Behavioural responses of larvae of Colorado potato beetle,Leptinotarsa decemlineata (Coleoptera: Chrysomelidae), to host plant volatile blends attractive to adults

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1 Orientation of second- and fourth-instar Colorado potato beetle (CPB) Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), to volatiles emitted from a solanaceous host, potato, and seven synthetic blends or three individual chemicals emitted by potato plants were investigated in laboratory bioassays.

2 Both second- and fourth-instar CPB were attracted to intact and mechanically damaged (MD) potato foliage. When offered a choice between intact and MD foliage, no preference was observed.

3 Among seven synthetic blends tested (of which six are attractive to adult CPB), second- and fourth-instar CPB were attracted only to a single three-component blend comprising (±)-linalool, methyl salicylate, and (Z)-3-hexenyl acetate. Individual compounds and two-component blends were inactive. No significant difference was noted between larval responses to the attractive synthetic blend vs. MD potato foliage.

4 Second-and fourth-instar larvae had similar thresholds for behaviour for the three-component blend (50 µg source load). Female CPB were attracted to source loads 10× below the larval threshold (5 µg). Male CPB were the most sensitive life form tested with a behavioural threshold at 0.5 µg source load which was 10× and 100× below female and larval thresholds, respectively

5 This is the first report of a synthetic chemical attractant for CPB larvae. As both larval and adult CPB are attracted to a single chemical blend, the usefulness of the attractant as a component of an attracticide or ‘push-pull’ strategies for management of pestiferous populations is enhanced.

Document Type: Research Article

Publication date: November 1, 2002

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