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Articles by Ibrar-ul-Hassan Akhtar
Total Records ( 2 ) for Ibrar-ul-Hassan Akhtar
  Tariq Mustafa , Humayun Javed and Ibrar-ul-Hassan Akhtar
  The present research was conducted on ten different genotypes of sunflower against white fly, semilooper, plant hopper and flea beetle in research field of NARC, Islamabad during 2002.Genotypes resistance was only observed for plant hoppers. All genotypes of sunflower supported same level of resistance to white fly, semilooper and flea beetle. Insect`s pest complex shows variable response to physico-morphic characters of sunflower genotypes. White fly was positively correlated with dry weight, plant hair density, leaf area, plant height and negatively correlated with fresh weight of genotypes. Plant hopper population was positively correlated with dry weight, plant hair density and negatively correlated with fresh weight, leaf area and plant height of genotypes.Semiloooper population was positively correlated with fresh weight, leaf area and negatively correlated with dry weight, plant hair density and plant height of genotypes. Flea beetle was positively correlated with fresh weight, plant height and negatively correlated with dry weight, plant hair density and leaf area of sunflower genotypes. Impact of environmental factors including temperature, humidity and rainfall were variable on insect`s pest complex of sunflower. Impact of rain fall was maximum with range of 0-48% followed by temperature 0-28% and humidity 0-20% on insect`s pest complex of sunflower.
  Ibrar-ul-Hassan Akhtar , Humayun Javed and Abdush Shakoor
  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 morphs distribution of all three species of aphid was significantly different during season 2003 on week basis (F12,103 = 26.052, P=0.000; F12,103=9.084, P=0.000; F12,103=9.307, P=0.000). Population of cereal aphid’s nymphs peaked to 38.005±1.904/plant during 11th week in March. Apterous population was peaked to 1.800±0.22/plant during 4th week in January and secondly peaked in 11th week in March (7.264±1.296/plant). Alates were peaked to 3.821±1.04/plant in 4th week in January. Cereal aphid morphs distribution showed highest percentage of nymphs (72.8%) > apterous (16.7%) and alates (10.6%). Cereal aphids preferred the leaf part (72.2%) of plant followed by spike (16.3%), flagleaf (5.9%) and stem (5.5%), respectively.
 
 
 
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