Codling Moths1: Fluorescent Powders as Markers2

Fluorescent powders used as markers for adult Laspeyresia pomonella (L.) bad significant effects on the fecundity or longevity of marked moths in the laboratory: Day-Glo® Blaze Orange and Rocket Red reduced the number of eggs per female, and Day-Glo Arc Yellow, Fire Orange, and Neon Red reduced egg hatch. In the greenhouse and in the orchard, Helecon® 2200 and Rocket Red produced a reduced response of marked males to females. Eosin-Y, included as a standard, bad no apparent effects on adult moths, but was harder to apply and more difficult to detect than were fluorescent powders.