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Effect of density of pheromone sources, pheromone dosage and population pressure on mating of pink bollworm, Pectinophora gossypiella (Lepidoptera: Gelechiidae)

Published online by Cambridge University Press:  09 March 2007

M. Kehat ,
L. Anshelevich ,
D. Gordon ,
M. Harel ,
L. Zilberg  and
E. Dunkelblum
M. Kehat
Affiliation:
Institute of Plant Protection, Agricultural Research Organization, Bet Dagan 50250, Israel
L. Anshelevich
Affiliation:
Institute of Plant Protection, Agricultural Research Organization, Bet Dagan 50250, Israel
D. Gordon
Affiliation:
Institute of Plant Protection, Agricultural Research Organization, Bet Dagan 50250, Israel
M. Harel
Affiliation:
Institute of Plant Protection, Agricultural Research Organization, Bet Dagan 50250, Israel
L. Zilberg
Affiliation:
‘Eden’ Experimental Station, Bet Shean, Israel
E. Dunkelblum*
Affiliation:
Institute of Plant Protection, Agricultural Research Organization, Bet Dagan 50250, Israel
*
* Fax: 972 3 9683647 E-mail: [email protected]
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Abstract

The effect of density of the Shin-Etsu twist-tie rope pheromone formulation (PBW rope L®) on mating of female pink bollworm, Pectinophora gossypiella(Saunders) was tested in Israel. The success of mating disruption was evaluated during 1997 by the mating table technique, comparing the percentage of mating of virgin sentinel females in pheromone-treated and control plots. Under low pest population pressure application of ‘long-life’ formulation of P. gossypiellapheromone, PBW rope L®, spaced 9 m, 11 m and 14 m apart, resulted in very high suppression of mating (96.5–100%) and complete shut-down of pheromone trap catch. These application rates were much lower than those now prevailing in Israel and elsewhere. Spacing of ropes 20 m apart resulted in less effective mating disruption of 65% only, and shut-down of pheromone traps was also incomplete. The tests during 1998 were carried out at high pest population and efficacy of treatments was assessed by the reduction of male capture in traps in pheromone-treated plots relative to catches in the control. The distance between pheromone sources proved to be the most critical factor determining success. In both years, any spacing significantly greater than 10 m gave markedly less than complete trap catch shutdown/mating suppression. Pheromone dosages and population density were also important in determining mating success. Results obtained in this study indicate the possibility of reducing the number of pheromone sources per unit area and the total amount of pheromone as compared with that in use today, only at very low pest populations. However at high population levels, dispensers closely-spaced, with increased dosages of pheromone, are required.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 89 , Issue 4 , April 1999 , pp. 339 - 345
Copyright
Copyright © Cambridge University Press 1999

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