Synthetic host volatiles increase efficacy of trap cropping for management of Colorado potato beetle, Leptinotarsa decemlineata (Say)

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1 The attractiveness of pitfall traps baited with a synthetic host volatile attractant to colonizing adult Colorado potato beetle, Leptinotarsa decemlineata (Say) was evaluated in a field setting.

2 Significantly more postdiapause, colonizing adult L. decemlineata were captured in baited than unbaited pitfall traps.

3 The potential for this synthetic kairomone to enhance the efficacy of trap cropping as a management tool was evaluated by comparing conventionally managed plots with like-sized plots bordered by either attractant-treated trap crop or untreated trap crop.

4 More postdiapause, colonizing adults, egg masses and small larvae were present in attractant-treated trap crops than in untreated trap crops.

5 There were no significant differences in egg mass and small larvae densities between plots bordered by attractant-treated trap crops and conventionally managed plots, but there were significantly fewer large larvae and adult beetles in conventionally managed plots.

6 Plant canopy area of conventionally managed plots was significantly greater than in plots bordered by either type of trap crop.

7 Yields for conventionally managed plots and plots bordered by attractant-treated trap crops did not differ, and less insecticide (44%) was applied to plots bordered by attractant-treated trap crops.

Keywords: Attractant; Colorado potato beetle; kairomone; plant volatiles; semiochemicals

Document Type: Research Article


Affiliations: 1: Department of Biological Sciences, University of Maine, Orono, ME 04469, U.S.A. and 2: 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: February 1, 2005

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