MANAGEMENT OF TOMATO EARLY BLIGHT, CAUSED BY Alternaria solani WITH RESISTANCE INDUCER CHEMICALS (RIC) AND FUNGICIDES

Document Type : Research articles.

Author

Agric. Botany Dept., Fac. Agric., Fayoum University

Abstract

The resistance inducer chemicals (RIC), i.e. Bion, Cobalt
chloride, Ecophote, Photophor and Salicylic acid and the two
fungicides; i.e. Concento and Score used in this investigation caused
different degrees of inhibition to the radial growth of Alternaria
solani, the causal fungus of tomato early blight. In general, both of
the two aforementioned fungicides were more effective than RIC in
reducing the radial growth of A. cucumerinum. Also, the reduction
in the radial growth increased by increasing the concentration of
both the tested RIC and fungicides. Field experiments curried out
during 2011 and 2012 growing seasons revealed that both of the
tested RIC and fungicides resulted in significant reduction in the
natural infection of tomato early blight consequently fruit yield was
increased compared with control treatment. On the otherhand,
spraying RIC after application of the aforementioned two fungicides
was more effective in reducing the disease severity compared with
spraying the fungicides or RIC each alone. All applications of RIC
and fungicides, each alone resulted in considerable increase to
oxidative-reductive enzymes; i.e. polyphenol oxidase, peroxidase
and ascorbic acid oxidase compared with control treatment.
However, RIC increased enzymatic activity compared with the two
tested fungicides.

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