Abstract
Movements of 1st-instars of pectinophora gossypiella (Saunders) on 6 varieties of cotton with leaves and petioles differing in amount of pubescence were observed, timed, and traced with a camera lucida. The 2 most pubescent varieties, SA-166 and TM-1(H2), appeared to confuse larvae and greatly impeded their movements. We conclude that high plant hair density in cotton is a promising mechanism for host plant resistance to the pink bollworm. Larvae paused regularly to head swing and to sample the substrate with their mandibles while moving on leaves and petioles. When leaf neclaries were encountered by larvae, feeding usually occurred.
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