The susceptibility of three varieties of bean, ‘PhaseoIus vulgaris L.) namely Bronco, Swiss blanc and Giza 3 to infestation with the whitefly (Bemisia tahaci Gennadius, Homoptera: Aleyrodidae) and aphids (A phis craccivora Koch and Myzus persicac Sultzcr, Homopicra: Aphididac) was investigated in Qalubia governorate in 1996 and 1997. Bronco variety was the most susceptible followed by Swiss blanc and Giza 3 was the least susceptible variety. A positive correlation existed between whitefly or aphid population on one hand and sugar and carbohydrate content in the leaves on the other. Aphid and whitelly populations were correlated with the anatomical structure of the leaves. Lower infestations occurred on the leaves with thicker spongy tissues. Giza 3 variety produced the highest seed yield followed by swiss blanc then Bronco.