[Relationships between eggplant leaf pubescent and its resistance to Polyphagotarsonemus latus]

With 27 eggplant varieties as test objects, this paper studied the effects of their leaf pubescent on the field population density of Polyphagotarsonemus latus, its injury index on eggplant leaf, and population growth rate. The results showed that the density and length of leaf pubescent differed with eggplant varieties. For the same variety, leaf pubescence had a higher density but a shorter length on reverse side than on obverse side. Among the test varieties, 7 resistant varieties had a significantly higher mean pubescence density than 6 susceptive varieties on their reverse side leaf. The higher the pubescence density on reverse side eggplant leaf, the less field population density of P. latus and the lower injury index of eggplant leaf, suggesting a positive correlation between the pubescence density on reverse side eggplant leaf and the resistance of eggplant to P. latus.