INFLUENCE OF WEATHER ON FLIGHT ACTIVITY OF PARASITIC HYMENOPTERA

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Abstract
The influence of temperature, relative humidity, wind velocity, light intensity, and precipitation on the flight activity of diurnal ichneumonids and braconids is discussed. Light rain stimulates flight activity, but light intensity does not affect it. Ichneumonids are most active at moderate temperature, high humidity, and low wind velocity, while braconids are most active at high temperature, low humidity, and low wind velocity. The optimum weather for maximum flight activity coincides with the fact that ichneumonids predominate on forest insect pests, and braconids on agricultural insect pests.