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Articles by M.A. Poswal
Total Records ( 2 ) for M.A. Poswal
  R. Mahmood , M.A. Poswal and A. Shehzad
  Two species Sipha maydis and S. elegans were recorded from Pakistan. First one seems to be restricted to hilly areas of temperate climate and lesser annual rainfall with host range mainly restricted to Gramineae. The wild growing grasses including Phacelurus speciosus, Polypogon fugax, Hordeum murinum and Cynodon dactylon seemed its preferred hosts. In laboratory it did not complete its development on some of the reported hosts like sorghum, maize and Arundo donax. S. elegans was recorded occasionally in small numbers in mixed population with S. maydis on barley, wheat, P. speciosus, H. murinum and P. fugax. It was a first record from Pakistan and seems to be an introduced species. It did not breed well on wheat and barley therefore, it may have some other preferred host not recorded during the present studies. Lysiphlebus ambiguus was the only parasitoid recorded from S. maydis from Pakistan. It did not complete development in other aphids tried including some reported hosts such as Aphis gossypii and Aphis donacis. L. ambiguus is an aggressive parasitoid and its parasitism in field populations of S. maydis exceeded 62%.
  Shafiullah , M.A. Khan , M.A. Poswal , M.A. Rana and Baitullah
  The removal of upper 2/3 and ½ leaves caused a yield reduction of 29 and 55.8 percent in 1992 and 37 and 44.8 percent in 1993, respectively. During 1992, about 1 percent yield decline was observed when the lower 1/3 leaves were removed and 6 percent yield declined with the removal of the lower ½ leaves, while in 1993, the yield reduction was 26.7 and 39.2 percent due to removal of lower 1/3 and ½ leaves, respectively. This indicated that upper leaves (source) contribute more towards sink (seed yield) as compared to the lower ones. Correspondingly, the results indicated that insects and pests feeding on the upper portion of the sunflower plant can cause more reduction in seed yield than the lower leaves.
 
 
 
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