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Journal of Entomology and Zoology Studies
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ISSN Print: 2349-6800 | ISSN Online: 2320-7078

Journal of Entomology and Zoology Studies

2016, Vol. 4, Issue 5
The lethal effects of three insecticides Deltamethrin, Cypermethrin and Chlorpyrifos against adult stage of alfalfa weevil, Hypera postica Gyllenhal (Col.: Curculionidae)

Sevda Dadrass, Shahram Mirfakhraie, Shahram Aramideh and Mohammad Hassan Safaralizadeh

Alfalfa Medicago sativa L. is an economic crop with a great number of natural or invasive pest species mainly from the Curculionoidea superfamily. The alfalfa weevil, Hypera postica (Gyllenhal) (Col.: Curculionidae), is a major pest of alfalfa. In this research, three insecticides Deltamethrin, Cypermethrin and Chlorpyrifos were evaluated for their efficacy in the control of adult stage of H. postica under field conditions. The LC25 and LC50 values of Deltamethrin, Cypermethrin and Chlorpyrifos were estimated on adult insect. Furthermore, LC25 and LC50 values for Deltamethrin, Cypermethrin and Chlorpyrifos on adult insects were 838.52, 44.52, 994.00and1443.14, 408.93, 341.50 ppm for 24 hours and 520.6, 125.148, 198.74and 1046.87, 31.24, 545.79 ppm for 48 hours, respectively. According to LC50 values after 24 and 48 hours Chlorpyrifos and Cypermethrin with the least value can be suggested as the most potent insecticide. To evaluate effects of three insecticides, one experiment with completely randomized block design in three replications by recommendation doses carried out in field conditions. The results show that there were significant differences between treatments (Deltamethrin, Cypermethrin, Chlorpyrifos and control) after 24, 48 and 72 hours. After 24 and 48 hours Cypermethrin showed more lethality in comparison other treatments, and after 72 hours the Chlorpyrifos showed lethality.
Pages : 235-238 | 1232 Views | 40 Downloads
How to cite this article:
Sevda Dadrass, Shahram Mirfakhraie, Shahram Aramideh, Mohammad Hassan Safaralizadeh. The lethal effects of three insecticides Deltamethrin, Cypermethrin and Chlorpyrifos against adult stage of alfalfa weevil, Hypera postica Gyllenhal (Col.: Curculionidae). J Entomol Zool Stud 2016;4(5):235-238.
Journal of Entomology and Zoology Studies
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