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Effect of Genotype and Cultural Practices on Helicoverpa armigera Damage to Cotton

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Abstract

—The response of two cotton varieties (TCH 1002 and 77/10) and two hybrids (TCHB 213 and DCH 32) to damage caused by the American bollworm, Helicoverpa armigera was evaluated under two spacings and three fertiliser levels each. Variety TCH 1002 was less damaged than 77/10, whereas between hybrids, DCH 32 was less preferred than TCHB 213. Damage was higher when the varieties were grown at a spacing of 50 × 20 cm and the hybrids at a spacing of 120 × 45 cm compared to 75 × 30 and 120 × 60 cm, respectively. Increasing the amount of fertiliser applied did not have any significant effect on damage caused by the pest. Tannin and gossypol contents were found to influence levels of damage caused by H. armigera. A combination of high tannin and gossypol resulted in reduced damage. The highest tannin content in varieties was recorded in leaves of TCH 1002 grown at a spacing of 75 × 30 cm, with a fertiliser level of 120:60:60 NPK kg/ha. The highest gossypol content was recorded in flowers of TCH 1002 under similar spacing and management levels. In the hybrids, the highest tannin and gossypol contents were recorded when DCH 32 was grown at 120 × 60 cm spacing with a fertiliser regime of 120:60:60 NPK kg/ha. Cotton was damaged to a greater extent when grown at a closer spacing. Increasing levels of nitrogen resulted in higher damage levels.

Résumé

—La réaction de deux variétés et deux hybrides de coton aux dégâts dus au charançon du cotonnier américain, Helicoverpa armigera a été évaluée à deux espacements et 3 niveaux de fumure chacun. Des deux variétés étudiées, TCH 1002 a été moins endommagée que la 77/10, tandis qu’entre les deux hybrides, DCH 32 a été moins préféré que le TCHB 213. Les dégâts ont été plus accentués quand les variétés étaient cultivées à l’écartement de 50 × 20 cm que quand elles l’étaient à l’écartement de 75 × 30 cm et les hybrides à l’écartement de 120 × 45 cm plutôt qu’à celui de 120 × 60 cm. L’amendement à l’aide de fumures n’a pas eu de résultat significatif concernant les dégâts causés par les ravageurs. La teneur en tanin et en gossypol a influençé les niveaux de dégâts dus à H. armigera. La combinaison d’une forte teneur en tanin et en gossypol chez les variétés a causé une réduction des dégâts. La teneur la plus élevée en tanin dans les variétés a été enregistrée dans les feuilles sur TCH 1002 quand il était cultivé à l’écartement de 75 × 30 cm, et un niveau de fumure de 120:60:60(NPK) kg/ha. La plus forte teneur en gossypol dans les fleurs a été enregistrée dans des conditions semblables. Chez les hybrides, les plus fortes teneurs en tanin et en gossypol ont été enregistrées quand DCH 32 était cultivé à l’écartement de 120 × 60 cm et un regime de fumure de 120:60:60 NPK kg/ha. Il y a eu plus de dégâts sur coton à un espacement plus rapproché. L’augmentation du niveau d’azote a aussi entraîné une augmentation des dégâts.

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Ramnath, S., Uthamasamy, S. Effect of Genotype and Cultural Practices on Helicoverpa armigera Damage to Cotton. Int J Trop Insect Sci 16, 207–215 (1995). https://doi.org/10.1017/S1742758400017124

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