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Articles by S. A. Kakakhel
Total Records ( 3 ) for S. A. Kakakhel
  Muhammad Younis Jatoi , Humayun Javed and S. A. Kakakhel
  The experiment on relative resistance and susceptibility among 22 cultivars of Brassica napus was laid down and it was observed that cultivars shiralee and hybrid were susceptible to turnip aphid, while the other cultivars were resistant or partially resistant to turnip aphid at leaf stage. The cultivars crusher, hybrid and shiralee were highly susceptible at flowering and the cultivars sponser, deffender, shiralee and cyclone were highly susceptible at seed formation and the oscer and cyclone were susceptible at seed maturity stage. As a whole the cultivar shiralee was highly susceptible while the cultivars hybrid, cyclone, RNB-9604D, deffender and oscer were intermediately susceptible. Similarly the cultivars sponser, CON-III, crusher, KS -75, BULLT, 19-H, dunkled and BLN-971 were partially resistant and the cultivars Yol-9, rainbow, CON-I, CON-II, CCS-01 and BLN-877 showed relative resistance among all 22 cultivars of Brassica napus against turnip aphid, Lipaphis erysimi Kalt.
  S. A. Kakakhel , S. K. Khalil and Ahmad Jan
  None of the twenty five varieties of sugarcane tested were completely resistant to the attack of stem and root borers. They were grouped into three categories based on the borer infestation: (A) fairly resistant (CP 77/400, US 59/161, CP 67/417, Mex 56/1324 and PSA 132) which showed an overall lower infestation of 8.25-12.30 per cent. All these varieties gave a very good yield (68-88 tons ha -1) cane yield, (8-11.73 tons ha -1) sugar yield and 11.75-13.26 per cent commercial cane sugar (CCS), except CP 67/417 which gave a poor yield, (B) moderately resistant with 13.24-18.96 per cent borer infestation. In this group cvs. Mex 54/81, CP 70/1133, CP 67/37, CP 75/1082, CP 72/1215 and CP 70/1527 gave a cane yield of 68 tons ha -1, 8.63-10.73 tons ha -1 sugar and 11.25-13.50 per cent CCS and (C) susceptible group included N 50/21, CP 70/1547, CP 71/1086 and CP 66/473 showing an infestation of 19.96-28.30 per cent with poor yields, except CP 70/1547 which gave comparatively better. Root borer showed maximum infestation compared to stem borer among the tested varieties.
  M. Amjad , N. Islam and S. A. Kakakhel
  The biology of turnip aphid apterous (Lipaphis erysimi Kelt.) was studied in controlled conditions on four cultivars of Brassica viz, B. campestris (Toria-A), B. carinata (Peela raya), B. juncea (Bard-1) and B. napus (Wester). Four nymphal instars were observed. The first stadium was the shortest on B. juncea and longest on B. campestris. Stadia for 2nd, 3rd and 4th instar ranged between 17-23, 20-24 and 29-31 hours, respectively. The reproductive time was the shortest on B. campestris and fecundity was at par with other cultivars of Brassica. The pre and post-reproductive times were not significantly different and ranged from 16-22 and 17-22 hours, respectively. The developmental time was approximately six days. The reproduction was significantly high on B. campestris and B. napus leading to higher intrinsic rate of increase on B. campestris than B. juncea and B. carinata.
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