Seasonal Variations in Pheromone Trap Catches of Male Omnivorous Leafroller Moths, Platynota stultana12

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Abstract
Field trapping tests with a range of pheromone component ratios throughout the year showed that there were noticeable shifts in the best treatment for trapping male omnivorous leafroller moths, Platynota stultana (Walsingham). The best ( E )-11/( Z )-11-tetradecenyl acetate ratios were those with 88–94% of the E-11 compound during the cooler months, whereas those with 70–80% of the E-11 compound captured the most males during the warmer months. Female moths produce a ratio of ca. 88:12 E:Z throughout the whole season. It is postulated that the high release rates of mixtures in the warm months effects male orientation disruption to the natural blend, but that other ratios, such as 80:20 or 70:30 become effective attractants when the release rate increases as the result of warmer temperatures.

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