Effects of UV-B radiation combined with reflective plastic mulch on Tetranychus Urticae in strawberry production
2018
Suzuki, K. | Sekine, T. | Ohba, A. | Takayama, S.
Ultraviolet-B (UV-B) radiation is used as a countermeasure against powdery mildew on strawberries. In this study, the effects of UV-B radiation exposure as a measure for controlling Tetranychus urticae were tested. After conducting tests using the leaf disk method in strawberry production, it was observed that the UV-B radiation caused adult females to lay fewer eggs than normal and prevented some of the eggs from hatching, thus confirming the effects of UV-B radiation exposure in controlling T. urticae. Upon conducting tests that combined the use of Phytoseiulus persimilis and UV-B radiation in soil cultivation, we concluded that reflective plastic mulch, which can reflect UV-B radiation to the undersides of leaves, effectively suppressed the number of T. urticae. The P. persimilis further suppressed the number of T. urticae by feeding on them. Another UV-B radiation test utilizing Amblyseis californicus found in elevated cultivation showed that the combination of A. californicus, which feeds on T. urticae, and reflective plastic mulch was also effective in suppressing the number of T. urticae.
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