University of Khartoum

Efficacy of Selected Plants Extracts on the Control Of Khapra Beetle Trogoderma granarium Everts (Coleoptera – Dermistidae) and RED Flour Beetle Tribolium castaneum Herbst(Coleoptera – Tenebri

Efficacy of Selected Plants Extracts on the Control Of Khapra Beetle Trogoderma granarium Everts (Coleoptera – Dermistidae) and RED Flour Beetle Tribolium castaneum Herbst(Coleoptera – Tenebri

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Title: Efficacy of Selected Plants Extracts on the Control Of Khapra Beetle Trogoderma granarium Everts (Coleoptera – Dermistidae) and RED Flour Beetle Tribolium castaneum Herbst(Coleoptera – Tenebri
Author: Mohamed, Nawal Mohamed Ali
Abstract: The potential usage of the powders and the extracts of hexane and methanol of Neem Azadirachta indica A. Juss., seeds and leaves, Laloub Balanitas aeggptiaca (L.) Del., seeds and kernels and Rehan Ocimum basilicum L., leaves and seeds as pest control agents were tested under laboratory conditions against two insects species of stored grains, Trogoderma granarium Everts. (Coleoptera – Dermistidae) and Tribolium castaneum Herbst. (Coleoptera – Tenebrionidae). Evaluations were based in the insecticidal activities of the tested plant extracts. The 1st and 4th larval instars and the adult stages of T. granarium and T. castaneum were exposed separately to (0, 1, 2, 4 and 5 grams) of plant parts powders, extracts and the insecticde primiphos as (Actellic 50% EC) as standard. The percent of mortalities of the insects due to Laloub kernels’ pwoders, showed 100% of the adult stage of T. granarium at all concentrations after 14 days. However lower mortalities were recorded for the of 1stand 4th larval instars and adult stages of T. castaneum at the above concentrations and days. Laloub kernels hexane extracts showed 100% mortality of the 1st larval instar and adult stage of T. granarium and T. castaneum after 14 days at all concentrations, while the 4th larval stage showed less percentage mortalities. Rehan leaves’ and seeds’ powders and extracts recorded low mortalities on the two tested pests compared to the other plants. Rehan leaves’ powder were more effective than Rehan seeds on the two species. Rehan leaves hexane extracts gave 100% mortality of the 1st larval instar and adult stages of T. granarium at all concentrations and after 14 days a lower mortality percentage was recorded for the 4th larval stage at the same concentrations and period. Methanol extracts recorded lower mortalities, compared to that of hexane extracts for the same stages, observation period and concentrations. Rehan leaves hexane extracts resulted in100% mortality of the 1st and 4th larval instars and adult stages of T. castaneum at the higher concentrations (4 and 5%) after 14 days. The mortality in any one insect stage increased with the increase of the concentrations of the tested plant powders. In all treatments, the percent mortality was highest in the first instar, gradually decreased in the 4th instar and increased again in the adult stage. The toxicity of Neem seeds’ powders on the 1st and 4th larval instars and adult stages of T. granarium was higher than that of the other tested materials and slightly lower when the larvae (compared to adults) of the same species were exposed to the same concentrations of Neem leaves in the same period. In all concentrations of Neem seeds and leaves extracts tested, the percent mortalities recorded for the adults were higher than those of the 1st and 4th larval instars. The mortalities of the adult stage exposed to Neem seeds hexane extracts were higher (100%) than those recorded for the same concentrations, days and stages of T. granarium which were exposed to the Neem leaves hexane extracts. Methanol extracts recorded lower percent mortality. The percent mortalities of the 1st and 4th larval instars and adult stages of T. castaneum exposed to Neem leaves hexane and methanol extracts were lower compared to those of T. granarium The percent mortality of the adult of T. granarium exposed to Laloub seeds’ powders and hexane extracts, were 100% after 14 days. Also the 1st and 4th larval instars recorded complete mortality when exposed to Laloub seeds hexane extracts after the above mention days. While its powder recorded lower mortalities. Methanol extracts showed similar results on the previous stages. The mortalities decreased when the larval instars and adult of T. castaneum were exposed to Laloub seeds’ powders and extracts compared to that of T. granarium stages exposed to Neem leaves. While the 4th larval instar came last compared to the other stages. Also the frequency of the percent mortalities varied with the concentrations, days and stages of T. castaneum. The percent mortalities for 1st and 4th larval instars and adult stages of T. granarium exposed to Rehan seeds’ hexane extract at (4 and 5%) concentrations and after 14 days, were higher compared to those of methanol extracts at the same concentrations, stages and days. Lower mortalities of the 1st and 4th larval instars and adult stages of T. castaneum were recorded compared to those of T. granarium at the same concentrations, stages and days. The insecticide primiphos as (Actellic 50% EC) recorded higher percent mortality (100%) at all concentrations on the 1st and adult stages of T. granarium and adult stage of T. castaneum after 24 hours, while the 4th larval stage recorded lower mortality. The toxicity decreased progressively from the adult to the 1st larval stage, and it was lower on the 4th larval stage
Description: June 2003
URI: http://khartoumspace.uofk.edu/handle/123456789/10479
Date: 2015-05-11


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