Population abundance and eco-friendly management of tomato fruit borer, Helicoverpa armigera Hb. on tomato under West Bengal conditions

摘要

The larval population of tomato fruit borer, H. armigera first appeared in the field during 3rd standard metrological week (SMW) which gradually increased and reached its peak (7.37 larvae per plant) during 12th SMW i.e. on 21.3.16. Correlation between various abiotic factors viz., maximum relative humidity (r = -0.38), minimum relative humidity (r = -0.21) and rainfall (r = -0.33) with fruit borer larval population was found to be negative where as maximum temperature (r = 0.88), minimum temperature(r = 0.86) and sunshine hour (r = 0.34) were positively correlated with H. armigera larval population. Application of Beauveria bassiana 1.50% LF (Bio-Power) at three different doses along with neem and quinalphos revealed that upto 80% pest mortality over untreated control can be obtained when Beauveria bassiana 1.50% LF was applied @ 4000 ml/ha.