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Study Of The Relationship Between Temperatures And Development Period For The Greenhouse White Fly Trialeurodes vaporariorum, Tobacco White Fly Bemisia Tabaci And The Parasitoid Encarsia formosa.
- Randa Abou Tara (1), Fawzi Samara and Wajih Kassis (2)
(1) General Commission for Scientific Agricultural Research, P.O. Box 113, Damascus, Syria
E-mail: protlib@mail.sy
(2) Faculty of Agriculture, University of Damascus, Damascus, Syria.
Abstract
The relationship between temperature changes and development period was studied for the parasitoid Encarsia formosa, greenhouse whitefly and tobacco whitefly Bemisia tabaci, under laboratory conditions. The results indicated that the development period for each of the parasitoid and its hosts was significantly affected by temperature changes, in addition to a strong relationship between them. The development period for the whitefly T. vaporariorum was 67, 23 and 19 days under a temperature of 20.29, 26.4 and 33.5 C, respectively. The development period for the parasitoid E. formosa intruding on T. vaporariorum beginning from the egg stage until adult stage was 46, 21 and 13 days under a temperature of 19.61, 24.47 and 27.2 C, respectively. Whereas, the development period of B. tabaci was 80, 22 and 15 days, under a temperature of 18.78, 25.9 and 35.36 C, respectively. Also the development period for the parasitoid E. formosa intruding on B. tabaci beginning from the egg stage until adult stage 49, 20 and 18 days under a temperature of 18.97, 24.5 and 34.25 C, respectively. It was found that the optimal temperature for E. formosa development under laboratory conditions was 27 C, where the development period for the parasitoid lasted 13 days on the host T. vaporariorum, which conforms with all previous studies.
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