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Articles by Humayun Javed
Total Records ( 6 ) for Humayun Javed
  Muhammad Younis Jatoi , Humayun Javed and S. A. Kakakhel
  The experiment on relative resistance and susceptibility among 22 cultivars of Brassica napus was laid down and it was observed that cultivars shiralee and hybrid were susceptible to turnip aphid, while the other cultivars were resistant or partially resistant to turnip aphid at leaf stage. The cultivars crusher, hybrid and shiralee were highly susceptible at flowering and the cultivars sponser, deffender, shiralee and cyclone were highly susceptible at seed formation and the oscer and cyclone were susceptible at seed maturity stage. As a whole the cultivar shiralee was highly susceptible while the cultivars hybrid, cyclone, RNB-9604D, deffender and oscer were intermediately susceptible. Similarly the cultivars sponser, CON-III, crusher, KS -75, BULLT, 19-H, dunkled and BLN-971 were partially resistant and the cultivars Yol-9, rainbow, CON-I, CON-II, CCS-01 and BLN-877 showed relative resistance among all 22 cultivars of Brassica napus against turnip aphid, Lipaphis erysimi Kalt.
  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.
  Mubashir Hussain and Humayun Javed
  The study was conducted to determine the effect of 0.2% N with different doses (0.025, 0.05, 0.075, 0.1, 0.125 and.1.50%) of ascorbic acid on growth and silk production of larvae. Larvae were fed on mulberry leaves treated with 0.2% N and ascorbic acid in various combinations. Data was recorded on food consumption, co-efficient of utilization, body weight, body length and cocoon shell ratio and analyzed statistically. It was revealed that T5 (0.2%N +0.05% vitamin C) proved as the best treatment, which yield better results than all other test treatments about all the parameters under study. In conclusion, the higher doses of vitamin C, lowered the silk yield and caused decline in growth of silkworm larvae.
  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.
  Muhammad Afzal and Humayun Javed
  The replacement of plastic traps with wooden blocks soaked in lure mixed with insecticide was assessed. Blocks are cheaper, simple and less likely to be blown down or stolen compared with plastic traps. Square and oblong are more effective against round and hexagonal. Plywood is best for block construction. About 92 % flies caught were Bactrocera zonata Saunders and the remaining was B. dorsalis Hendel. Incase of mixture composition, 6:4:1 is more important than other ratios. Spacing of 20 m between blocks appeared to be optimal, so it could be recommended 10-blocks / acre.
 
 
 
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