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Articles by Ahmad Usman Zafar
Total Records ( 2 ) for Ahmad Usman Zafar
  Ahmad Ali Shahid , Idrees Ahmad Nasir , Ahmad Usman Zafar , Aleena Sumrin , Bushra Chaudhry and Sheikh Riazuddin
  The biopesticides based on fungus Metarhizium anisopliae and bacteria Bacillus thringiensis (Bt) were used on stem borer and leaf folder of rice, which have reduced the population of these pests effectively both in laboratory and in the field. In laboratory bioassays CAMB biopesticides were very useful on insect larvae of Helicoverpa armigera. By using the combination of fungal and bacterial formulation the increase in mortality was studied and it was 100% after 96 h. In the field trials a significant effect on stem borer and leaf folder was observed. On the basis of these results, biopesticides can safely be recommended for the control of rice pests with no harmful effect on its predators as in case with chemical pesticides.
  M. Zia-ur-Rehman , Ahmad Usman Zafar , Idrees Ahmad Nasir and Shiekh Riazuddin
  Three Bacillus thuringiensis biopesticides were sprayed at their recommended rate against cotton bollworms, which have controlled these pests effectively both in lab and field trials. In the lab CAMB-Bt was found the best biopesticide giving 100% mortality with in 48hrs against spotted bollworms. Similarly Lepinox-Bt gave 100% mortality against spotted bollworm. However it was least effective against American bollworm with less than 60 % killing. Comparatively Larvo-Bt gave ≤ 20% mortality against both the insects. There were made 3 sprays of Bt on cotton crop. In the field four days after each spray CAMB-Bt rank Ist by giving (65, 34 and 32%) mortality. While second was Larvo-Bt giving (62, 28 and 30%). Lepinox-Bt ranked 3rd (53, 2 and 26%). After three sprays the residual efficacy of CAMB-Bt was (55, 26 and 15%) followed by Larvo-Bt having (26, 29 and 13%) mortality. While Lepinox-Bt has (49, 3 and 1%) mortality as compared to control (11, 14 and 7.5%).The results suggests that CAMB-Bt is more effective than imported Bt formulations.
 
 
 
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