Control Effects of Three Insecticide Sprays and Root Irrigation on Population of Tomato Bemisia tabaci

Abstract

【Objective】The study aimed to explore the effects and application methods of dinotefuran, cyantraniliprole and spirotetramat in the control of Bemisia tabaci in Guangxi region, with a view to providing references for the control of B. tabaci in Guangxi.【Method】The control effects of dinotefuran, cyantraniliprole and spirotetramat on B. tabaci population on tomatoes in open field and greenhouse were compared by spraying and root irrigation.【Result】In open field tomato experiment, after treatment for 3 to 21 days, there was no significant difference in adult and nymph population density of B. tabaci among different treatments, which was lower than 0.53 whiteflies per leaf. After being treated with cyantraniliprole spray for 42 days, the adult population density of B. tabaci was 0.63 whiteflies per leaf, which was significantly lower than of that of the treatment without spraying any insecticide(CK)(1.41whiteflies per leaf). There were significant differences in the population density of B. tabaci nymphs among different treatments after treatment for 28 to 42 days. The population density of B. tabaci nymphs treated with dinotefuran, cyantraniliprole and spirotetramat or root irrigation with 3 times the amount of cyantraniliprole was lower than 0.31 whiteflies per leaf after treatment for 28 to 42 days. In the greenhouse, the cyantraniliprole or spirotetramat had a good control effect on the adults and nymphs of B. tabaci, especially in the 28 d and 42 d after spraying, the population density of adults and nymphs was significantly lower than that of CK. The nymph densities of were 0.33 whiteflies per leaf and 0 whitefly per leaf after being treated cyantraniliprole and spirotetramat for 28 days, while the density of nymphs in CK was 2.85 whiteflies leaf.【Conclusion】Cyantraniliprole had a good and stable control effect on the population of B. tabaci.The spray treatment with dinotefuran showed a good effect on B. tabaci on tomatoes in open field, while the spray treatment with spirotetramat in greenhouse showed a good long-term effect on the control of B. tabaci. At the same dose, the control effect of cyantraniliprole and spirotetramat on B. tabaci population by spraying was generally better than that by root irrigation. The control effect of cyantraniliprole on B. tabaci population could be improved by increasing the amount of root irrigation.

Keywords

• insecticide
• bemisia tabaci
• tomato
• prevention and control
• application method