Control of the 28 spotted lady beetle, Epilachna vigintioctopunctata Fabricius on potatoes by soil application of Disyston

Abstract

In the warm region of Japan, the 28 spotted lady beetle is the most destructive insect pest of potatoes. Effect on this beetle of Disyston applied in soil to control the aphids as vector of the potato leaf roll virus was examined.
One gram of 5% Disyston granular per piece of seed potatoes, 66 kg per hectare, was app-lied in soil with fertilizer at planting time.
This dose reduced not only occurrence of the leaf roll but also the 28 spotted lady beetle remarkably.