International Journal of Agricultural Policy and Research
Vol.2 (2),pp.061-068 2014
Article 13/ID/JPR019, 0 8pages
Copyright © 2014 Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 3.0 International License
Original Research Paper
Efficacy of different neem-based biopesticides against green peach aphid, Myzus persicae (Hemiptera: Aphididae)
Accepted 25 January, 2014
1*Shannag, H. S., 2Capinera, J. L. and 1Freihat, N. M.
1Jordan University of Science and Technology, Faculty of Agriculture, Department of Plant Production, P. O. Box (3030), Irbid 22110, Jordan.
2University of Florida, Institute of Food and Agricultural Sciences, Department of Entomology and Nematology, P. O. Box (110620), Bldg. 970, Natural Area Drive, Gainesville, Florida 32611, USA.
*Corresponding Author Email: hail(at)just.edu.jo
The effects of three commercial neem-based formulations, namely Azatrol (1.2% Azadiractin A and B), Triple Action Neem Oil (70% neem oil) and Pure Neem Oil (100% neem oil), were evaluated on the green peach aphid, Myzus persicae, under both laboratory and greenhouse conditions. A leaf disc choice test bioassay demonstrated that none of the formulated neem-based insecticides tested were repellent to green peach aphid at recommended concentrations, but a two-fold increase in the concentration of Azatrol and Triple Action Neem Oil elicited a 50% reduction in the number of aphids settling on treated leaf tissue in comparison with untreated leaf tissue. When aphids were fed foliage containing neem-based insecticides, the rates of honeydew excretion were significantly reduced, to 14-40% of the control, thus demonstrating feeding deterrence. Azatrol also functioned well systemically when applied via the roots, resulting in 50% decrease in the feeding activity of treated aphids compared to that of the controls. Greenhouse evaluation of these products at the recommended concentrations revealed that aphid colonization was reduced to 50-75% of the control one week after neem-based products were applied as a foliar spray, while almost total elimination of aphids was observed by Pure Neem Oil and Azatrol treatments when a second application of these chemicals was applied to the foliage at seven days following the first spray. Results indicate that the neem-based formulations tested were highly effective in suppressing aphid population, but did not act as an efficient repellent at standard application rates, and while suppressing feeding, were not able to completely inhibit food intake.
Key words: Green peach aphid, Myzus persicae, biopesticide, neem.