University of Khartoum

Evaluation of The Fumigant Action of Garlic (Allium sativum) Oil Vapor Against Some Major Stored Product Pests

Evaluation of The Fumigant Action of Garlic (Allium sativum) Oil Vapor Against Some Major Stored Product Pests

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Title: Evaluation of The Fumigant Action of Garlic (Allium sativum) Oil Vapor Against Some Major Stored Product Pests
Author: Abdalla, Mahgoub Ishag
Abstract: Various experiments were carried out under laboratory conditions to investigate the efficacy of the fumigant action of garlic volatile oil in small (200 g) cups and jute sacs (100 g). Test insects included Collasobruchus maculatus (adult), Rhyzopertha dominica (adult), Tribolium castaneum (adult and larvae) and Trogoderma granarium (larvae). Fumigation was carried out for short exposure period (6-48 hrs) as well as over medium (3-15 days) and longer exposure period (15-60 days). The investigation was also extended to cover the evaluation of the effects on the loss in quality and quantity of the stored commodities. Results of the short exposure period (6-48 hrs) indicated that garlic oil was effective and caused significant death (after waiting recoveries for seven days) to the test insects in cups (at conc. 0.1-20%). Effects were dosage related. C. maculatus was found to be the most sensitive species followed by R. dominica (adult), T. castaneum (adult) and T. castaneum (larvae). C. maculatus was found highly sensitive to garlic fumigation, 100% kill occurred within 24 hrs exposure period, and therefore its exposure was maintained within this period for further sacs tests, while for other test insects efficacy was tested over medium (3-15 days) and long (15-60 days) exposure periods. Recovery cases noticed were negatively related to the dosage. Evaluation of the efficacy of fumigation at medium exposure period (3-15 days) in sacs showed that vapor from garlic oil can penetrate through jute sacs and can exert significant death to T. castaneum (adult), R. dominica (adult) and T. granarium (larvae) as compared to control. Effects were dosage related. The following over all order of sensitivity R. dominica (adult) > T. castaneum (adult) > T. granarium (larvae) was noticed. Re-evaluation of efficacy of fumigation against the same test insects (R. dominica (adult), T. castaneum (adult), T. granarium (larvae)) but at much lower concentration of garlic oil (0.001 – 1%) and over longer exposure period (15 – 60 days) in sacs gave same order of sensitivity outlined earlier; R. dominica (adult) > T. castaneum (adult) > T. granarium (larvae). Effects were also dosage related. Garlic fumigation was also found to reduce the rate of increase in population of the test insects [R. dominica (adult), T. castaneum (adult), T. granarium (larvae)] over prolonged storage (15-60 days). Garlic oil fumigation was found to cause significant reduction in weight loss and significant improvement of quality of stored products. Also garlic oil fumigant doesn't negatively affect the viability of the stored grains. It is expected low mammalian Toxicity (being a common table spice), availability, simplicity of application adds more to its merrits
Description: 2003287 page287 page
URI: http://khartoumspace.uofk.edu/handle/123456789/10355
Date: 2015-05-06


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