Integrated control of two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) on strawberry
1999
Wiman Sriphen | Vatana Charanasri | Ausanee Chattrakul | Manita Kongchuensin(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Div. Mite and Spider Research Group)
Integrated control of two-spotted spider mite, Tetranychus urticae Koch, by releasing the predatory mite, Amblyseius longispinosus (Evans), together with the application of various pesticides was conducted in the strawberry plots at the Inthanon Royal Project Development Center. The control result was compared with that of the farmer plot in Chiang Mai. The experiment in 1997 indicated that the releasing of predatory mites when the population of T. urticae reached the economic threshold level of 5-20 mites/leaflet along with the successive applications of acaricides and pesticide sprays for the control of thrips provided less strawberry yields and the return of 44,782 Baht/400 square m as compared to that of the farmer plot which provided the return of 47,658 Baht/400 square m. The experiment in 1998 was then adjusted by releasing the predatory mites as early as the number of T. urticae was found at 1-2 mites/leaflet. There were no applications of acaricides and furrow irrigation was applied. Four-time inundative releases of predatory mites every two-consecutive week provided effective control of the two-spotted spider mite and the average yields of B-grade strawberry (4 fruits/bunch) at 1.118 bunches/plant and the return of 22,933 Baht/400 square m while in the farmer plot the average yields of C-grade strawberry (4 fruits/bunch) was 0.955 bunch/plant with the return of 13,683 Baht/400 square m. The R/C ratio of the IPM plot was 1.17 times higher than that of the farmer's plot.
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This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University
