Population dynamics of insect pests of cotton and their natural enemies
2011
Ashfaq, S. (Khyber Pakhtunkhwa Agricultural Univ., Peshawar (Pakistan). Dept. of Entomology) | Khan, I.A. (Khyber Pakhtunkhwa Agricultural Univ., Peshawar (Pakistan). Dept. of Entomology) | Saeed, M. (Hazara Univ., Mansehra (Pakistan). Dept. of Entomology) | Ahmad-ur-Rahman, S. (Khyber Pakhtunkhwa Agricultural Univ., Peshawar (Pakistan). Dept. of Plant Protection) | Manzoor, F. (Lahore Coll. for Women Univ., Lahore (Pakistan). Dept. of Zoology) | Sohail, K. (Khyber Pakhtunkhwa Agricultural Univ., Peshawar (Pakistan). Dept. of Entomology) | Habib, K. (Khyber Pakhtunkhwa Agricultural Univ., Peshawar (Pakistan). Dept. of Entomology) | Sadozai, A. (Agriculture Research Inst., Peshawar (Pakistan). Dept. of Entomology)
The present research work aimed to study the population dynamics of different insect pests of cotton and their natural enemies at the Research Farm of Agricultural University, Peshawar, Pakistan during 2009. Whitefly, Bemisia tabaci (Gennadius); aphids, Aphis gossypii (Glover); leafhopper, Amrasca biguttula biguttula (Ishida); leaf beetle, Cerotoma trifurcate (Forster); red cotton bug, Dyesdercus koenigii (Fabricius) were the major insect pests while ladybird, beetle Coccinella septempunctata (Linnaeus); spider, Dictyna sp. (Linnaeus) and ants, Solenopsis invicta (Buren) were the natural enemies recorded on cotton. Densities of insect pests and natural enemies peaked from June to October. Highest density of 5.78 tabaci per leaf was recorded on 10th August, 2.61 gossypii per leaf on 20th June, 6.56 biguttula biguttula per leaf on 10th August, 0.89 trifurcate per leaf on 30th August and 1.58 koenigii per leaf on 9th October. The highest density of 1.42 C. septempunctata per leaf on 10th August, 0.56 Dictyna sp. per leaf on 19th September and 1.22 invicta per leaf on 20th June were recorded. The pest and natural enemies completely disappeared after mid-October.
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