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Journal of Biological Sciences
Year: 2001  |  Volume: 1  |  Issue: 9  |  Page No.: 835 - 839

Response of Different Insect Pests to Some Sunflower (Helianthus annuus Linnaeus, Compositae) Genotypes and their Correlation with Yield Component under Field Conditions

Muhammad Ashfaq and Muhammad Aslam    

Abstract: Field studies were carried for response of different insect pests to some sunflower genotypes and their correlation with yield component. The most important species attacking on the fourteen sunflower genotypes were Whitefly (Bemisia tabaci Gennad.), Surface grasshopper (Chrotogonous spp.) and Green leafhopper (Empoasca spp.). As for as the infestation of Bemisia tabaci is concerned, the sunflower genotypes 9705 was found partially resistant whereas JH299S and JH199S were partially susceptible. The sunflower genotypes Parsun-1, PSF-025, Hysun-777, Award and 9707 were found intermediately susceptible. The sunflower germplasms XF-263, T-562 and PNSF-1 were susceptible. The genotypes 1435 and 9706 were considered as highly susceptible. The results described for Empoasca spp. concluded that the genotypes of sunflower 9705 and JH299S were found partially resistant whereas JH199S and Hysun-777 were considered as partially susceptible. The sunflower germplasms T-562, XF-263, PNSF1, 1435 and PSF-025 were taken as partially susceptible. The genotypes Parsun-1 and 9706 were found susceptible whereas 9707 and Award were highly susceptible. The genotypes 9705, 9707 and JH299S were found partially susceptible against Chrotogonous spp. whereas JH199S, PSF-025 and 1435 were declared as intermediately susceptible as compared to Hysun-33. PNSF1, Hysun-777 and 9706 were susceptible and the Parsun-1, T-562, XF-263 and Award were taken as highly susceptible. The genotypes 9705, JH299S, 9707 were partially susceptible against Chrotogonous damage as compared to Hysun-33 whereas PSF-025 was taken as intermediately susceptible. The sunflower genotypes 1435, PNSF1 and Hysun-777 were found susceptible and when Hysun-33 was compared with the sunflower genotypes 9706, Parsun-1, T-562, XF-263 and Award, these were highly susceptible. A negative correlation was observed between the population of pests and yield of sunflower genotypes. The correlation between percent plot damage and Chrotogonous population was found positive which understand that with increase in pest population, the damage was also increased.

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