Optimization of Pheromone Traps for Coryphodema tristis (Lepidoptera: Cossidae)

Abstract

The Coryphodema tristis (Drury) is an important pest of Eucalyptus nitens (Deane and Maiden) plantations in South Africa. The gregarious larvae of this pest cause damage by feeding on the tree sapwood, and adults emerge in spring each year. The aim of this study was to optimize pheromone traps for operational use in management programs. This was achieved by investigating different pheromone blend combinations and trap types for efficacy under field conditions. Our results confirm that the cross vane bucket funnel trap baited with a 95:2.5:2.5 volumetric blend of Z9-14:OAc, Z9-14:OH, and 14Ac was superior to similarly baited standard bucket funnel and delta traps. We also estimated the release rate and ratios of the pheromone compounds loaded into an artificial permeation dispenser through solid-phase microextraction sampling. Results showed that the released blend of pheromone compounds mirrored the dispensed ratios relatively accurately and that release rates are affected by temperature.

Monitoring Chilecomadia valdiviana (Lepidoptera: Cossidae) Using Sex Pheromone-Baited Traps in Apple Orchards in Chile

“…All traps tested collected male moths over several weeks with little servicing required. We found that roof and cross vane spacers did not increase the catch in bucket traps, which differs from the results reported by Bouwer et al [40]. Therefore, we recommend that growers use the cheaper bucket traps (6L) without roof or cross vane spacers for mass trapping of C. valdiviana in Chilean apple orchards.…”

“…Furthermore, higher catches were found higher in the canopy for P. robiniae, with no effect of trap color [37], and the same was also true for A. centerensis across various lures and trap heights [39]. For Coryphodema tristis (Drury) in eucalyptus plantations in South Africa, cross vane bucket traps performed better than bucket funnel or Delta traps [40]. Similarly, the color of plastic funnel traps had no effect on catches of Cossus cossus L. in Populus plantations in Italy [41].…”