Buckeye rot of tomato caused by Phytophthora capsici in Michoacan, Mexico

Buckeye rot of tomato caused by Phytophthora capsici in Michoacan, Mexico

2003

A:PS

Field-grown tomato plants with infected green fruits were observed in Michoacan, Mexico, in August 2002. Initially, brown-to-black lesions developed on fruits in contact with the soil, followed by infection of the upper fruits in the raceme. Lesions enlarged and dark zonate "buckeye" bands were formed in the affected area. Infected fruits turned mushy. Mycelia were transferred to PARP selective medium (maize meal agar (MMA) plus ampicillin, pimaricin, rifampicin, and pentachloronitrobenzene). P. capsici was consistently isolated from infected tomato fruits. Oomycete identification was based on sporangial and gametangial characteristics of cultures grown on MMA. Upon conducting pathogenicity tests, symptoms observed were similar to those in field-grown plants, and P. capsici was recovered from the margins of the infected tissue. This is thought to be the first report of P. capsici causing buckeye rot on tomato in Michoacan and of the presence of both mating types in the area.

v.87(7):872, PLANT DISEASE

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