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Articles by Ibrar-ul-Hassan Akhtar
Total Records ( 3 ) for Ibrar-ul-Hassan Akhtar
  Ibrar-ul-Hassan Akhtar , Humayun Javed and Abdul Khaliq
  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.
  Ibrar-ul-Hassan Akhtar and Abdul Khaliq
  Research was conducted to determine the effect of Coccinellid predators and plant phenology on the population dynamics of Macrosiphum rosaeiformis Das (Aphididae: Homoptera) in the University of Arid Agriculture Rawalpindi from 5th November 2000 to 15th April 2001. The rose aphid population was peaked in the month of January 2001. Rose aphid population was negatively correlated with Coccinellids predators. Rose aphid preferred the tender portion of plant especially flowers and flower buds causing deformation and discolouration. The resistance of four varieties i.e. Ice White, Sarabande, Lake Como and Iceburg (Rosa indica: Rosaceae) was studied against rose aphid. None of variety had resistance against rose aphid to significantly reduce their population.
  Ibrar-ul-Hassan Akhtar and Muhammad Aslam
  Research was conducted to determine the preference and non-preference behaviour of red flour beetle against wheat, rice, paddy and sunflower crushed grains under laboratory conditions in university of Arid Agriculture Rawalpindi, Pakistan during 2000. In the antixenosis experiment, the red flour beetles were observed at 24 h interval. Red flour beetle had shown highest preference to rice crushed grains with mean 9.2500±1.8875, medium preference to paddy crushed grains with mean value 5.2500±2.7500 and least preference to wheat and sunflower with mean value 1.5000±0.5000 and 1.5000±0.8660 respectively.
 
 
 
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