| Summary: | 碩士 === 國立臺灣大學 === 植物醫學碩士學位學程 === 105 === The silverleaf whitefly (Bemisia argentifolii Bellows & Perring) is a serious pest and a virus vector of various crops, especially in agricultural facilities. Exploration of non-chemical methods to control this pest is necessary because whiteflies rapidly develop resistance to many classes of insecticides. Physical control techniques such as color traps are used frequently to reduce whitefly populations. Color traps utilize the attractiveness of specific wavelength ranges to insects. However, other factors that affect insect visual attraction behavior should also be discussed. This study focuses on how shapes, background colors, light wavelengths, light intensities and addictional light sources affect visual attraction to whiteflies, and also how modified traps contribute to whitefly management in agricultural facilities. Results show that among the four shapes of our multi-choice experiment, whiteflies preferred circles and squares. Black background enhanced the proportion of whiteflies trapped in laboratory and greenhouse experiments, but may reduce light intensity and result in lower attractiveness when used in a field setting. Yellow-green light (500-600 nm) was found to attract whiteflies. Blue-violet light (400-490 nm) was shunned by whiteflies and suppressed the attractiveness of yellow-green lights when combined, suggesting there is a wavelength range in blue-violet light that is repulsive to whiteflies, although this range is still unknown. Green light emitting diodes (LEDs) with wavelength peak at 516 nm combined with clear sticky cards significantly increased attractiveness to whiteflies. But attractiveness of yellow sticky trap with LEDs showed no difference to traps without LEDs.
|
|---|
