الفهرس 
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Abstract
INTRODUCTION
The spiny bollworm, Earias insulena (Boisd.) is an injurious pest of cotton in Egypt. For nearly fifty years, up to 1913, this insect was the most serious pest of the Egyptian cotton crop. It attacks several parts of the cotton plant such as the terminal shoots, buds, and bolls. The larva bores into the squares and bolls causing a consid¬erable loss in yield. The pest also attacks other malvac¬eous plants. Other known host plants are bamia or okra (Abelmoschus esculentus), til or decan hemp (Hibiscus cannabinus) and other related species.
Many field and laboratory observations were made in order to find a good program for controlling the spiny bollworm, but no complete biological studies on this best have been perfomed .
However many workers agreed that rearing of phyto¬phagons insects on artificial diet serves many functions as the following:
1- Simplification of the maintenance of the insect colony.
It may be e8sier to obtain and prepare the components of an artificial diet than to provide a continuous supply of the natural fresh food.