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Articles by K. Ahmed
Total Records ( 3 ) for K. Ahmed
  K. Ahmed , F. Khalique and B. A. Malik
  The study was conducted to determine the effectiveness of application of Bacillus thuringiensis commercial formulation for the control of Helicoverpa armigera (Hbn.) on highly acidic chickpea plant. Dosage-mortality response of neonate larvae of H. armigera due to feeding on HD-1-S-1980 and malic acid alone or combinations of both incorporated in the artificial diet were assessed. Significant synergistic interactions were observed in most of the combinations of HD-I-S-1980 with malic acid (from 1.00-4.00% concentrations.). Slopes of regressions upto 4.00% malic acid + HD-I-S-1980 combinations were steeper than HD-I-S-1980 alone . The LC50 of HD-I-S-1980 decreased with 1.0, 2.0, & 4.0 % malic acid. Potency of HD-I-S-1980 was increased by 0.4, 2.7, and 12.89 folds in 1.0, 2,0, and 4.0 % malic acid combinations respectively. The dosage-mortality responses of the noctuid, H. armigera to combination treatments of the US reference standard (HD-I-S-1980) with malic acid enhanced the effectiveness of the bacteria. The study can prove to be helpful when applying Bt on chickpea to control lepidopterous pests in field.
  Muhammad Iqbal , K. Ahmed , I. Ahmad , M. Sadiq and M.Y. Ashraf
  The effect of water stress on yield and yield components of two durum wheat varieties was studied at various growth stages, i.e. at vegetative, flowering or grain-filling stage and no stress (control). The decrease in grain yield per plant was more pronounced (72.62 percent) associated with a reduced number of grains per ear (59.62 percent) and 1000-grain weight (31.98 percent) under water stress applied at flowering stage. Stress at grain-filling stage was less effective than at vegetative and flowering stage in both varieties. Variety D-88628 was less affected which showed its adaptability under water stress conditions.
  F. Khalique and K. Ahmed
  Compatibility and synergism of Bacillus thuringiensis commercial formulation and lambda-cyhalothrin were evaluated for the control of Helicoverpa armigera (Huebn.). Concentration-mortality response of 3rd instar H. armigera larvae due to B. thuringiensis Berliner subsp. kurstaki (Costar WP) and lambda-cyhalothrin (Karate 2.5 EC) alone and in combination with various concentrations incorporated in artificial diet was assessed. Combinations of low dosage of lambda-cyhalothrin and Costar (B.t.k.) formulations were found highly compatible and synergistic. In combination treatments (Costar+karate LC0, Costar+karate LC10 and Costar+karate LC25), the LC50s of Costar underwent 1.3, 3.4 and 3.4 fold reductions respectively. Further laboratory test and field trials of B. thuringiensis var. kurstaki supplemented with other chemical insecticides against chickpea pod borer are warranted.
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