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Laboratory and greenhouse evaluation of a synthetic host volatile attractant for Colorado potato beetle, Leptinotarsa decemlineata (Say)

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Abstract

1 The attractiveness of potato plants treated with a synthetic host volatile blend [(Z)-3-hexenyl acetate (+/–)-linalool, and methyl salicylate] to newly emerged and 5-day-old adult Colorado potato beetle, Leptinotarsa decemlineata (Say), was compared at four doses against untreated control plants and plants treated with an azadirachtin-based antifeedant in greenhouse cage arenas.

2 Attractant-treated plants (derived release rates of 0, 5.7, 17.1 or 57 µg/h) were significantly more attractive than untreated control plants to newly emerged and 5-day-old adults only at 57 µg/h.

3 Attractant-treated plants were significantly more attractive than antifeedant-treated plants to newly emerged and 5-day-old adults at the 5.7 µg/h treatment level and higher. Mean insect density on attractant-treated plants in the attractant/antifeedant study was significantly higher than in the attractant/control study.

4 Habituation to the synthetic attractant was evaluated by exposing adult beetles to the synthetic attractant for 0, 1, 2.5, 4, 8, 12 or 16 h, before release into a wind tunnel in which an attractant-baited plant model was placed at the upwind end. Insects exposed to the synthetic host attractant for ≤ 8 h moved to the synthetic attractant-baited plant model whereas insects exposed to the synthetic host attractant for 12 and 16 h did not. Furthermore, beetles exposed to the synthetic attractant for 0 and 1 h moved at rates greater than, or equal to, the median whereas beetles exposed for longer time periods moved at rates significantly less than the median.

5 These results demonstrate the potential for using the synthetic plant attractant and an antifeedant as components in a stimulo-deterrent strategy for management of the Colorado potato beetle as shown by us in another study.
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Keywords: Antifeedant; Colorado potato beetle; attractant; plant volatiles; semiochemicals

Document Type: Research Article

Affiliations: USDA-ARS, Henry A. Wallace Beltsville Agricultural Research Center, Plant Sciences Institute, Chemicals Affecting Insect Behaviour Laboratory, Beltsville, MD 20705, U.S.A.

Publication date: 2005-02-01

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