Evaluation of synthetic sex pheromones for flax budworm Heliothis maritima adaucta butler (Lepidoptera: Noctuidae) in soybean fields
2020
Ono, T. | Yasuda, T. | Yasui, H. | Yokobori, A. | Oe, T.
Field studies were conducted to evaluate synthetic sex pheromones of the flax budworm Heliothis maritima adaucta in soybean from 2017 to 2018. Two compounds, (Z)-11-hexadecenal (Z11-16:Ald) and (Z)-11-hexadecen-1-ol (Z11-16:OH), have already been reported to be essential sex pheromone components of H. m. adaucta. First, the duration of effectivity of rubber septa impregnated with a 1000:20 blend of Z11-16:Ald and Z11-16:OH was evaluated. Among 0-7-day-old lures, 8-14-day-old lures, and 14-21-day-old lures, the number of male catches with lures of over 8 days old was significantly smaller than that of catches with 0-7-day-old ones. The results showed that lures should be changed every week. Among the ratios of 1000:5, 1000:10, 1000:20, 1000:40, and 1000:80 blends of Z11-16:Ald and Z11-16:OH, the optimum ratio was found to be 1,000:20 at a low population density. We conclude that the pheromone lure impregnated with blends of Z11-16:Ald and Z11-16:OH enables the monitoring of the population density of H. m. adaucta. However, more detailed surveys should be carried out to effectively utilize the synthetic sex pheromones in forecasting future crop damage and in pest management programs.
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