Abstract
The striped stem borer, Chilo suppressalis (Walker), is one of the most economically important rice pests worldwide. However, biological control of this pest using natural enemies has rarely been documented. Indigenous natural populations of four Trichogramma species (i.e., T. japonicum, T. chilonis, T. dendrolimi, and T. ostriniae) were collected from the eggs of C. suppressalis in paddy fields. With the objective of screening suitable candidate species for controlling the striped stem borer, parasitism by these four Trichogramma species of the eggs of their native host, C. suppressalis, was evaluated at five temperatures (18, 22, 26, 30, and 34 °C) and four relative humidity (RH) regimes (30, 50, 70, and 90 %). The temperature and the humidity significantly affected the ability of all of the Trichogramma species to parasitize the eggs of their host. T. chilonis parasitized more eggs at 26 °C than at the other temperatures. By contrast, T. dendrolimi, T. ostriniae, and T. japonicum performed best within a wider temperature range. The host number parasitized was highest at 70 % RH and differed significantly among the Trichogramma species at all of the temperatures and humidities tested, except at 30 °C and 50 % RH. Generally, T. dendrolimi and T. japonicum performed better than the other species at 18–26 and 30–34 °C, respectively, whereas T. ostriniae parasitized the fewest host eggs at 30–70 % RH. Both T. dendrolimi and T. japonicum appear to be promising candidates for augmentative release against C. suppressalis in northeastern China.
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Acknowledgments
We appreciate the assistance of Professor Shou-Shan Huang for identification of Trichogramma species. This research was funded by Grants from the Department of Labour and Social Security of Jilin Province, China, and the Department of Science and Technology, Jilin Province, China (20090560 and 20090208).
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Yuan, XH., Song, LW., Zhang, JJ. et al. Performance of four Chinese Trichogramma species as biocontrol agents of the rice striped stem borer, Chilo suppressalis, under various temperature and humidity regimes. J Pest Sci 85, 497–504 (2012). https://doi.org/10.1007/s10340-012-0456-8
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DOI: https://doi.org/10.1007/s10340-012-0456-8