Effect of Storage Conditions and Duration on the Efficacy of Neem Seeds as an Insecticide

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Date
2015-06-15
Authors
Afag Abd Almouty Mohammed Almahy, Almahy
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Publisher
uofk
Abstract
The experiments were conducted in the Department of Crop Protection, Faculty of Agriculture, University of Khartoum to investigate the effect of storage conditions, storage duration, and grinding on the efficacy of neem seeds as an insecticide. Samples of neem seeds were stored in the sun, refrigerator, and room temperature for two, four and six weeks. These samples were either stored as powder or left as intact seeds.After the respective storage period, a water extract was prepared from each sample and applied topically on the larvae of red flour beetle Tribolium castaneum. A significant mortality percentage (62.83) was recorded in case of treatment with neem seeds stored in refrigerator on the 7th day after the treatment. However, the extract from the seeds stored in the sun resulted only in 48.49% mortality. This is with the exception of 5th day after treatment, where the greatest value of mortality percentage was achieved. The water extract from neem seeds stored at room temperature resulted in significantly high cumulative mortality as compared with the extract from neem seeds exposed to the sun. The highest mortality percentage was obtained by neem seeds stored in the refrigerator (62.83). Both extracts prepared from neem seeds stored in the fridge as powder and intact seeds achieved mortality percentage which was significantly higher than other treatments. The efficacy of neem seeds kept in the sun was negatively correlated with the length of storage period. However, the efficacy was positively correlated with the length of storage period in case of the neem seeds which were stored in the fridge. The greatest cumulative pupation percentage was recorded with highly significant differences in case of treatment with the neem seeds stored in the sun compared with those stored in the fridge and room temperature. Pupation percentage was positively correlated with storage duration in case of the neem seeds stored in the sun. The opposite was true for the neem seeds stored in the fridge.
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Effect of Storage Conditions and Duration on the Efficacy of Neem Seeds as an Insecticide
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