Issue link: https://read.dmtmag.com/i/466321
www.goodfruit.com GOOD FRUIT GROWER MARCH 1, 2015 25 1960 1970 1980 1990 2000 2010 50 100 Adolf Butenandt LGHQWL¼HVWKHFKHPLFDO structure of bombykol, a silkworm pheromone. 1959 Harry Shorey FRQGXFWV¼UVW SKHURPRQH¼HOGWULDOV with Trichoplusia ni, the cabbage looper. 1967 (3$DSSURYHV¼UVW registered pheromone. It's for control of Pectinophora gossypiella, pink bollworm. 1978 EPA pheromone registrations COURTESY OF DON THOMSON These apples show codling moth damage. The top photo shows the plume of pheromone released by a passive dispenser. The size and reach of plumes from passive dispensers is the same regardless of concentration. The bottom is an example of a plume created by an active pheromone aerosol dispenser. The big burst of small particles that are 70 to 80 microns in size travel up to 500 feet. GARY JUDD AND MARK GARDINER, AGRICULTURE CANADA GOOD FRUIT GROWER FILE PHOTO Plumes of pheromone in an orchard work by making LWKDUGHUIRUPDOHVWR¼QG females and delaying mating. The dispensers are most effective when hung high and early in the season. COURTESY TODD M. GILLIGAN AND MARC E. EPSTEIN/COLORADO STATE UNIVERSITY Adult codling moth, Cydia pomonella.