SUSCEPTIBILITY OF CERTAIN TOMATO VARIETIES TO INFESTATION WITH SOME INSECT PESTS

Susceptibility of 4 tomato varieties namely Pacesetter 502, Ros­sel VFN, Ace and Alex. 61 F₁ to infestation with adults of Myzus persic­ae, Empoasca decipiens, Bemisia tabaci and larvae of Autographa spp. was investigated in summer and nili plantations of 1991. The results in-_. dicated that certain tomato varieties were susceptible to infestation with some insects while others were somewhat resistant. As for M.persicae, Alex. 61 F₁ was the most resistant and Pacesetter 502 was the highest susceptible followed by Ace in summer plantation. Aphid in­festation in summer plantation was more abundant than in nili planta­tion. B . tabacf infestation in summer was low in Alex. 61 F₁ followed by Ace and was high in Rossel VFN with no significant differences in nili plantation. Concerning E. decipiens infestation in summer it was low with no significant differences between summer and nili plantations. In­festation with Autographa spp. was low in summer and nili plantations. Data concerning the yield of the different varieties indicated that. Alex. 61 F₁ had the highest fruits per plant and fruit's weight . Nili plantation gave the highest yield. The results showed that type of variety and time of growing season play a role in susceptibility rate and the quantity of yield.