Relative susceptibility of six cotton varieties to infestation by the spiny and the American bollworms [electronic resource].

Includes references.

The present investigation aimed to determine the susceptibility of six Egyptian cotton varieties (Giza 45. Giza 70, Giza 85, Giza 86, Giza 88 and Giza 89) to infestation by the spiny bollworm, Earias insulana (Boisd.) and the American bollworm, Heliothis armigra(Hbn.). Also, the effect of mean temperature, relative humidity and wind speed on occurrence and seasonal abundance of the two cotton bollworms during 2002 and 2003 growing seasons was studied. Results revealed that cotton (Giza 88) was the most tolerant variety to infestation by both bollworm species during the two seasons of study. Giza 89 was the most susceptible variety to infestation by the spiny bollworm, whereas Giza 85, Giza 86 and Giza 89 were the most susceptible varieties to infestation by the American bollworm. The prevailing weather factors had slight effect on the population of spiny and American bollworms.

Summary in Arabic.

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