الفهرس 
Introduction
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Abstract
Egypt has numerous species of whiteflies, whereas, only three species were found to be important and causes a serious damage to several plants. The silverleaf whitefly, B. argentifolii was the most abundant one that attacking huge number of host plants. This species formed 55 and 67 % of the total whiteflies surveyed at Dakahelia governorate in 2003 and 2004, respectively.
whereas the ash whitefly S. phillyreae comes in the next place with 33 and 31 % in 2003 and 2004 respectively. On the other hand, the castor bean whitefly, T. ricini was found with lowest percentages during the two successive years of the present study. T. ricini listed 12 % in 2003 and 2 % in 2004 respectively. Er. mundus, En. inaron, En. lutea, En. formosa, were found attacking the whiteflies at Dakahelia governorate during 2003 and 2004. The dominant and important parasitoid was Er. mundus which listed 72 % in 2003 and 57 % in 2004 of the total parasitoids. This parasitoid was correlated with B. argentifolii and T. ricini, whereas, En. inaron was associated with the ash whitefly S. phillyreae. En. inaron formed 20 and 15 % of the total parasitoids during the two successive years. However En. lutea presented in low percentage, which listed 8 and 7 % in 2003 and 2004, respectively.
On the other hand, En. formosa appeared only in 2004 and formed 21 % of the total parasitoid. Er. mundus appeared with higher percentage on the watermelon 48.1 % followed by the cotton (21.4 and 16 %) in 2004 & 2003, respectively. Lantana came next and supported about 16.7 % of Er. mundus population on B. argentifolii. En. inaron, as a parasitoid of the ash whitefly, listed about 26.3 % in 2003 and 2004. whereas, En. formosa came next and recorded 13.8 % in 2004 only, while En. lutea showed a lowest percentage on S. phillyreae which recorded 6.7 %.