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Asian Journal of Plant Sciences

Year: 2003  |  Volume: 2  |  Issue: 3  |  Page No.: 331 - 335

Impact of Different Genotypes of Sunflower (Helianthus annuus Linnaeus.) on the Number of Nezara viridula L., Aphis gossypii Glover. and Bemisia tabaci Gennad

Muhammad Misbah-ul-Haq, Muhammad Aslam and Syed Ahqabullah Kakakhel

Abstract

The impact of different genotypes of sunflower (Helianthus annuus Linnaeus) were seen on some important insects like and green stink bug (Nezara viridula), aphid (Aphis gossypii) whitefly (Bemisia tabaci) and their population was correlated with the yield. Viewing the results of green stink bug (Nezara viridula) it was found that 64 A 93 had significantly less mean population than HYSUN 33. Whereas SUPER 25, CRN 1435 and 65 A 24 were found to be partially susceptible. The genotypes 6451, SMH 9707, PARSUN I and SMH 9706 were found to be susceptible because they all had almost similar mean population as HYSUN 33. All other genotypes found to be highly susceptible. In case of aphid (Aphis gossypii) it was found that 64 A 93 was resistant because it had significantly less number of population than standard cultivar. Whereas SUPER 25, CRN 1435 were found to be partially resistant because they had less significant difference as compared to 64 A 93, 65 A 24, 6451 and SMH 9707 were found to be intermediately susceptible, whereas PARSUN I and SMH 9706 were susceptible and they were found to be similar to HYSUN 33. Other varieties found to be highly susceptible. The results for whitefly (Bemisia tabaci) revealed that the genotype 64 A 93, SUPER 25 and CRN 1435 were found to resistant, whereas 65 A 24 found to be intermediately susceptible. The genotypes SMH 9707 PARSUN I and SMH 9706 were found to be susceptible. Other varieties including SF 187, S-278, DK 3915, SH 3322, SS 2, SS 1 and SF 177 found to be highly susceptible when they were compared with standard genotype i.e. Hysun 33. Correlation was found to be negative for all the above insect pests i.e. as population increased the yield decreased as a result.

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