Ecology, Environment and Conservation Paper

MANAGEMENT OF DOWNY MILDEW OF CUCUMBER BYLOWERING TOXIC FUNGICIDE APPLICATIONS

S.B. Chavan, S.N. Hasabnis, M. B. Kadam and A.V. Bhong

Abstract

The results for management of downy mildew disease of cucumber revealed that the integration of treatmentsof fungicide and nutrients were more effective as compared to sole applications of fungicide, nutrients andcombination treatments of different nutrients. The average infection rate was observed less in treatment T5(metalaxyl 4 % + mancozeb 64 % WP and potassium salt of active phosphorus sprayed alternatively). Thedisease progress curve revealed that the disease intensity was not uniform. The maximum disease progresscurve value was observed in the treatment T11 (absolute control) and the lowest AUDPC value was observedin treatment T5 than any other treatment. None of the attempted treatment showed any kind of phytotoxicityon plant parts of cucumber crop. The alternate spraying of fungicide (metalaxyl 4 % + mancozeb 64 % WP)and PSAP, i.e. treatment T5 found effective over all other treatments during successive four observationsand recorded 68.75, 64.89, 63.67 and 66.46 per cent downy mildew disease control during third, fourth, fifthand sixth observation, respectively. The alternate spraying of fungicide (metalaxyl 4 % + mancozeb 64 %WP) and chitosan, i.e. treatment T3 found the second best treatment to lower downy mildew disease for allobservations except first and second observation.