Undergraduate Thesis Or Project

 

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https://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/sj139378g

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  • The western spotted cucumber beetle (Diabrotica undecimpunctata undecimpunctata) and the western striped cucumber beetle (Acalymma trivittatum) are pests of many crops, including vegetable, fruit, and nursery crops. Pesticides are commonly used to control this pest. Trap and kill technologies are under development as use in an alternative control for cucumber beetles, the trap design includes three parts: a kairomone, cucurbitacin “beetle bar”, and plastic or plexiglass trap body. This project had three objectives, including: (1) to evaluate the effect of temperature on the degradation of the cucurbitacin concentration in the bait components of a trap and kill technology, (2) to evaluate kairomone lure longevity under field conditions, and (3) to evaluate effectiveness of alternative traps and design modifications on beetle capture rate. High Performance Liquid Chromatography was used to identify cucurbitacin degradation. The cucurbitacin content of the bait declined 23% over ten weeks at temperatures above 32°C but remained relatively stable at temperatures below 21°C. Duration of kairomone lure attractivity was determined in the field by beetle capture rate on variously aged kairomones. The kairomone was the most attractive as fresh or 1-day post prep lure, in comparison to older lures or no lures. A 35-day old lure caught more beetles than a nolure trap. Beetle capture rate was used to evaluate trap design efficiency. The dilution of the bait to 10% cucurbitacin increased beetle capture rate. A round trap design, called the OSU lab trap, was the most efficient trap for both spotted and striped beetles, while the modifications of a vent and minilure were inconclusive.
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