Corn earworm in grain sorghum phosdrin and thiodan: Show promise as substitutes for DDT in two experiments with aerial applications to infested fields

Abstract

Damage to grain sorghum by the corn earworm–Heliothis zea (Boddie) –has been especially severe in Butte and Glenn counties. Certain fields examined in 1957 and 1958 showed 90%-99% of the heads to be infested. Usually 1–4 larvae per head were found although some heads had 10-16 larvae.