Evaluation of Shin-Etsu twist-tie rope dispensers by the mating table technique for disrupting mating of the cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae), and the pink bollworm, Pectinophora gossypiella (Lepidoptera: Gelechiidae)
Co-Authors:
Kehat, M., Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Anshelevich, L., Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Gordon, D., Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Harel, M., Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Dunkelblum, E., Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Abstract:
Different Shin-Etsu twist-tie rope formulations, containing either the cotton bollworm, Helicoverpa armigera (Hubner) pheromone or pink bollworm, Pectinophora gossypiella (Saunders) pheromone, or both, in the same rope, were tested in Israel for mating disruption. The success of mating disruption was evaluated by the mating table technique, comparing the percentage of mating of virgin sentinel females in pheromone-treated and control plots. Two variants of this technique were evaluated, one with two mating tables per plot, each containing five to seven females, and the other with six to eight mating tables per plot, with only one female per table. The latter method was more sensitive than the former, particularly at low population densities. Two tests were conducted in 1995 in order to compare a blend of five components of H. armigera pheromone with a blend of two components for mating disruption. The application consisted of 2000 ropes/ha, each with 80 mg pheromone. Evaluation by the two mating table methods showed clearly that the formulation containing two components was superior to the five-component blend for mating disruption, suppressing mating almost completely for 49 days. A new combined formulation, HPROPE, containing 175 mg of the H. armigera two component blend and 65 mg of P. gossypiella pheromone was tested in 1996 for mating disruption of both pests. Application of 625 ropes/ha caused a high level of suppression of mating of H. armigera females for at least 94 days and that of P. gossypiella females for 161 days. The pheromone release rates were c. 625 mg/day/ha for H. armigera and 162 mg/day/ha for P. gossypiella. A 'long-life' formulation of P. gossypiella pheromone, PBW rope L(R), applied at 125 ropes/ha releasing 137 mg/day/ha achieved complete suppression of mating over 75 days. This release rate of P. gossypiella pheromone was much lower than that currently used in Israel (275 mg/day/ha). The present study indicates that mating of females of two moth pests with different pheromones can be disrupted by one combined formulation.
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