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Journal of Applied Sciences

Year: 2002 | Volume: 2 | Issue: 6 | Page No.: 686-689
DOI: 10.3923/jas.2002.686.689
Realtive Resistance of Cotton Cultivars to Sucking Complex
Imtiaz A. Nazamani, Muzaffar A. Talpur, Rab Dino Khuhro and Shafi M. Nizamani

Abstract: The resistance level of ten cotton cultivars viz, AEH-1, AEH-2, AEH-4, AEH-6, CRIS-9, CRIS-121, CRIS-124, CRIS-128, CRIS-129 and Red Okra to sucking complex i.e. thrips, jassids, and whiteflies was evaluated in the cotton experimental field of IPM at Agriculture Research Institute, Tandojam during Summer, 2000. It was observed that the cultivar AEH-4 showed comparatively greater resistance to attack of thrips (infestation per leaf basis) when compared with rest of the cultivars tested and cultivar AEH-2 showed relative susceptibility to thrips attack. Cultivars AEH-1, AEH-4 and AEH-6 were highly susceptible to jassid, whereas cultivars CRIS-129, CRIS-121, CRIS-124, Red Okra, CRIS-128, AEH-2 and CRIS-9, showed medium response to jassid attack. The population of whitefly illustrate that cultivar Red Okra was found resistant to a greater level against this pest on per leaf infestation basis. It is concluded that thrips, jassids and whiteflies all attacked the cotton cultivars tested. Although, whiteflies population was very low thoughtout the observation period and its population was below economic injury level. The population of thrips rapidly increased between June 27th to July 11th and then sharply declined up to August 8th. After this date the population of thrips remained very low and did not exceed the level of one thrip per leaf infestation, while jassids population exceeded the economic injury level from July 11th to August 16th. It could, therefore, be inferred that control strategies to combat sucking insect pest should be planned during vegetative phase. However, the resistant cotton cultivars may be exploited to avoid environmental pollution and residual problems of insecticides.

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How to cite this article
Imtiaz A. Nazamani, Muzaffar A. Talpur, Rab Dino Khuhro and Shafi M. Nizamani, 2002. Realtive Resistance of Cotton Cultivars to Sucking Complex. Journal of Applied Sciences, 2: 686-689.

Keywords: reistance, population, sucking complex, cotton cultivars and injury level

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