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Female sex pheromone of brinjal fruit and shoot borer, Leucinodes orbonalis (Lepidoptera: Pyralidae): trap optimization and application in IPM trials

Published online by Cambridge University Press:  09 March 2007

A. Cork ,
S.N. Alam ,
F.M.A. Rouf  and
N.S. Talekar
A. Cork*
Affiliation:
Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK
S.N. Alam
Affiliation:
Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh
F.M.A. Rouf
Affiliation:
Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh
N.S. Talekar
Affiliation:
Asian Vegetable Research and Development Center, PO Box 42, Shanhua, Taiwan 741
*
*Fax: 00 44 1634 880066 E-mail: [email protected]
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Abstract

Delta and wing traps baited with synthetic female sex pheromone of Leucinodes orbonalis Guenée were found to catch and retain ten times more moths than either Spodoptera or uni-trap designs. Locally-produced water and funnel traps were as effective as delta traps, although ‘windows’ cut in the side panels of delta traps significantly increased trap catch from 0.4 to 2.3 moths per trap per night. Trap catch was found to be proportional to the radius of sticky disc traps in the range 5–20 cm radius, discs with a 2.5 cm radius caught no moths. Wing traps placed at crop height caught significantly more moths than traps placed 0.5 m above or below the crop canopy. Replicated integrated pest management (IPM) trials (3 × 0.5 ha per treatment) were conducted in farmers fields with young and mature eggplant crops. Farmers applied insecticides at least three times a week in all check and IPM plots. In addition pheromone traps were placed out at a density of 100 per ha and infested shoots removed weekly in the 0.5 ha IPM plots. Pheromone trap catches were reduced significantly from 2.0 to 0.4 moths per trap per night respectively in check and IPM plots in a young crop and 1.1 to 0.3 moths per trap per night in check and IPM plots respectively in a mature crop. Fruit damage was significantly reduced from an average of 41.8% and 51.2% in check plots of young and mature crops respectively to 22% and 26.4 respectively in the associated IPM plots. Significant differences in pheromone trap catches and fruit damage were attained four and two weeks respectively after IPM treatments began in the mature crop whereas in the immature crop significant differences were not observed for the first eight to nine weeks respectively. The relative impact of removing infested shoots and mass trapping on L. orbonalis larval populations was not established in these trials but in both cases there was an estimated increase of approximately 50% in marketable fruit obtained by the combination of control techniques compared to insecticide treatment alone.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 93 , Issue 2 , April 2003 , pp. 107 - 113
Copyright
Copyright © Cambridge University Press 2003

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