Effects of Violet Light Radiation on Growth, Development and Reproduction of Scopula subpunctaria (Herrich-Schaeffer) at Different Instars
Effects of Violet Light Radiation on Growth, Development and Reproduction of Scopula subpunctaria (Herrich-Schaeffer) at Different Instars
Li Qiao*, Shubao Geng, Shibao Guo, Hongmin Liu, Jian Yin and Quan Zhang
ABSTRACT
Scopula subpunctaria (Herrich-Schaeffer) is one of the important pests in tea garden. To explore the effects of violet light on its growth, development and reproduction, the 2nd and 5th instar larvae were irradiated under light at the wavelengths of 400 and 420 nm with 6 different irradiation times (0, 60, 90, 120, 150 and 180 min). The development duration, pupation rate, abnormal pupation rate, pupal weight, adult emergence rate, male and female adult longevity, oviposition rate of S. subpunctaria were measured. The results showed that with the increase of treatment time, the duration of 2nd instar larvae shortened, and the difference between the two wavelength treatments was significant; while the mortality increased, the pupation rate decreased, and the pupa weight and adult emergence rate decreased. The development duration of 5 instar larvae was significantly shortened, and the pupation rate and abnormal pupation rate were significantly increased. The pupa weight of 5th instar larvae was significantly higher than that of 2nd instar larvae. Except the mortality of 2nd instar larvae increased significantly, there was no difference in adult emergence rate and average single female oviposition between the two treatments. Under violet light treatments, the longevity of male adults of S. subpunctaria was longer than that of female adults, with no significant difference. This paper is expected to provide a reference for in-depth study and application of light in the prevention and control of tea garden.
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