OBSERVATIONS ON HIBERNATION OF CUTWORMS, AGROTIS-SEGETUM SCHIFF (LEP,NOCTUIDAE)

The vertical position and the mortality of hibernating cutworms (Agrot is segetum) were investigated using sampled larvae released in small h ibernation plots in the field. The results show that the larvae hibern ate in a position 3-7 cm below the soil surface. Some specimens may st ay as deep as 10-14 cm. After hibernation the larvae move to a pupatio n position at 1-3 cm's depth. The larvae seem to hibernate successfull y with moderate mortality in cold as well as mild winters. A high leve l of mortality from an insect pathogen was recorded in one case.