Persistent effects of aerial applications of disparlure on gypsy moth: trap catch and mating success
2007
Thorpe, Kevin W. | Tcheslavskaia, Ksenia S. | Tobin, Patrick C. | Blackburn, Laura M. | Leonard, Donna S. | Roberts, E Anderson
In forest plots treated aerially with a plastic laminated flake formulation (Disrupt® II) of the gypsy moth sex pheromone disparlure to disrupt gypsy moth, Lymantria dispar (L.) (Lepidoptera: Lymantriidae), mating was monitored the year of treatment and 1-2 years after treatment to determine the effects of the treatment on suppression of trap catch and mating success. In the year of treatment, there was a greater than 95% reduction in trap catch and a greater than 98% reduction in mating success compared to controls. One year after treatment at a dosage of 37.5 g active ingredient (a.i.) ha⁻¹, trap catch was reduced by 46-56% and mating success was reduced by 60-79%. Both trap catch and mating success were significantly reduced compared to controls in plots treated 1 year previously at 15 g a.i. ha⁻¹. Trap catch, but not mating success, was significantly reduced 2 years after treatment at 37.5 g a.i. ha⁻¹. The efficacy of mating disruption (MD) treatments in the Slow-the-Spread of the Gypsy Moth program was significantly reduced 2 years compared to 1 year after treatment. No such reduction was observed in plots treated with aerial applications of Bacillus thuringiensis kurstaki. The higher apparent efficacy of MD treatments 1 year after application may result to some extent from the suppression of moth capture in pheromone traps from the persistent effects of the previous year's treatment.
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