الفهرس 
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Abstract
Although important recently to Egypt, the olive leaf have come recently to Egypt, but it is one of the most dangerous pests on olive, especially in the northern regions of the republic. Valerqat devour the tender leaves have sometimes devouring buds and branches. The impact of this insect on the cultivation of olive trees in terms of production. Biological studies as 1- Incubation period : Alanther put their eggs on the leaves of olive both the lower and upper surface of an individual or in the totals of 2-86 eggs. The color of the egg white Adipic when the situation turns yellow at hatching. The incubation period ranges from 3 days to 9.20 days in summer in winter. B - hatchability : the proportion of corruption vary from 76% in summer to 95% in the spring, and the data indicate that the spring is the best season of the year for the hatching process. C - a larval stage : pass the larva during its development in the larval six reconstruction. Age is the first larval ranges from 2.20 days to 4.15 days. As for the second, it varies from 2 days to 3.60 days. And third instar Vmdth extends from 2 days to 3 days. For the fourth age, the duration ranging from 1.75 days to 3 days . And fifth instar duration varies from 2 days to 3.15 days.