Comparative Studies on the Cotton Bollworms Infestation on Certain Economic Crops at Kafr El-Sheikh Governorate, Egypt

Abstract

Filed studies were carried out in Sakha Agricultural Research Station, Kafr El-sheikh governorate during the 2017/18 seasons to compare the three bollworm infestations (pink bollworm, Pectinophora gossypiella (Saund.), spiny bollworm, Earias insulana (Biosd.) and American bollworm, Helicoverpa armigera (Hub.), which attacking the cotton, the okra and the roselle. Results showed the mean percentage of infestation of the three ballworms larvae were (3.08, 5.69 and 2.32%) at the three crops (cotton, okra and roselle) during the two seasons. The infestation of the bollworms were beginning August to the end of the seasons. There were significant differences among to the three crops to the percentage of infestation of pink bollworm larvae during the two seasons. The cottoncame in the first category with mean (7.29%), while, the second was the green fruits of the okra with mean (1.64%), but, the last category was the roselle with mean 0.32%. While, the spiny bollworm larvae attacked the three crops by high significant percentage of infestation in the two seasons with mean the two seasons (7.68, 7.21 and 2.18%) on the okra, roselle, and the cotton, respectively. Finally, there were high significant differences, also, between the two crops by the infestationby American bollworm larvae, with mean the two seasons (3.18 and 1.46%) on the okra and the cotton, respectively, while, not found it at the green fruits of rosselle during the two seasons.