الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
INTRODUCTION
cotton, the world most important crop, is being culti-word, on more than 30 million hectars of land allover the world, and about 1.2 million feddans in Egypt. It is mainly grown for its fibers, although the seeds are also of great value for their oil which are used for the human consump¬tion and as livestook feeding. The crop is of particular importance to many developing countries whose export earning may be derived largely form the scale of cotton or cot-
Cotton lint is produced from a seed.-bearing capsule or boll, und the main insect-pests of the crop are those attack the bolls or the flower-buds (squares) which precede them. Besides, the other important Group of insects which attack the seedlings, leaves and stem of vegetative plants, the utmost injurious insect-lJ0sts to the bolls are the pink bollworm Pectinophora gossypiella (Saund.) and spiny bollworm Earias insulana (Boised.).
The pink bollworm is one of the rather dangerous and widespread on cotton in Egypt. It owes its dispersal success as a pest due to the diapause phenomenon in which :ho larvae remain inside the cotton-seeds, old bolls and the 3trash of the fields and are disseminated with them. Exten¬ive surveys of damagee caused by bollworm were carreied out is well as determination of yield and quality of the harv¬3st cotton.