Population Dynamics of Leafhopper Emposca (Distantasca) Terminalis and Its Effect on Yard Long Bean Vigna Unguiculata Subsp. Sesquipedalis

The investigation was carried out to know the population dynamics of the leafhopper population on yard long bean Vigna unguiculata subsp. sesquipedalis during kharif 2018 and rabi 2018–19 at AHRS, Bhavikere, UAHS, Shivamogga, Karnataka. The short duration yard long bean variety Arka Mangala was found infested with many sucking pests at various stages of crop growth. Of these, leafhopper Emposca (Distantasca) terminalis was the major one causing yield loss. Its incidence was noticed throughout the cropping period, and ranged from 1.10 to 5.41 leafhoppers/ leaf (kharif) and 0.27 to 4.23 leafhoppers/ leaf (rabi). During kharif, the incidence was significantly and positively correlated with the maximum and minimum temperature; and rainfall, maximum and minimum relative humidity (RH) showed a significant negative correlation. During rabi, incidence was found to be significantly and positively correlated with the maximum and minimum temperature, rainfall and minimum RH; and maximum RH showed a non- significant negative correlation.