Residue problems in the control of insect pests in processed food commodities using aluminium phosphide
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Date
1984
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Department of Agricultural Entomology, College of Agriculture, Vellayani
Abstract
Investigations were carried out to determine the bio-efficacy of fumigation with aluminium phosphide in controlling different species of insects feeding on stored wheat flour, maida, rice flour, rice, semolina, noodles, cattle feed, gram flour, soy beans, green gram, dhal, coffee, tea, cocoa powder, garlic, pepper and cumin under laboratory conditions at the doses 1.5, 3.0 and 4.5 g/m3 with an exposure period of 3 days. Studies revealed that the dose of 3.0 g/m3 was suitable for effective control of the pests and that the toxicity of the fumigant depended upon the media in which the insects were reared.
Studies conducted on the relative susceptibility of different stages of insects feeding on different food commodities at the 3 doses revealed that adult stage was highly susceptible showing cent per cent mortality evenat the lowest dose of 1.5 g/m^. The egg stage of all the species in all the commodities was relatively resistant to the fumigant followed by pupae, larvae and adults in that descending order. The dose required for the elimination of the different life stages of different insects in different commodities varied depending upon the stage.Thus the percentage control of T. castaneum infesting seven food commodities varied from 92.49 to 100.00 per cent the percentage mortality of the egg ranged from 78*29 to 99.29* of larvae from 97*59 to 100.00 and of pupae from 93.29 to 100.00 per cent at the lowest dose of 1.5 g/m^,S. orvsae also, in three different products showed the same response where the percentage control varied from 93*09 to 97.00. In egg stage the variation in mortality was from 73.55 to 74.81 per cent, in larvae 85.06 to 86.98 per cent and in pupae the variation was from 76.00 to 78.05 per cent at the dose of 1.5 g/m . Similar results were obtained for A. fasoiculatus in three products, C. chinensis on pulses, C. cephalonica on rice flour and L. serricome on cumin.
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