Whiteflies Bemisia spp. and Thrips Thrips spp. Monitored in Greenhouses at Three Districts in Saudi Arabia

(Abdul Aziz bin Mohammed Ajlan)

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Abstract

Yellow sticky traps were used to monitor two piercing-sucking insects; whiteflies Bemisia spp. and thrips Thrips spp. on cucurbit plants during May and June, 2001. These sticky traps were placed at three heights (50, 100 and 150 cm) in greenhouses of three districts, Al-Hasa, Qatif, and Riyadh. The data showed that the mean number of whitefly adults captured per yellow sticky trap that placed at the three heights in May was higher in Qatif followed by Al-Hasa and Riyadh districts. The mean number of whiteflies/trap captured on sticky traps was also more than thrips in the respective districts. The whiteflies population was abundant in the three districts when compared with that of thrips. The variation of whiteflies and/or thrips population densities at different heights of sticky traps in different districts might be due to the natural flying ability affecting their migration due to climatic conditions.
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