Several laboratory and field experiments were conducted to understand the oviposition behavior of the diamondback moth [Plutella xylostella (L.)], a destructive pest of crucifers throughout the world. Diamondback moth lay eggs mainly on cabbage plant outer leaves. On outer leaves, eggs are laid mainly on the upper leaf surface; on inner leaves they are laid on the lower leaf surface. Egg density decreased from outer to inner leaves. Within a range of 1-11 trichomes per 9 sq. mm leaf area, the number of eggs laid on Chinese cabbage leaves increased with trichome density. Most oviposition activity took place within two hours after sunset; this period coincides with maximum mating-related flying activity. During daylight hours when the diamondback moth does not normally lay eggs, initiation of darkness stimulated oviposition. However, during night when this insect normally lays eggs, artificial light did not reduce oviposition activity.
Trichomes, Oviposition periodicity, Oviposition stimulation, Oviposition location, Plutella xylostella
