Soybean Stem Canker Incited by Isolates ofDiaportheandPhomopsisspp. from Cotton in Mississippi

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Abstract
Isolates of Diaporthe and Phomopsis spp. from cotton (G. hirsutum) leaves and seedlings were inoculated into soybean (G. max) stems in the field by using a stem-puncture technique. All isolates incited cankers by the 8th wk after inoculation. Isolates differed in virulence on soybean. Girdling and nongirdling cankers 0.5-12.6 cm long, internal stem necrosis, interveinal necrosis of leaves and killing of plants were associated with infection by these isolates. Plants inoculated with D. phaseolorum var. caulivora from soybean exhibited similar symptoms. Cotton may serve as a source of inoculum for these fungi, which are potentially capable of inciting stem canker of soybean.

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