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Articles by Idrees Ahmad Nasir
Total Records ( 2 ) for Idrees Ahmad Nasir
  Tauqeer Ahmad , Muhammad Saeed Ahmad , Idrees Ahmad Nasir and Sheikh Riazuddin
  The ability of explants of gladiolus cv White Prosperity to form plantlets and cormlets was investigated in vitro studies. Maximum production of shoots per explant was obtained on basal medium of Murashige and Skoog (1962) containing 18 μM 6-Benzylaminopurin (BAP) and 36 μM Indole-3-butyric Acid (IBA). Callus formation was observed when in vitro cultures were maintained for 16-18 weeks. When different explants were used for their response to regenerate, maximum number of shoots per culture was achieved from nodal buds. In order to allow initiation of root formation, the shoots were transferred to one half strength Murashige and Skoog medium containing 2.5 μM, Naphthalenacetic Acid (NAA) or 19 μM Indole -3-butyric Acid (IBA). Roots developed readily within 4-5 weeks on either of the two media. However, all plantlets grew with better survival in medium containing NAA as harmonal supplement than in media containing IBA. Further MS medium containing 6 percent sucrose facilitated maximum growth of cormlets to allow their use as propagation material in vivo.
  Ahmad Usman Zafar , Shahid Karim , Idrees Ahmad Nasir and Sheikh Riazuddin
  Previous lab report (Karim et al., 1999) had shown the efficacy of CAMB Bacillus thuringiensis preparation in potato field to control Helicoverpa armigera. In present study, CAMB Bt formulations based on locally isolated Bt strain were checked against 1st to 4th instar larvae of H. armigera by incorporating Bt proteins into artificial diet. Early instars showed significant susceptibility to Bt formulation. Laboratory assays of stored CAMB Bt formulations did not show any significant change in their toxicity towards H. armigera larvae in laboratory assays. Potency of stored Bt formulations for 12 and 24 months were also tested in small scale experiment conducted under contained conditions on tomato crop. All formulations were found effective to control H. armigera larvae in tomato crop. The present study shows that CAMB Bt formulation can be used in field applications to control target pests after long storage time.
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