Abstract
The life history and habits of 3 species of Psilocorsis oak leaftiers were studied in Massachusetts and Missouri. P. quercicella Clemens and/*, cryptolechiella Chambers are bivoltine and have 5 larval stages. P. reflexella Clemens is univoltine with 6 larval stages. Eggs are usually deposited between overlapping leaves or within previously formed leaf ties. All species overwinter as pupae in leaf litter. Adult flight periods and the duration of immature stages were longer in Missouri than in Massachusetts. Larvae are skeletonizers and construct distinct feeding tunnels between leaves tied with silk. White oak was the preferred host. Damage was most prevalent on understory foliage and regions of canopies where foliage density was greatest. Several species of insect parasites and predators are reported for Psilocorsis spp. Additional insect species were collected in leaf ties constructed by Psilocorsis spp.
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