are splashed or wind-blown to upper leaves or to other plants. Turcicum leaf blight is ubiquitous in hill environments and can cause severe losses if the variety does not have good genetic resistance. Author Summary Gray leaf spot (GLS), a necrotrophic, foliar fungal disease of maize, contributes to maize yield losses worldwide. Until the middle oft the 90s leaf blight of maize was considered to be a problem of warm humid maize growing areas as in our neighbouring countries in the south and overseas. Gray leaf spot (GLS) is an important and destructive disease of maize in the hills of Nepal. We identified and characterized regions of the maize genome that confer resistance to GLS and gained insight into the mechanisms associated with these quantitative trait loci (QTL). Older lesions produce black spots called pycnidia, which are spore-producing fungal structures. The spots may occur in bands across the leaf blade. We provide evidence for structural and detoxification-related mechanisms … GREY LEAF SPOT OF MAIZE by Dr Julian Ward Introduction Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. FRONTISPIECE : GREY LEAF SPOT IN MAIZE . The local maize breeders could now incorporate the genes for GLS resistance in CML 373 and TZMI 711 and the grain yield genes in CML 384 into elite lines using recurrent and backcross methods, respectively in order to increase maize production and productivity in Kenya. Keywords: Gray leaf spot, Grey leaf spot, GLS, Cercospora, QTL, Maize, Corn Background Gray leaf spot (GLS) is a foliar disease of maize that was highlighted as a threat to maize production in the USA in the 1980s [1], reported in South Africa in the 1990s [2], and currently has a worldwide distribution in maize Brown spot lesion s fir st appear as very small, rou nd-to-ob long, y ellowish spots on the leaf blade (Figure 1) , leaf she ath (Figu re 2), st alk, and r arely on the husks and tassel of the outer ear. Dark-purple, round spots may also occur on leaf sheaths, stalk, and sometimes on the outer ear husks and tassels of maize Management and Control 1. It has become well established in the province of KwaZulu-Natal, and is capable of reducing grain yields by 20 to 60%. Northern Corn Leaf Blight Purdue extension lesions, and fewer fungal spores. Diplodia Leaf Streak (Stenocarpella macrospora) SyMptoMS: Symptoms of Diplodia leaf streak can occur on all leaves including the ear leaves. The disease is spreading to neighbouring provinces and NCLB lesions may also appear on the leaf sheaths and husks of susceptible hybrids. 1. Figure 2. On hybrids with race-specific resistance, lesions are small and yellow and produce no spores (Figure 4). Similaarly, gray leaf spot disease is emerging as problematic during rainy Grow Seed Co tolerant hybrids 2. Holcus leaf spot is not known to spread from infected leaves to healthy leaves, and lesions are typically larger than lesions caused by Curvularia leaf spot. Not only is it a threat to maize Lesions are large (up to 10 cm long), gray-green and elliptical with a water-soaked appearance. Symptoms of eyespot are very similar to Curvularia leaf spot symptoms. The occurrence of this disease is recorded for the first time in the country in 2006. See University of Kentucky Extension Publication, Holcus Leaf Spot (PPFS-AG-C-06), for more information. ABSTRACT Grey leaf spot is a relatively new fungal disease of maize in South Africa. Maize (Zea mays L.) is one of the important food crops for human and animal in Egypt as well as in the world. Banded leaf and sheath blight (Rhizoctonia solani) was increasing in severity and prevalence in all environments. 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). Key words: Maize, Zea mays, grey leaf spot, grain yield, combining ability. Lesions start as small yellowish spots that latter turn dark-purple to black, oval spots usually occur on the midribs of leaves 2. Infected tissues tur n a choc olate br own to re ddish Hill environments and can cause severe losses if the variety does not have good genetic.! 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