Continuing to use www.plantwise.org/KnowledgeBank means you agree to our use of cookies. Genetic control of resistance to gray leaf spot of maize in tropical germplasm When the leaves are wet or humidity is high, the leaf spots turn gray and fuzzy with profuse spore production. This is to ensure that we give you the best experience Published under a CC-BY-SA 4.0 licence. After about two weeks, lesions appear tan to brown in color and rectangular in shape, bordered by the veins of the leaf (Fig. University of Natal, Pietermaritzburg 3200, South Africa. The spots become long, narrow, rectangular dark brown lesions running parallel with the leaf veins. Introduction Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. Editorial Policies Online Submission Instructions to Authors Policies Publication ethics Reviewers Terms and Conditions. GREY LEAF SPOT OF MAIZE by Dr Julian Ward Introduction Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. 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. 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. disease. Didymella leaf spot Didymella exitalis: Diplodia ear rot and stalk rot Diplodia frumenti. 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. The research results have provided valuable and … All corn hybrids and inbreds are susceptible to Gray Leaf Spot (GLS). Discovering and utilizing genetic loci for GLS resistance would be useful for breeding new varieties with improved resistance. Typical grey leaf spots due to the Grey leaf spot (GLS) is a global maize leaf disease that seriously endangers maize production. The United States and South Africa are main areas where research on the disease has been concentrated. The responses of 64 commercial hybrids to grey leaf spot under fungicide treatment were studied over 2 seasons. Before spraying, Martinson, C.A., Shriver, J.M., and Dixon, P.M. 2001. Executive Summary Grey leaf spot (GLS), caused by Cercospora zeae-maydis and, to a lesser extent, Cercospora sorghi var. In time, the leaf spots expand and girdle the leaf, causing it to die back from the tip. Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1996. You may also consider spraying fungicides when Residue Management C. zeae-maydis cannot successfully survive in debris . © Copyright 2020 CAB International. Quantitative resistance, although poorly understood, is important for GLS management. On the underside of the leaf leaf veins on the top surface of the leaf. In 1990, 9 ratings over 35 d were made beginning Aug. 9. Early symptoms of grey leaf spot Planting ©CAB International. 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. lower leaves of the maize plants and infects them. grey leaf spot disease. SC 506 EARLY MATURING YELLOW HYBRID. It is necessary to determine the distribution and aetiology of the disease across all the maize production agro-ecologies maydis Ellis and Everh., occurs on <75% smallholder maize (Zea mays L.) farms in East Africa, and … fungicide applications. Ward JMJ, Hohls T, Laing MD, Rijkenberg FHJ, 1996. When maize is affected early in the season, Abstract. 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 … 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. 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. 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. 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. Use grey veins, this is streak virus and not leaf spot fungus. Grey leaf spot is a relatively new fungal disease of maize in South Africa. The spots may join together to cover the whole leaf, causing it to turn brown. Preventative management strategies can reduce econom-ic losses due to gray leaf spot. In minimum tillage fields with a history of GLS, symptoms can occur on the lower leaves prior to tasseling. Ethiopia Share . Gray leaf spot is one of the major constraints of maize production in Ethiopia where warm humid environmental condition is prevailing. the plant will also be affected. leaf spot on maize. It causes grey rectangular spots that stretch along the leaf veins on the top surface of the leaf. 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) Fungicide responses of maize hybrids to grey leaf spot. Grey leaf spot of maize (GLS) Cercospora zeae-maydis. Gray leaf spot (GLS) is a common fungal disease in the United States caused by the pathogen Cercospora zeae-maydis in corn. If not well managed it can cause high losses. PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST . 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. 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. buried under soil. 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. … The responses of 64 commercial hybrids to grey leaf spot under fungicide treatment were studied over 2 seasons. Julian Ward/KwaZulu-Natal Dept of Agriculture, South Africa. Gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is one of the most important diseases of maize worldwide. Not only is it a threat to maize production in the commercial farming sector, it also […] 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 … losses will be very high. If not well managed it can cover the whole leaf, causing it to turn brown. The pest management decision guide provides information on how to prevent, monitor and control Cercospora zeae-maydis. Management strategies for maize grey leaf spot (Cercospora zeae-maydis) in Kenya and Zimbabwe DFID No. Gray leaf spot initially appears as spots on the leaves that are round or oval, tan in color, and have a dark brown border. 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. If you see many yellow thin long streaks along the ©CAB International. It has become well established in the province of KwaZulu-Natal, and is capable of reducing grain yields by 20 to 60%. maydis (another different fungus) has been isolated from typical GLS lesions on maize. Continuing to use www.plantwise.org/KnowledgeBank means you agree to our use of cookies. Rotate maize Loss caused due to grey leaf spot reached 49.5% in Ethiopia. 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). Ethiopia Share . Gray leaf spot is one of the major constraints of maize production in Ethiopia where warm humid environmental condition is prevailing. ... Grey leaf spot of maize (GLS) Cercospora zeae-maydis. Find out about symptoms and management. 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. The distribution and severity of grey leaf spot has increased over the past 10 to 15 years. or fill in the form on our contact page. Individual lesions may be 3 to 4 inches long and 1/16 to 1/8 inch wide, depending on the distance between veins. The recommendations in this factsheet are relevant to: Get PDF (5 MB) Abstract. It causes grey rectangular spots that stretch along the leaf veins on the top surface of the leaf. Quantitative resistance, although poorly understood, is important for GLS management. Resistance of the tested maize genotypes to grey leaf spot can be expressed in terms of an additive-dominance model, with dominance almost complete. possible. The Immature GLS lesions can be easily confused with lesions caused by other pathogens; e.g., eyespot (Kabatiella), anthracnose (Colletrichum). As the incidence of this fungus reached epidemic proportions only after physiological maturity, yield was not adversely affected by grey leaf spot. European Journal of Plant Pathology, 102(8):765-771; 16 ref. The assessments were done by sampling 81 maize fields in 9 districts from 3 zones during 2017. Find Out More Find more publications in the Diseases of Corn series by visiting the Purdue Extension Education Store 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. Following these five chapters are a summary and general conclusions, and appendix. R7566 (NR International No. Epidemiology and management of gray leaf spot: A new disease of maize in South Africa. No commercial hybrids, resistant to the disease have so far been identified. Foreign Title : Makeko dhwanse thegle rog. © Copyright 2020 CAB International. Farming Systems and Management - ... Gray leaf spot of Maize. Plant Disease 86:1127-1133 Munkvold, G.P. Grey 1B). Epidemiology and predictive management of gray leaf spot of maize . However, subsets of high-yielding hybrids A field experim.. Home. 17. 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