Buckeye Rot of Tomato Caused by Phytophthora capsici in Michoacan, Mexico

Plant Disease
S P Fernández-PavíaJ M Sánchez-Yañez

Abstract

The state of Michoacan is one of the main fresh pepper (Capsicum annuum L.) and tomato (Lycopersicon esculentum Mill.) producers in Mexico. During the last 5 years, pepper-producing areas in the state have become unproductive due to root-rotting pathogens, mainly Phytophthora capsici Leonian. Growers trying to overcome losses have increased tomato production in areas previously used for pepper production. Field-grown tomato plants with diseased green tomato fruits were observed in Tacambaro, Michoacan, during August 2002. Initially, brown-to-black lesions developed on fruits in contact with soil, followed by infection of the upper fruits in the raceme. Lesions enlarged and dark zonate "buckeye" bands were formed in the affected area. Diseased fruit turned mushy. Symptoms observed were similar to those described for buckeye rot of tomato (1). Diseased fruit were surface disinfested with 70% ethanol, cut into 0.5-cm slices, and incubated in a moist chamber to induce mycelial colonization. Isolation from mycelial tufts growing through the tomato slice was performed 3 days later, and mycelia was transferred to PARP selective medium (corn meal agar (CMA) plus ampicillin, pimaricin, rifampicin, and pentachloronitrobenzene). P. capsic...Continue Reading

Citations

Oct 24, 2008·Phytopathology·O Hurtado-GonzálesK Lamour

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