Research Article 
Behavioral and Insecticidal Effects of Three Plant Oils on Bemisia tabaci
Journal of Entomology, 2017, 14(2), 87-95.
Abstract
Background and Objective: The sweet potato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) is one of the most important economic pests, causes great losses in many economic crops. The present study aimed to control B. tabaci through suitable successful Integrated Pest Management programs (IPMs) safe enough to man and environment, by inserting some plant oils as alternatives or synergists for pesticides. Methodology: The effects of three plant oils cumin (Cuminum cyminum), thyme (Thymus vulgaris) and garlic (Allium sativum) as repellents or oviposition deterrents against whitefly, Bemisia tabaci were tested. The insecticidal effect of these oils and their mixtures with a recommended insecticide (Cetam) against B. tabaci was investigated for inserting them within IPM programs. Additionally, the deterrence effects were analyzed using SAS9.2 procedures at probability level of 0.05 and the toxicity was analyzed using probit analysis. Results: All three tested oils effectively prevented B. tabaci adults either from feeding or laying eggs. The highest repellency and anti-oviposition effects occurred with thyme oil treatment, followed by garlic oil. The greatest effect on immature stages was found with thyme oil, which reduced the survival rate of egg and pupae of B. tabaci after egg treatment, while the greatest effect on survival of larvae was observed with garlic oil. Bemisia tabaci larvae were more sensitive to plant oil treatments, compared with eggs and pupae. The adult mortality was increased in conjunction with increasing dose of tested oils. All mixtures of cetam with plant oils and mixtures of oils together resulted in additive or potentiating effect. Conclusion: It is concluded that the tested oils may use as insecticide alternatives in an integrated pest management program for the subject pest.
ASCI-ID: 48-464
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