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Asian Journal of Plant Sciences
Year: 2004  |  Volume: 3  |  Issue: 4  |  Page No.: 516 - 521

Microclimatic Morphs and Plant Distribution Analysis of Rhopalosiphum maidis (Fitch) and Schizaphis graminum (Rondani) on Wheat

Ibrar-ul-Hassan Akhtar, Humayun Javed and Abdul Khaliq    

Abstract: Research was conducted at the experimental fields of the Crop Science Institute, National Agricultural Research Centre, Islamabad during winter 2003. Inqilab-91 wheat variety was sown under Randomized Complete Block Design with three replicates. Data were collected through visual count method weekly. Overall aphid morphs distribution of both aphid species was significantly different during season 2003. Population of Rhopalosiphum maidis (Fitch) nymphs peaked to 5.508±1.22 nymphs/plant during mid March. Apterous and alates population peaked 1.293±0.486 and 1.114±0.278/plant, respectively. Morphs population of Schizaphis graminum (Rondani) including nymphs, apterous and alates peaked to 20.853±2.35, 3.516±0.771 and 0.375±0.077/plant, respectively. Corn leaf aphid mean population distribution on leaf, stem and spike was significantly different (F12,103=4.555, P=0.000; F12,103=5.367, P=0.000; F12,103=3.224, P=0.001) and non significant on flag leaf (F12,103=1.138, P=0.340) during crop season. Greenbug mean population distribution on leaf, stem, flag leaf and spike was significantly different (F12,103=12.659, P=0.000; F12,103=4.902, P=0.000; F12,103=7.147, P=0.000; F12,103=3.254, P=0.001) during 2003, respectively.

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