The fluctuations of Bemisia tabaci Gen. population (Homoptera: Aleyrodidae) on a tomato crop under plastic house in Mitidja (Algeria) | Fluctuations des populations de Bemisia tabaci Gen. (Homoptera: Aleyrodidae) sur tomates sous abri-serre en Mitidja (Algerie)
1996
Benmessaoud-Boukhalfa, H. (Institut national agronomique El Harrach, Alger (Algeria). Dept. de zoologie agricole et forestiere)
The study of the fluctuation of Bemisia tabaci Gen. population during four months on a tomato crop under plastic house in Mitidja (Algeria) revealed the existence of three annual generations and a fourth which is partial. The maximum density averages observed are 20.45 adults per plant along the third generation and 30.84 larvae of the fourth stage (L4) per plant along the second generation. As for all Aleurodes, the evolutive cycle of Bemisia tabaci is in close relation with the plant phenology. So, adults are found on turgescent young leaves for coupling and laying eggs. The mean density calculated is 2.64 adults per young leaf and 1.4 per old leaf. The fourth stage larvae (L4) are found in a very great number of the older leaves with an observed density of 3.38 L4 per old leaf against 1.08 L4 per young leaf
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