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Articles by T.S. Syed
Total Records ( 4 ) for T.S. Syed
  T.S. Syed and G.H Abro
  Different bracissca vegetables such as Brassica oleracea botrytis, B. oleracea capitata, B oleracea italica, B. napus, B. compestris, B. chenisis perkensis and Raphanus sativa were provided to newly hatched larvae of Plutella xylostella. The shortest and longest larval period of 9.45 and 10.95 days were recorded on B. oleracea botrytis and Raphanus sativa, respectively. Percent larvae pupating did not differ significantly, the lowest and highest percent survival to adult stage was recorded 58.3 and 76.7% on B. napus and B. oleracea italica. Whereas shortest and longest pupal period was recorded as 6.48 and 5.84 days on B.napus and B.oleracea capitata fed larvae. Pupal mass and fecundity of female showed that highest pupal mass and fecundity was recorded on B. oleracea fed larvae as compared to other Brassica vegetable crops. Similarly P. xylostella females preferred to lay more eggs on B.oleracea botrytis as compared with other hosts. Result also showed that females preferred to lay eggs on lower side as compared to upper side of the leaves. The life table parameters showed that net reproductive rate (Ro), was highest (89.71) when P.xylostella fed on B. olaracea botrytis, while the lowest Ro value of 26.77 was recorded when larvae were fed on B. napus. The intrinsic rate of increase (rm) and finite rate of increase (erm) were highest and lowest on B. olaracea botrytis and B.compestris, respectively.
  T.S. Syed , G.H. Abro and S. Ahmed
  In this study different insecticides were tested under field condition on cabbage, Brassica oleracea capitata and cauliflower, Brassiaca oleracea botrytis at vegetable fields of TandoAllhayar, Dist Hyderabad. Pretreatment observations were recorded one day before treatment and post treatment after 96 h and seven days interval in first and second sprays, respectively. Avermectin was most effective when applied on cabbage in first and second sprays against diamond back moth, where as, Bacillus thuringiensis and spinosad remained effective in both sprays after 96 h and seven days interval, on cauliflower compared with other insecticides. It was concluded that Bacillus thuringiensis, avermectin and spinosad were more effective compared with other insecticides tested in the present study.
  T.S. Syed , G.H. Abro , R.D. Khuhro and M.H. Dhauroo
  Field studies were carried out to investigate the relative resistance of twenty cotton varieties against sucking pests, that is Jassid, Amrasca devastans Dist., Thrips, Thrips tabaci Lind., Whitefly, Bemisia tabaci (Genn.) and mite, Tetranychus spp. The results indicated that the highest A. devastans population of 2.72 insect leaf–1 was observed on Greg-25V variety, while the lowest population was found on variety Rajhans (2.06 insect leaf–1), while the highest and the lowest thrip population of 4.28 and 2.21 insects leaf–1 were observed on Empire WRD and Rode okra respectively. Similarly, the highest and lowest population of B. tabaci were found on Rehmani and Greg-25V as 1.99 and 1.73 insects leaf–1 respectively. Whereas in case of Tetranychus spp. the highest and lowest population noted as 3.23 and 1.71 on Rajhan and Coker-8316, BW-673, Rode okra, Genetic male sterile, Russian red leaf, Rehmani, TH-1100 and TH-1174, varieties.
  G.H. Abro , T.S. Syed and Z.A. Dayo
  Studies were carried out on varietal resistance of cotton against Earias spp. during cropping season 1999. The seeds of 12 cotton varieties viz., Green Red Okra, Qalandri, Red Okra-VI, Red Okra (Insect Resistant), AENS-1/82 VIII, Red Okra, TH-228/87, AENS-10/87, TH-3/83, Reshmi, AEC-78 13/89 and TH-41/83 were sown on April 22, 1999 in a completely randomized design with strip cropping, each strip measuring 20 x 35 feet with nine rows of each variety. Observations on infestation of Earias spp. were started 67 days after sowing and continued till complete disappearance of pest from the crop. Observations were taken at random at weekly interval from 20 plants. The results revealed that there was no significant difference of infestation amongst cotton varieties under present investigation. The minimum and the maximum infestation of 1.79 and 2.38% was recorded on Red Okra-VI and Green Red Okra varieties of cotton, respectively. The results also indicated that there was no significant effect of minimum and maximum temperature on percent infestation of Earias spp., whereas relative humidity had a significant (P<0.05) effect on infestation.
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