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Effect of some botanicals and table salt against Zabrotes subfasciatus (Coleoptera: Bruchidae) on stored field pea (Pisum sativum L.) grain

  • Elias Zekarias (a1) and Adugna Haile (a2)

Storage pests cause considerable damage to stored grains in Eritrea. A study on storage pest control was conducted at room temperature (25 °C) and 57% relative humidity, to evaluate the efficacy of botanicals and sodium chloride (table salt) against Zabrotes subfasciatus Boheman on field pea (Pisum sativum L.). The experiment was conducted in a completely randomized design (CRD) in three replications. The treatments used were: neem (Azadirachta indica), red pepper (Capsicum frutescens L.), sesame (Sesamum indicum L.) oil, datura (Datura stramonium L.), eucalyptus (Eucalyptus globulus Labill), table salt (sodium chloride) and a control without pesticide. Data collected were weight loss, damage percent and germination percent of field pea grain, and also adult mortality of Z. subfasciatus. Rates of application for all the treatments were 3% w/w and an untreated control. Results of the study showed that E. globulus leaf powder caused 88.89% mortality of Z. subfasciatus and sesame oil caused 100% mortality, three days after treatment. The other treatments were less effective in causing mortality of the insect. After five months of storage, the lowest weight loss was observed in grain treated with sesame oil (1.81%) and neem (4.02%) compared with the control that had 16.68% loss. Grain weight loss was 7.45% for treatment with table salt, 8.11% for eucalyptus, 9.62% for red pepper and 15.29% for datura. Grain damage and weight loss increased as storage time increased. Moreover, these plant materials and table salt had no effect on the germination capacity of field pea. In general, the results obtained indicate that these plant materials and table salt can be used for the control of Z. subfasciatus.

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International Journal of Tropical Insect Science
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