Population studies on different species of leaf-hoppers infesting certain truck crops in Egypt (Hemiptera:Cicadellidae).
Details are given of the occurrence and abundance of Cicadellids in field plots of tomato, egg-plant [Solanum melongena], pepper [Capsicum], marrow, cowpea [Vigna unguiculata], okra [Hibiscus esculentus] and potato grown in Egypt in 1964-65. Some 15 species were recorded. Empoasca lybica (de Berg.) mainly attacked egg-plant and formed 90% of the population of leafhoppers on this vegetable. E. decipiens Paoli was generally the most abundant species on the other crops, though Asymmetrasca decedens (Paoli) was almost equally abundant on cowpea.Details are also given of small-scale field-plot studies to determine the relative susceptibility of 32 varieties of potato and three each of cowpea, egg-plant and broad bean [Vicia faba] to infestation by leafhoppers. Varietal differences in susceptibility were observed in egg-plant and potato, but not in cowpea or broad bean.