The feasibility of mating disruption in the oriental beetle, Anomala orientalis Waterhouse, with microencapsulated sprayable formulations of (Z)-7-tetradecen-2-one, the major sex pheromone component, was evaluated in turfgrass areas. The effect of the applications was measured by monitoring male A. orientalis captures in pheromone-baited traps throughout the flight period and estimating A. orientalis larval densities in September in soil/sod samples. Trap captures were 90–100% lower in the treated areas during the first 7–10 d after treatment, but started to increase thereafter. Therefore, applications were repeated after 14 d in most treatments. The formulation tested in 2002 and 2003 reduced trap captures by 87–88% with two applications of each 12.5 or 50 g pheromone/ha but only by 74% by a single application of 75 g pheromone/ha. Reductions of A. orientalis larval populations by 68–74% were not significant because of very high variability of larval densities in the nontreated areas. Two different formulations tested in 2004 were less effective. Significant amounts of the pheromone remained on grass foliage after application, but 51 and 73% of this residue were washed off the foliage with 3.2- and 6.4-mm post-treatment irrigation, respectively. Shoes walked at 1 day after treatment through pheromone-treated areas were sufficiently contaminated with pheromone to attract high numbers of A. orientalis males in nontreated areas. Mating disruption is a promising strategy for A. orientalis management in turfgrass. However, more persistent formulations need to be developed that have a lower potential to contaminate shoes and other clothing articles with pheromone.
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