Abstract

Seasonal incidence of Micromus igorotus (Banks) was studied at ARS Honnavile (Shimoga taluk), Sugarcane Development Research Station MPM, Karehalli (Bhadravathi taluk) and ARS Kathalagere (Davanagere taluk). The results revealed that an incidence ranging from 0.00 to 7.72 nymph per plant at Honnavile, Shimoga taluk, 0.00 to 7.25 at SRDC, MPM, Bhadravathi taluk and 0.00 to 13.9 at Kathalagere, Davanagere district. The high incidences of 7.72, 7.25 and 13.9 nymph per plant were observed during September, June and August months, respectively. The lowest incidence of 0.00 nymph per plant was observed during November to February months at Honnavile and Karehalli and December to January in Kathalagere respectively, due to rainfall received during that period in all the locations. In relation to weather parameters showed that there is two peaks in the year in May and September. Further M. igorotus population was negatively correlated with minimum temperature, maximum temperature, relative humidity and rainfall at all the three locations and positively correlated with relative humidity.

Keywords: Micromus igorotus, brown lacewing, sugarcane woolly aphid, seasonal incidence, relative humidity, temperature and rainfall.