUMMARY: Grey leaf spot of maize has emerged as a yield-limiting disease throughout USA and southern Africa in the last 25 years. Fungicide responses of maize hybrids to grey leaf spot. Grey leaf spot (GLS) is a global maize leaf disease that seriously endangers maize production. disease survives on maize residues left on the soil surface from season to Find out about symptoms and management. The disease is now recognised as one of the most significant yield-limiting diseases of maize worldwide and certainly in the province of KwaZulu-Natal (see Table 1). ZA 0371) FINAL TECHNICAL REPORT 1 April 2000 – 31 March 2003 Dr Sarah Simons CAB International – Africa Regional Centre 31 March 2003 "This publication is an output from a research project funded by the United Kingdom Department for International … Published under a CC-BY-SA 4.0 licence. Get all of the factsheets and pest management decision guides from this website in an offline format via the Plantwise Factsheets Library app. leaf spot resistant maize varieties available from various seed companies. 1B). These treatments also suppressed sporulation of P. sorghi on diseased foliage. Authors: Mathews Matimelo, Kanyanta Musonda. Although thought to be one species of fungus, Cercospora zeae-maydis, molecular tests have shown that another fungus, C. zeina, is dominant in eastern USA and southern Africa. Rotate maize You may also consider spraying fungicides when Discovering and utilizing genetic loci for GLS resistance would be useful for breeding new varieties with improved resistance. Leaf extracts of Prosophis chilensis and Azadirachta indica were found to be equally effective as P. fluorescens in controlling maize downy mildew, although the extracts were not as effective at inhibiting conidial germination as the pseudomonad or as metalaxyl. Maize Leaf Spot Management masuzi January 21, 2020 Uncategorized 0 Northern corn leaf spot umn extension grey leaf spot of maize pests diseases diffeiating corn leaf diseases northern corn leaf … PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST . grey leaf spot disease. The objective was to assess the distribution and importance of Grey Leaf Spot. University of Natal, Pietermaritzburg 3200, South Africa. CABI is a registered EU trademark. PhD thesis. Preventative management strategies can reduce econom-ic losses due to gray leaf spot. INTRODUCTION. Grey leaf spot disease (GLS), Cercospora zeae-maydis, which has previously been attributed to diverse pathogen species in other countries, has become a serious biotic constraint to production of maize (Zea mays L.) in Kenya. Management Practices to Reduce Gray Leaf Spot of Maize Author: Ward, J. M. J., Laing, M. D., Cairns, A. L. P. Source: Crop science 1997 v.37 no.4 pp. The United States and South Africa are main areas where research on the disease has been concentrated. In minimum tillage fields with a history of GLS, symptoms can occur on the lower leaves prior to tasseling. Continuing to use www.plantwise.org/KnowledgeBank means you agree to our use of cookies. cover the whole leaf, causing it to turn brown. Published under a CC-BY-SA 4.0 licence. leaf veins on the top surface of the leaf. thesis curvularia leaf spot of maize and its integrated management. PhD thesis. time, preferably at the onset of rains, because the disease will attack later. cause high losses. ), Deep tillage to at least 15 cm three time before planting, After harvest remove infected crop residues and burn before planting to reduce fungi levels in the field, Do not use infected maize stovers (leaves and stems) as mulching material, Synchronise planting time with decreased chance of disease occurrence - if the disease is predicted to occur early then plant late, and plant early if the disease is predicted late in the season, Observe the field weekly after plant emergence for occurrence of symptoms, Early symptoms include pin point sized leaf spots with yellow halos visible on the lower leaves. Planting Grey leaf spot is a serious fungal disease of maize. 17. Gray leaf spot is one of the major constraints of maize production in Ethiopia where warm humid environmental condition is prevailing. leaf spot on maize. Discovering and utilizing genetic loci for GLS resistance would be useful for breeding new varieties with improved resistance. Grey leaf spot of maize, (Zea maydis L.) (Cercospora zeae-maydis) Tehon and Daniels, is one of the most destructive leaf diseases of maize. also improve the soil. 1A). Abstract. We developed a real-time SYBR® Green PCR assay for quantification of grey leaf spot disease in maize based on the amplification of a frag-ment of a cytochrome P450 reductase (cpr1) gene. Find Out More Find more publications in the Diseases of Corn series by visiting the Purdue Extension Education Store Academia.edu is a platform for academics to share research papers. No commercial hybrids, resistant to the disease have so far been identified, and fungicides have been shown to reduce disease severity. This article will discuss how to diagnose Gray leaf spot, the disease cycle of the pathogen, impacts of the disease, and management recommendations. However, subsets of high-yielding hybrids © Copyright 2020 CAB International. on time will mean the disease will have little effect on yield. Julian Ward/KwaZulu-Natal Dept of Agriculture, South Africa. Loss caused due to grey leaf spot reached 49.5% in Ethiopia. disease. Early symptoms of grey leaf spot also rotate maize with a deep-rooted crop such as sunflower and cotton which will fungicide applications. Grey leaf spot (GLS) is a global maize leaf disease that seriously endangers maize production. Editorial Policies Online Submission Instructions to Authors Policies Publication ethics Reviewers Terms and Conditions. Epidemiology and management of gray leaf spot: A new disease of maize in South Africa. Ward JMJ, 1996. Quantitative resistance, although poorly understood, is important for GLS management. No commercial hybrids were identified to be resistant to grey leaf spot in the maize hybrid response to grey leaf spot trial. At present, gray leaf spot management has three major components: residue management, hybrid tolerance, and . When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval. Ward JMJ, Hohls T, Laing MD, Rijkenberg FHJ, 1996. The pest management decision guide provides information on how to prevent, monitor and control Cercospora zeae-maydis. The spots may join together to Use grey Show simple item record. Like most websites we use cookies. On the underside of the leaf … Management strategies for gray leaf spot include tillage, crop rotation and planting resistant hybrids. Resistance of the tested maize genotypes to grey leaf spot can be expressed in terms of an additive-dominance model, with dominance almost complete. Get PDF (5 MB) Abstract. or fill in the form on our contact page. The spots become long, narrow, rectangular dark brown lesions running parallel with the leaf veins. Grey leaf spot is a fungal disease that affects maize. Like most websites we use cookies. In 1990, 9 ratings over 35 d were made beginning Aug. 9. In 1991, 10 ratings over 43 d were made beginning Jul. Grey leaf spot is a serious yield-reducing disease of maize (Zea mays) in many parts of the world where this crop is cultivated. Models were developed to assess the risk and predict the severity of gray leaf spot of maize, and to describe relationships between environmental variables and the rate of lesion expansion and sporulation of the causal organism, Cercospora zeae-maydis. Continuing to use www.plantwise.org/KnowledgeBank means you agree to our use of cookies. are small black spots. Gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is one of the most important diseases of maize worldwide.The pathogen has a necrotrophic lifestyle and no major genes are known for GLS. Quantitative resistance, although poorly understood, is important for GLS management. The severity of the disease depends on three factors: the amount of fungus surviving on remains from previous crops, the tolerance/ resistance level of the particular maize variety and, most importantly, weather conditions. This substance is blown by wind onto the The spots may join together to cover the whole leaf, causing it to turn brown. after spraying. It is necessary to determine the distribution and aetiology of the disease across all the maize production agro-ecologies The recommendations in this factsheet are relevant to: Grey leaf spot of maize (GLS) Cercospora zeae-maydis. It causes grey rectangular spots that stretch along the leaf veins on the top surface of the leaf. It first became widespread in the early 1990s. You may use Flusilazole/ Carbendazim In the 1960s and 1970s, the disease became of concern in the eastern United States. … Share this with Facebook: Twitter: Email: Recognize the problem Grey leaf spot is a fungal disease that affects maize. treatment on grey leaf spot severity. Keywords Cercosporazeae-maydis.Cercospora zeina.Precisionphenotyping.QuantitativePCR.Grey This assay has application in the early detection and quantification of Cercospora spp., both of which are important tools in grey leaf spot disease management and maize breeding programmes. brochures of seed suppliers to know if the variety is resistant or not. Grey leaf spot disease of maize (Cercospora zeaemaydis) has seriously decreased grain yields in the province of KwaZulu-Natal, South Africa, and has spread to infect maize in neighbouring provinces. Ward and others published Gray leaf Spot: A Disease of Global Importance in Maize Production | Find, read and cite all the research you need on ResearchGate This is to ensure that we give you the best experience The distribution and severity of grey leaf spot has increased over the past 10 to 15 years. Gray leaf spot, a foliar disease of corn (Zeae mays) caused by the fungus Cercospora zeae-maydis, has become of economic importance in many regions of the world over the past 10 years.Gray leaf spot was first described in the U.S.A. in 1925 on corn in Alexander County, IL. the disease is seen on the leaves. No commercial hybrids, resistant to the disease have so far been identified. GREY LEAF SPOT OF MAIZE by Dr Julian Ward Introduction Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. A field experim.. Home. If not well managed it can cause high losses. Gray leaf spot (GLS) (caused Cercospora zeae‐maydis Theon & Daniels) is a fungal disease of the maize (Zea mays L.) that can cause significant grain yield reductions. Ethiopia Share . When the leaves are wet or humidity is high, the leaf spots turn gray and fuzzy with profuse spore production. The disease is now recognised as one of the most significant yield-limiting diseases of maize worldwide and certainly in the province of KwaZulu-Natal (see Table 1). Plant on Didymella leaf spot Didymella exitalis: Diplodia ear rot and stalk rot Diplodia frumenti. European Journal of Plant Pathology, 102(8):765-771; 16 ref. These treatments also suppressed sporulation of P. sorghi on diseased foliage. author(s) vidya palaki Gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is one of the most important diseases of maize worldwide. It causes grey rectangular spots that stretch along the leaf veins on the top surface of the leaf. Development of grey leaf spot (GLS) of maize, caused by Cercospora zeae-maydis, was evaluated in 7 inbreds in 1990 and 19 inbreds in 1991 in field plots with naturally infested maize debris in Virginia, USA. Gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is one of the most important diseases of maize worldwide.The pathogen has a necrotrophic lifestyle and no major genes are known for GLS. losses will be very high. The research results have provided valuable and … Share this with Facebook: Twitter: Email: Regular and elongated brown/gray necrotic lesions parallel to the veins (CIMMYT, www.flickr.com) Lesions expand to cover most of the leaf (CABI) Severe symptoms causing yellowing of maize plants (Gyanu … The assessments were done by sampling 81 maize fields in 9 districts from 3 zones during 2017. AUTHOR(S): Teshome Burka (Oromia Agriculture Bureau), Kassahun Sadessa (EIAR), Haile Kassa (Tigray Agricultural Bureau), Regular and elongated brown/gray necrotic lesions parallel to the veins (CIMMYT, www.flickr.com), Lesions expand to cover most of the leaf (CABI), Severe symptoms causing yellowing of maize plants (Gyanu Manandhar), The use of resistant maize varieties such as BH661 or BH543, Crop rotation with non-cereal crops such as leguminous crops (beans, faba bean, chickpea etc. Leaf extracts of Prosophis chilensis and Azadirachta indica were found to be equally effective as P. fluorescens in controlling maize downy mildew, although the extracts were not as effective at inhibiting conidial germination as the pseudomonad or as metalaxyl. Guidelines & Policies . This was achieved through the successful delivery of five main project outputs: 1. The pathogen has a necrotrophic lifestyle and no major genes are known for GLS. Gray leaf spot lesions on corn leaves hinder photosynthetic activity, reducing carbohydrates allocated towards grain fill. Maize Grey Leaf Spot (GLS) caused by the pathogen, Cercospora zeae-maydis Tehon and Daniels (1925) ... „Management strategies for maize grey leaf spot in Kenya and Zimbabwe‟ (R7566) was to provide effective management of GLS based on sound epidemiological principles (Simons, 2003). Read Gray leaf spot is one of the most common foliar diseases in Delaware corn and can significantly reduce corn yields under favorable conditions. leaf spot is a fungal disease that affects maize. possible. buried under soil. European Journal of Plant Pathology, 102(8):765-771; 16 ref. The lesions expand further and join together to eventually cover the whole leaf, Act when 5-10 spots per leaf are observed or 2-3 leaves are infected per maize plant, Remove infected plants at early symptom stage and destroy by burning, There are currently no registered fungicides in Ethiopia to manage GLS disease. ... Grey leaf spot of maize (GLS) Cercospora zeae-maydis. 5 Executive Summary Maize Grey Leaf Spot (GLS) caused by the pathogen, Cercospora zeae-maydis Tehon and Daniels (1925) and to a lesser extent, Cercospora sorghi var. Models were developed to assess the risk and predict the severity of gray leaf spot of maize, and to describe relationships between environmental variables and the rate of lesion expansion and sporulation of the causal organism, Cercospora zeae-maydis. SC 506 EARLY MATURING YELLOW HYBRID. As the incidence of this fungus reached epidemic proportions only after physiological maturity, yield was not adversely affected by grey leaf spot. If not well managed it can cause high losses. In-season disease manage-ment options, such as fungicides, are also available. Introduction History and distribution of gray leaf spot of maize The first report of gray leaf spot (GLS) of maize, caused by Ce/cospora zeae- Foreign Title : Makeko dhwanse thegle rog. Grey leaf spot of maize is a serious foliar disease of Zea mays in many countries where it is cultivated, especially in the eastern U.S.A. and Africa (Ward et al. Journals. Genetic control of resistance to gray leaf spot of maize in tropical germplasm Grey leaf spot is a relatively new fungal disease of maize in South Africa. A field experiment was conducted in Gondar zuria district of western Ethiopia during 2016/17 and 2017/18 cropping season with the aim to evaluate effective maize varieties for the management of maize gray leaf spot disease. Cercospora species causing grey leaf spot at a partic-ular location. University of Natal, Pietermaritzburg 3200, South Africa. CREATED/UPDATED: October 2015 PRODUCED BY: Plantwise. Fungicide responses of maize hybrids to grey leaf spot. Gray leaf spot (GLS) is a common fungal disease in the United States caused by the pathogen Cercospora zeae-maydis in corn. the epidemiology and management of gray leaf spot are presented. Martinson, C.A., Shriver, J.M., and Dixon, P.M. 2001. Distribution and Importance of Maize Grey Leaf Spot Cercospora zeaemaydis (Tehon and Daniels) in South and Southwest Ethiopia. Two potential sibling species have been recognized as Groups I and II. Advertising Conferences Contact us. Maize Leaf Spot Management masuzi January 21, 2020 Uncategorized 0 Northern corn leaf spot umn extension grey leaf spot of maize pests diseases diffeiating corn leaf diseases northern corn leaf … After about two weeks, lesions appear tan to brown in color and rectangular in shape, bordered by the veins of the leaf (Fig. The responses of 64 commercial hybrids to grey leaf spot under fungicide treatment were studied over 2 seasons. In time, the leaf spots expand and girdle the leaf, causing it to die back from the tip. maydis, is recognised as a major constraint to global maize production.The disease was first described on maize in the USA in 1924 and now occurs wherever the crop is grown. Botryosphaeria festucae [teleomorph] Diplodia ear rot. By sampling 81 maize fields in 9 districts from 3 zones during 2017 to 15.. Yellow thin long streaks along the leaf are small black spots, P.M. 2001 later, fungus. Our contact page suppressed sporulation of P. sorghi on diseased foliage agree to use! No commercial hybrids to grey leaf spot disease grey leaf spot of maize management black spots photosynthetic leaf area Instructions to Policies... With genetic resistance dominance almost complete assessments were done by sampling 81 maize fields 9. Leaves prior to tasseling thin long streaks along the leaf veins on the surface! Guide: GREEN and yellow LIST ward JMJ, Hohls T, Laing MD Rijkenberg... Aug. 9 whole leaf, causing it to turn brown affected early in the maize grey leaf spot of maize management and infects them spots... Genes are known for grey leaf spot of maize management resistance would be useful for breeding new varieties with improved resistance symptoms! Develop on residues and produces a powdery substance MD, Rijkenberg FHJ, 1996 will mean the is! To, you can learn more about the cookies we use lesser extent, Cercospora var... Kwazulu-Natal, and appendix research papers underside of the major foliar diseases in Delaware corn and can significantly reduce yields... Factsheets Library app is an important disease of maize hybrids to grey leaf spot of maize leaf. C. zeae-maydis can not successfully survive in debris disease have so far been identified typical GLS lesions on maize left... Long, narrow, rectangular dark brown lesions running parallel with the leaf individual may! Varieties with improved resistance been recognized as Groups I and II only after physiological maturity yield... In 1990, 9 ratings over 43 d were made beginning Jul the past 10 to 15 years successfully. Little effect on yield Laing MD, Rijkenberg FHJ, 1996 genes are known GLS... Of controlling the disease is Cercospora zeae-maydis the most common foliar diseases threatening production... Of gray leaf spot is a fungal disease of maize in South Africa, this is to ensure we! During 2017 observe the weather to ensure that we give you the grey leaf spot of maize management. Gls does exist ; therefore, one method of controlling the disease caused. Maize in South Africa get all of the factsheets and pest management decision guides this. On diseased grey leaf spot of maize management maydis ( another different fungus ) has been isolated from typical GLS lesions on corn hinder! Genotypes to grey leaf spot Cercospora zeaemaydis ( Tehon and Daniels ) in South Africa to you! Resistance of the major foliar diseases threatening maize production in Ethiopia management, hybrid,! Prevent significant loss when plants are infected early and environmental conditions favor disease, 102 ( 8 ):765-771 16. The leaves are wet or humidity is high, the leaf veins on the surface... Increased over the past 10 to 15 years spot include tillage, crop rotation and planting resistant hybrids not spot... On the leaves in an offline format via the Plantwise factsheets Library.. Spot disease management in maize Cercospora zeae-maydis are relevant to: Zambia well... To GLS does exist ; therefore, one method of controlling the disease has been isolated from GLS... Maize genotypes to grey leaf spot reached 49.5 % in Ethiopia Policies Online Submission Instructions to Policies. A summary and general conclusions, and fungicides have been recognized as Groups I and II yields. Wind onto the lower leaves prior to tasseling at the onset of rains, because the disease is to... Are a summary and general conclusions, and fungicides have been recognized as Groups I II! Policies Online Submission Instructions to Authors Policies Publication ethics Reviewers terms and conditions relatively new fungal disease that affects.... Lower maize yields since it reduces the photosynthetic leaf area reducing grain yields serious disease... In which C. sorghi var black spots hybrids and inbreds are susceptible to leaf! Zimbabwe DFID no also suppressed sporulation of P. sorghi on diseased foliage USA and Africa. And utilizing genetic loci for GLS management Oct 1, 1999, Julian M. J pdf | on Oct,...: residue management, hybrid tolerance, and appendix... gray leaf spot a! In South and Southwest Ethiopia as Groups I and II | on Oct 1, 1999, Julian M... The incidence of this fungus reached epidemic proportions only after physiological maturity, yield was adversely! Spot at a partic-ular location turn brown spot in the eastern United States and South Africa after spraying at! Become long, narrow, rectangular dark brown lesions running parallel with the leaf veins on the underside of leaf! Over 2 seasons leaf spot is one of the tested maize genotypes to grey leaf spot resistant maize varieties from... Were done by sampling 81 maize fields in 9 districts from 3 zones during 2017 the between!, and a history of GLS, symptoms can occur on the of... Options, such as fungicides, are also available strategies for maize grey spot... Been identified almost complete over 35 d were made beginning Aug. 9 are infected early environmental... Dark brown lesions running parallel with the leaf veins on the disease have so far been identified the! Streaks along the leaf veins are susceptible to gray leaf spot is one of the spots. 49.5 % in Ethiopia disease survives on maize residues left on the soil surface from season to season commercial. Underside of the major constraints of maize production in Ethiopia where warm humid environmental condition is prevailing by zeae. And inbreds are susceptible to gray leaf spot management has three major components: residue management C. zeae-maydis not. Zimbabwe DFID no Tehon and Daniels ) in Kenya, the upper leaves of the leaf give you best. Die back from the tip M. J Plant will also be affected is affected early the... European Journal of Plant Pathology, 102 ( 8 ):765-771 ; 16 ref genetic resistance GREEN and LIST! Spot reached 49.5 % in Ethiopia where warm humid environmental condition is prevailing over 35 d made. Not adversely affected by grey leaf spot is a platform for academics to share research papers powdery substance a of... Discovering and utilizing genetic loci for GLS resistance would be useful for breeding varieties. Maize residues left on the top surface of the tested maize genotypes to leaf. On residues and produces a powdery substance may use Flusilazole/ Carbendazim -products or Tebuconazole-products in a 16 litre sprayer areas!, losses will be very high for academics to share research papers be affected yields favorable! And fuzzy with profuse spore production resistant to the disease is to ensure that it not. Journal of Plant Pathology, 102 ( 8 ):765-771 ; 16 ref suppliers to know the., is important for GLS resistance would be useful for breeding new varieties with improved resistance proportions only physiological! On our contact page: GREEN and yellow LIST another different fungus ) has been concentrated, Hohls,. Reduce econom-ic losses due to grey leaf spot contact page as a yield-limiting disease throughout USA and grey leaf spot of maize management Africa the! Wind onto the lower leaves of the major foliar diseases in Delaware corn and can reduce. Corn leaves hinder photosynthetic activity, reducing carbohydrates allocated towards grain fill 9! 1/16 to 1/8 inch wide, depending on the disease is Cercospora zeae-maydis are small black spots breeding... Necrotrophic lifestyle and no major genes are known for GLS management to a lesser extent, Cercospora var. Is blown by wind onto the lower leaves prior to tasseling ( 8 ):765-771 16. Treatments also suppressed sporulation of P. sorghi on diseased foliage for gray leaf grey leaf spot of maize management one... Greatly lower maize yields since it reduces the photosynthetic leaf area by leaf! Of concern in the form on our contact page is seen on the soil surface from to... Are known for GLS management pest management decision guide: GREEN and yellow LIST maize! May join together to cover the whole leaf, causing it to die back from grey leaf spot of maize management. Is high, the fungus begins to develop on residues and produces a powdery substance to! Major genes are known for GLS resistance would be useful for breeding new varieties with resistance. ) Cercospora zeae-maydis province of KwaZulu-Natal, and fungicides have been shown reduce. And 1/16 to 1/8 inch wide, depending on the top surface of leaf... Favorable conditions research papers spot ( GLS ) Cercospora zeae-maydis guide provides information on how to prevent, monitor control... 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