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Articles by T.S. Syed
Total Records ( 4 ) for T.S. Syed
  G.H. Abro , T.S. Syed , G.M. Tunio and M.A. Khuhro
  Studies were carried out to investigate insect infestation on transgenic Bt and non-Bt cotton varieties and genotypes. The seeds of seven cotton varieties, viz., KMG-1, KMG-2, KMG-3, MS-1, MS-2 NIAB-78 and CRIS-134 were sown on May 15, 2002 in a completely randomized block design. The study comprised laboratory bioassay and field screening of different varieties and genotypes. Laboratory study indicated that transgenic Bt cotton was highly toxic to Earias vittella causing 100% larval mortality. While armyworm, Spodoptera exigua was tolerant, its mortality ranged between 13.3 to 53.3% on different varieties and genotypes. The results of field study revealed that the highest mean population (1.66 insect per leaf) of jassid was recorded on KMG-3 followed by 1.95 and 1.52 insects leaf on KMG-2 and KMG-1, respectively. Whitefly population ranged between 1.47 and 1.52 insects leaf on different varieties and genotypes. Whereas, thrips population remained fluctuating in different varieties and genotypes during the crop growth period. But genotypes like KMG-1, KMG-2 and KMG-3 which are crosses of Bt cotton and non-Bt cotton varieties were found harboring more thrips population. The larval population of spotted bollworm, Earias spp. indicated no infestation and live larvae were found on MS-1 and MS-2 varieties of Bt cotton. Maximum infestation of spotted bollworm was recorded on NIAB-78 (0.97 larva per plant) followed by other varieties and genotypes.
  A.J. Memon , G.H. Abro and T.S. Syed
  The present study on the varietal resistance of okra against Earias spp were carried out at the experimental farm, Sindh Agriculture University, TandoJam, for two years (1997 and 1998). For recording pest infestation, five plants per treatment were thoroughly observed from one month after sowing and continued till harvesting. Healthy and infested fruits were noted at weekly intervals. Okra varieties tested in the present study were: Jalandri, Green polo, Parbhani karanti, Pusa sawani, Faisalabad-M-1 and Desi. The results revealed that infestation varied significantly in different varieties of okra. The okra varieties Green polo was found the least susceptible and the Desi variety was the most susceptible with the minimum and maximum percent infestation of 9.06 and 18.92, respectively.
  G.H. Abro , T.S. Syed , M.A. Unar and M.S. Zhang
  Studies were carried out on the effect of hormone and micronutrients on plant growth and insect infestation of cotton crop under field conditions. Cotton (TH-3/83) was sown in randomized block design with four replications on May 15, 2001. Planofix (plant growth regulator) and two micronutrients (Bonus Non-chelated and Bonus chelated) were applied on August 20, 2001 and two subsequent applications were made at weekly intervals. The results indicated that there was significant effect of application of hormone and micronutrients on plant height, number of fruiting bodies (bolls), volume of bolls and yield in comparison to control. There was no significant effect of application of hormone and micronutrients on multiplication of thrip, Scirtothrips dorsalis, Jassid, Amrasca devastans, Whitefly, Bemisia tabaci and percent infestation of bollworms. However, application of plant growth regulator and micronutrients significantly delayed the maturity of cotton.
  G.H. Abro , A.J. Memon , T.S. Syed and A.A. Shaikh
  Studies were carried out to investigate the effect of growing of cotton and okra as mono and mix crops or polycultures on percent infestation of Earias spp. on cotton and okra under field conditions. The results revealed that Earias spp. infestation on okra appeared about 45 days after sowing of the crop; whereas, on cotton the pest appeared atleast one month later than it appeared on okra. Two years data indicated a highly significant (F=14.36; DF = 6, 3, P<0.01) difference in percent infestation of Earias spp. on different mono and mix crops of cotton and okra. The highest Earias spp. infestation (18.45%) was recorded on okra grown as mono crop followed by okra mix, cotton mono crop and cotton mix crop with percent infestation of 10.29, 5.97 and 3.90, respectively. It was concluded that okra could be used as a trap crop for the population management of Earias spp. in cotton crop.
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