Abstract
Fumigant toxicity and repellent activity of Toddalia asiatica (L.) Lam. (Rutaceae) leaf and fruit extracts were screened against Callosobruchus maculatus (F.), Sitophilus oryzae (L.) and Tribolium castaneum (Herbst) adults. All the three solvent extracts of leaf and fruits recorded mortality and repellency against the three tested insects in a concentration dependent manner. C. maculatus was the most susceptible pest to the treatments. Lethal concentrations for 50 percent mortality (LC50) of C. maculatus, S. oryzae and T. castaneum were recorded as 39.19, 44.13 and 61.10 μL/L, respectively. Diethyl ether fruit extract exhibited 100% repellent activity against C. maculatus and S. oryzae and 92% against T. castaneum adults at 20 μL concentration. These results suggested that Diethyl ether fruit extract of T. asiatica can be used as an ecofriendly fumigant and repellent against C. maculatus, S. oryzae and T. castaneum.
Highlights
Agricultural products including animal and plant products are stored in different types of storage structures for future consumption or trade purposes
In the present study the fumigant toxicity and repellent activity of hexane, diethyl ether and methanol extracts of T. asiatica leaves and fruits were studied against C. maculatus, S. oryzae and T. castaneum
The highest toxicity was recorded in diethyl ether extract of fruit at all concentrations against the three insects tested
Summary
Agricultural products including animal and plant products are stored in different types of storage structures for future consumption or trade purposes. During storage these products are damaged by pest organisms among which insects are the most serious. Volatile oils and compounds have been reported as effective fumigants and repellents against many stored product pests [10,11,12]. It is commonly called Wild orange tree or Forest pepper. In the present study the fumigant toxicity and repellent activity of hexane, diethyl ether and methanol extracts of T. asiatica leaves and fruits were studied against C. maculatus, S. oryzae and T. castaneum
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