Journal of Taiwan Agricultural Research

Author:Kun-Yaw Ho*, Shi-Cheng Hung and Chien-Chung Chen

Abstract:

    The result of Spinosad bait spray (diluted 8-fold, spot sprayed weekly, 4 spots per plant, ca. 5 ml per spot) tested in guava orchards at Touliu in 2004 showed that it could effectively control the Oriental fruit fly, Bactrocera dorsalis (Hendel). The percentage of fruit damaged and the degree of fruit infested decreased significantly after 3 weeks of consecutive applications. These two infested indices in the second fruiting season decreased from 100 and 95.2% before the treatment to 33.9 and l6.2% in average after 7 weeks of treatments, respectively. The averaged control rates were 60.9 and 65.9% after 7 weekly applications in the first and second fruiting seasons, respectively and which were higher than the treatments with the sprays of Nulure protein hydrolysate bait (37.1 and 48.0%). Furthermore, the control rate was significantly higher when it was calculated from the degree of fruit infested than from the percentage of fruit damaged. The effectiveness of Spinosad bait spray in the control of fruit fly could be influenced by the plot size, distance between plots, adjacent environment, and the weather. Therefore, area-wide control is recommended to ensure the best controlling result. In addition, re-application of the bait will be necessary after rain. The baits used in this experiment were not effective if applied with the net-bag hanging method in the field.

Key words:Spinosad bait, Guava, Attractant, Bactrocera dorsalis

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