Southern corn leaf blight is caused by the fungus Bipolaris maydis, which primarily follows an asexual disease cycle. Southern corn leaf blight . The invasion of the Southern Corn Leaf Blight into Indiana during recent weeks has caused great concern. Scientifically, southern corn leaf blight disease represents a fascinating system for the study of fungal toxin action and, in addition, provides us with a unique tool for the Scientific Name. Cochliobolus heterostrophus. Southern corn leaf blight. Some southern states lost more than 50 percent of their corn crop. Southern corn leaf blight, caused by Race T of the fungus Bipolaris (Helminthosporium) maydis, forced US crop breeders to consider the detrimental effects of planting only one genotype of a crop.If the specific genotype used isn’t resistant to a particular invader, then the whole crop could be lost if the pathogen establishes itself in the environment. To view more on Southern Corn Leaf Blight … Compared to NCLB, it develops at warmer temperatures, between 68 to 90o F, and under damp conditions. As it was, the Southern Corn Leaf Blight devastated 15 percent of America's 1970 corn crop, reducing the average national corn yield from 83.9 to 71.7 bushels per acre, costing farmers about $1 billion in losses. The other leaf disease that has been reported to a lesser extent is northern corn leaf blight. Seedlings from infected kernels are often blighted. Common Name. Symptoms of southern corn leaf blight progress into long, oblong, tan or grayish lesions. Here follows background information that may help you assess the situation. Variation in lesion size and shape may occur between inbreds and hybrids with different genetic backgrounds. Southern leaf blight, southern corn leaf blight, southern leaf spot, maydis leaf blight. Under the right conditions, conidia (asexual spores) are released from wounds of a diseased corn plant and dispersed to surrounding plants through splashing rain or wind. Of these diseases, Goss’s wilt can cause significant yield loss on susceptible hybrids in ND. Cochliobolus heterostrophus; this is the name for the sexual stage; the asexual stage is known as Bipolaris maydis (previously it was Drechslera maydis and before that Helminthosporium maydis).There are different races. It seems SOUTHERN CORN LEAF BLIGHT (SCLB) This disease is caused by the fungus Bipolaris maydis. The typical symptoms are oval to slightly elongated lesions, ¼ inch to 1 inch long (Figure 1). Ear infections result in a gray-black lesion on the husk that extends into the kernels, appearing as a black felt-like mold. In 1970 the losses to corn leaf blight approaches 710 million bushels. Other diseases that may be seen include anthracnose leaf blight (caused by a fungus – Colletotrichum graminicola), Northern corn leaf blight (caused by a fungus – Exserohilum turcicum), Southern corn rust (caused by a fungus – Puccinia polysora), and common corn rust (caused by a … Pathology This disease is caused by the fungus pathogen, Helminthosporium maydis. --Herbert H. Kramer Director, Purdue Agricultural Experiment Station 1. Stalk and leaf infections initially appear as purple spots that develop tan-gray centers. Southern corn leaf blight (SCLB), caused by the fungus Cochliobolus heterostrophus (also known as Bipolaris maydis), has been observed at several locations in the Lower Rio Grande Valley in the fall corn crop this past month. Symptoms. Lesions on maize leaves, caused by race O, are elongated between the veins, tan in colour, 2-6 x 3-22 mm long, with limited parallel margins and buff-to-brown borders. 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