First Report of Charcoal Rot Epidemics Caused by Macrophomina phaseolina in Soybean in Iowa

Plant Disease
X B Yang, S S Navi

Abstract

Macrophomina phaseolina, the causal agent of soybean charcoal rot, is widely present in soil and has been reported to cause yield losses of 30 to 50%, mainly in southern soybean production regions of the United States. (2). Charcoal rot was first reported in North Dakota during 2002, suggesting a range expansion for M. phaseolina (1). Charcoal rot has been occasionally observed in Iowa in individual soybean plants, but epidemics of the disease have not been recorded. During the 2003 growing season, a severe epidemic of charcoal rot was observed throughout the state. Diseased plants were first noticed in late July and by late August, patches of diseased plants wilted and died prematurely in many fields. The pith of diseased plants had a brown discoloration in taproots and lower stems. Symptoms were observed up to the 4th or 5th nodes, typical of charcoal rot. In some plants, no discoloration was evident. In discolored plants, microsclerotia of M. phaseolina were commonly observed in the epidermis, just beneath the epidermis, and inside taproots and lower stems of wilted plants. A systematic survey was conducted between late August and early September, 2003 to determine the prevalence and severity of charcoal rot in Iowa. The dis...Continue Reading

Citations

Jan 20, 2012·Critical Reviews in Microbiology·Surinder KaurVijay Bahadur Chauhan
Mar 13, 2014·International Journal of Biometeorology·L M ManiciM Donatelli
Sep 1, 2011·Plant Disease·Alemu MengistuN Bellaloui

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