الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The present studies were carried out in the experimental farm belonging to the Faculty of Agriculture, Mansoura University, Mansoura, Egypt to evaluate the population abundance of the citrus mealybug Planococcus citri (Risso) , The cottony cushion scale Icerya purchasi Maskell , the Egyptian mealybug Icerya aegyptiaca (Douglas) and The Seychelles fluted scale Icerya seychellarum (Westwood) on different citrus host plants as Mandarin, Lemon, Common balady orange , Washington navel orange and Succari (sweet) orange trees. Furthermore, the seasonal activity of the main associated predators with the mealybug species during the two successive years 2014/15 and 2015/16 was evaluated. As well as, Laboratory experiments were carried out to study the influence of different host plants on some biological characteristics of I. seychellarum. The experiments were carried out in the insectary of the Economic Entomology Department, Behavioural responses of chrysoperla carnea (Chrysopidae: Neuroptera) and Rodolia cardinalis (Coccinellidae: Coleoptera) to Citrus mealybug, P. citri (Pseudaucoccidae: Hemiptera).