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The present work was carried out during two successive seasons (2012 and 2013) at Farm of Sakha Agricultural Research Station, Kafr El-Sheikh Governorate, Egypt to evaluate the influence of different cotton varieties and genotypes on the infestation by the spiny bollworm Earias insulana (Boisd.) at Kafr El-Sheikh Governorate. Results during the two experiments showed the infestation percentage of SBW to six cotton varieties and genotypes of both seasons were (8.14, 7.64, 7.66, 6.08, 7.16 and 8.36%) for Giza 86, Pima S6 x Giza 77, Giza 92, Giza 94, Giza 86 x 10/229 and Giza 88, respectively. The highest means of infestation % were recorded in the G.88 and G.86 in both seasons, while the lowest means of infestation% were recorded in the G.94 and G.86 x 10/229 in both seasons. The differences among means of infestation % may be due to the differences of gossypol % in wall thickness of green boll. The means of gossypol% in green boll wall were (1.78, 1.32, 1.44 0.91, 1.75 and 1.16%) and the means of wall thickness were (2.77, 2.38, 2.07, 2.82 , 3.04 and 2.94 mm) for above cotton varieties and genotypes during both seasons, respectively. There were highly significant differences among the cotton varieties and genotypes in some characters.

INFLUENCE OF DIFFERENT COTTON VARIETIES AND GENOTYPES ON THE INFESTATION BY THE SPINY BOLLWORM Earias insulana (BOISD.)AT KAFR EL-SHEIKH GOVERNORATE