STUDIES ON PINK BOLLWORM PECTJNOPHORA GOSSYPIELLA (SAUND.) AND SPINY BOLLWORM EAR/AS INSULANA (BOISD.) IN COTTON FIELDS, SHARKIA GOVERNORATE

Abstract

The present work was carried out on cotton plants. which were grown for the first time in newly reclaimed area of El­ Khattara district, Sharkia Governorate during two successive seasons 1996 and 1997 to investigate under field conditions the seasonal fluctuation of both spiny and pink bollworms in cotton plants and also to determinate the effects of both fertilizers (macro and microelements) and NeemAzal formulations on flower buds and green bolls infestation. Laboratory experiments were carried out to study the effect of two NeemAzal formulations on some biological aspects of spiny and pink bollworms. The obtained data revealed that there were two activity periods for spiny bollworm moths during season 1996, the first period was extended from the beginning of May until the third week of June, while the second one was extended from the third week of July until the second week of October. The highest peaks were recorded during the two successive seasons were in the 4th week of August 1996 (760 moths \ trap \ week) and in the 2"d week of September, 1997 (740 moths \ trap \ week). Generally, the second activity period was the highest compared with the first one. The spiny bollworm moths recorded 6 generations a year.