tomato early blight alternaria treatment

Conidia, chlamydospores and mycelium of A. Under field conditions, symptoms of early blight occur on fruit, stem and foliage. The symptoms of the disease appears on leaves, stems, petiole, twig and fruits under favourable conditions resulting in defoliation, drying off of twigs and premature fruit drop and thus causing loss from 50 to 86 per cent in fruit yield ( Mathur and Shekhawat, 1986). The causal organism is air borne, soil inhabiting and is responsible for early blight, collar rot and fruit rot of tomato ( Datar and Mayee, 1981). solani.Įarly blight also known as target spot disease incited by Alternaria solani (Ellis and Martin) Jones and Grout, is one of the world’s most catastrophic disease in tomato crop. Marigold intercropping and plastic mulching served successfully as physical barrier against conidial dissemination to diminish significantly the tomato foliar damage produced by A. When intercropped with tomato, marigold served as barrier to conidial movement and plastic mulching prevented evapotranspiration and reduced the canopy RH that resulted in less germination of A. Tomato-marigold intercropping–plastic mulching treatment (T + M + P) showed 35–39% reduction in disease intensity as compared to tomato alone. solani conidial density, tomato leaf damage and microclimatic parameters as compar to tomato alone (T). We evaluated effect of marigold intercropping and plastic mulching singly and in consortia on A.

The objective of the study was to modify microclimatic conditions of tomato crop canopy which may hamper conidial dispersal and reduce disease severity. High night temperature positively correlated and significantly ( P < 0.01) involved in conidial spore dispersal and low relative humidity (RH) displayed significant ( P < 0.05) but negative correlation with conidial dispersal. Macroclimatic study reveals that highest inoculum concentration of Alternaria spores appeared in May 2012 to 2013 and lowest concentration during January 2012 to 2013.

The conidia survive on soil surface and old dry lower leaves of the plant and spread when suitable climatic conditions are available. Early blight of tomato caused by Alternaria solani, is responsible for severe yield losses in tomato.

Tomato early blight alternaria treatment