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Novel Use of Japanese Beetle Pheromone & Floral Lures to Reduce Grub Populations in Turfgrass 1997

Project Leaders: M. G. Villani , L. W. Roelofs

Objective:

Determine whether Japanese grub populations can be reduced in turfgrass by uncoupling the dual lure system used in standard Japanese beetle traps and instead using a two lure-two trap system to isolate male and female subpopulations, thereby decreasing mating opportunities.

a. Compare the sex ratios of standard Japanese beetle traps baited with either pheromone or floral lures to those of similar traps baited with both lures (standard).

b. Sample for grub populations in the turfgrass influenced by the traps to determine whether our trapping protocol significantly reduced grub populations when compared to similar areas with standard traps, or no traps at all.

Results:

The "pheromone only" traps caught fewer beetles overall at the five sites than did the standard combined-lure traps when total numbers over all trapping dates were compared. Pair-wise comparisons of pheromone-baited and floral-baited traps indicate that floral lures are more attractive to Japanese beetle adults than are pheromone lures over the course of a trapping season. There was no significant shift in the male/female ratio in either the floral or dual-lure traps over time. Pheromone traps catches were 82-90% male, floral-lure trap catches were 50-62% female, and dual-lure trap catches were 34-44% female. These results suggest that the separate lure system is more effective in trapping males and females in separate traps than the dual-lure system but is less effective in attracting and trapping beetles overall. Sufficient segregation to prevent mating was not achieved.