Epidemiology and management of premature fruit drop of Kinnow.

摘要

A relationship between weather parameters and premature fruit drop of Kinnow (Citrus reticulata) caused by Colletotrichum gloeosporioides was studied and different fungicides were evaluated in laboratory and field for managing this disease. A definite relationship was observed between premature fruit drop of Kinnow and the prevailing temperature, relative humidity and rainfall patterns. All these weather parameters were found positively correlated with the premature fruit drop for two experimental years 2006 and 2007. Regression analysis showed 94.7 and 96.4% influence of weather parameters on the prevalence of the disease in 2006 and 2007, respectively. Most systemic and non-systemic fungicides inhibited mycelia growth of C. gloeosporioides in vitro. Systemic fungicides viz., carbendazim, difenoconazol and non-systemic viz., propineb inhibited maximum fungal growth under in vitro. In two consecutive years of field experiments all tested systemic and non-systemic fungicides reduced the incidence of premature fruit drop of Kinnow. Under field condition also, carbendazim, difenoconazole and propineb provided maximum disease control ranging from 80.5 to 82.5%.