Dinotefuran-sprayed grape clusters: Control effect on Japanese mealybugs, deposit of the pesticide, and causes for low pesticide recovery rate in unripe berries
2015
Nagasaki, Y. | Sawamura, N. | Himemiya, M.
After spot spraying a pesticide (dinotefuran) on clusters of grapes, the control effect on Japanese mealybugs, deposits of the pesticide, and causes for low recovery rate of the pesticide on unripe berries were investigated. The followings were noted: 1. At sites sprayed with dinotefuran, the number of clusters with mealybugs, the number of entire mealybugs, and the number of scars on berries were much less than those at sites not sprayed with dinotefuran. Thus, this pesticide application method is considered to successfully control Japanese mealybugs. 2. Concentrations of dinotefuran on 'Delaware' berries and stems were higher than those on 'Pione' berries. 3. One cause for a low pesticide recovery rate on the unripe berries is considered the high concentration of organic acids. 4. The recovery rate of dinotefuran improved with the addition of 0.5M phosphate acid buffer solution (pH7.0) on unripe berries.
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