Optimization and field evaluation of the sex pheromone of Trichophysetis cretacea (Lepidoptera, Crambidae) for pest monitoring



Yong-jun Du (corresponding author), Institute of Health and Environmental Ecology, Wenzhou Medical College, University Park at Chashan Town, Wenzhou 325035, China. E-mail: dyj@wzmc.edu.cn


Field studies using the synthetic sex pheromone of Trichophysetis cretacea, a trinary blend of (Z)-11-hexadecenyl acetate (Z11-16:OAc), (Z)-11-hexadecenal (Z11-16:Ald) and (Z)-11-hexadecenol (Z11-16:OH), were performed in Sichuan to determine operational parameters for detection and control, such as dispenser type, blend ratio, dosage, and trap type, height and density. Of three pheromone dispensers tested, grey halo-butyl isoprene elastomeric septa were significantly more effective than polyvinyl chloride capillary tubing or silicone rubber septa. The ratio of the three components in the blend significantly affected moth catch. In the halo-butyl isoprene septa, the most effective ratio was 5 : 2 : 1 Z11-16:OAc:Z11-16:Ald:Z11-16:OH. Sticky wing traps caught significantly more moths than water, noctuid moth or cone funnel traps. The most effective height at which wing traps were hung was 20 cm above the jasmine plants. Optimum trap density was 45 traps per hectare. Addition of volatile jasmine compounds did not increase the attractiveness of the sex pheromone. A dosage of 50 μg Z11-16:OAc per lure was most effective in the autumn weather conditions of Quanwei. These data provide sufficient information to develop effective protocols for using the T. cretacea pheromone to detect and monitor this pest in the jasmine fields.