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Articles by Ali H. Sayyed
Total Records ( 3 ) for Ali H. Sayyed
  Munir Ahmad , Mushtaq Ahmad Saleem , Mushtaq Ahmad and Ali H. Sayyed
  To determine time trends in mortality for various insecticides, which are being used against cotton pests, the fourth instar larvae of Spodoptera litura was collected from Muzaffar Garh and tested for pyrethroids, organophosphate and new chemistry insecticides. The efficacy of the insecticides was examined by time-oriented mortality at LC50, through leaf-dip bioassays in the laboratory. In sodium channel agonists, endosulfan was the most efficient insecticide. The cholinesterase inhibitors tested, chlorpyrifos showed high efficiency while phoxim performed better in time-oriented mortality. Emamectin benzoate proved to be the most efficient insecticide in new chemistry insecticides tested. Spinosad and indoxacarb had almost similar LC50 and LT50 values. The least effective insecticide found was abamectin. The results are discussed in relation to Integrated Pest Management (IPM).
  Ali H. Sayyed , Mohsin R. Rizvi and Anwaar H. Alvi
  The diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae) is the greatest threat to crucifer through out the world including Pakistan, sometime causing more than 90% crop loss and estimated cost over US$ 1 billion annually. Prior to the introduction of synthetic insecticides diamondback moths were never reported as the major pests of crucifers, however with widespread use of synthetic insecticides on crucifer important natural enemies were eliminated which led to continue use of synthetic insecticides and eventual insecticide resistance and control failure. This review provides a global overview of the biology and ecology of diamondback moth including past, present and perspective future management strategies with special reference to Pakistan.
  Ali H. Sayyed and Denis J. Wright
  The bacterium Bacillus thuringiensis is the main source of insecticidal proteins in insect resistant plants. However, biochemical and genetic studies have shown that insect resistance to B. thuringiensis (Bt) toxins can occur and with the advent of Bt transgenic crops this is a major concern. Several insect species have shown resistance to these toxins in the laboratory but the diamondback moth, Plutella xylostella is the only species which has evolved resistance under field conditions to date. Many studies have been done to elucidate the mode of action of the toxins and the mechanisms and genetics of resistance. In this article Bt toxins, their mode of action, mechanisms and genetics of resistance and management strategies for delaying resistance are reviewed. The emphasis is placed on examining the presently recommended high dose/refuge strategy.
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