Euzophera ostricolorella Hulst (Lepidoptera: Pyralidae) was first described as a serious pest in 1954 when it caused heavy losses in yellow-poplar, Liriodendron tulipifera L., woodlots in Kentucky and Tennessee. The borer now damages shade trees and seed orchards in Tennessee. In 1977 the borer was bivoltine in East Tennessee. Adults of the overwintering brood emerged from April 27 to June 8 and adults of the summer brood emerged from August 27 to October 10. The average incubation period of the eggs was 9 days and the pupal period was 18 days. The major larval parasites of the borer were Venturia nigricoxalis Vier. and Macrocentrus delicatus Cress. The parasitism rate was 18% and 36% respectively, for the overwin-tering and summer broods. The two most effective borer control treatments were:(1) paradichlorobenzene placed around the base of the tree and covered with a six inch mound of sawdust, and (2) lindane-oil solution sprayed into a six inch mound of sawdust placed around the base of the tree
