黑肩绿盲蝽耐饥饿能力的研究

【目的】为早期释放黑肩绿盲蝽Cyrtorhinus lividipennis提供理论依据,研究了黑肩绿盲蝽不同虫态耐受饥饿及低温的能力。【方法】室内条件下,比较了稻苗+水、无苗有水和无苗无水三种食物条件下黑肩绿盲蝽耐饥力大小。【结果】适温(26℃)下,黑肩绿盲蝽3龄若虫、5龄若虫和成虫在稻苗+水的存活时间显著高于无苗有水,无苗有水时的存活时间又显著高于无苗无水,表明稻苗对于黑肩绿盲蝽有营养作用,取食稻苗有助于提高黑肩绿盲蝽的耐饥力。黑肩绿盲蝽成虫耐饥力最强,3龄若虫和5龄若虫接近,有苗有水时,3龄若虫、5龄若虫和成虫的平均存活时间分别为2.10、2.22和4.25 d。在低温(15℃)下,水稻苗对黑肩绿盲蝽成虫的存活不利,有苗有水时雌雄成虫的存活时间均低于无苗有水处理,其中雌成虫两处理间的差异显著(P=0.001)。【结论】黑肩绿盲蝽对饥饿和低温有较强的耐受性,以成虫最强,水稻生长前期田间释放时以成虫为宜。

Hunger tolerance of Cyrtorhinus lividipennis

Objectives] The tolerance of Cyrtorhinus lividipennis to different levels of starvation and low temperature were studied in order to provide a theoretical basis for early releasing of C. lividipennis into the rice ecosystem. Methodsl The survival of different life stages of C. lividipennis was measured under three treatments （including rice plant plus water, water only and no plant and water） under laboratory conditions. Results] The results showed that at 26℃, the mean survival time of 3rd instar nymphs, 5th instar nymphs and adults, was longer when provided with rice plants plus water than those provided with water only; insects that were not provided with either plants or water had the shortest survival time. It implied that rice plants can provide nutrition for C. lividipennis. C. lividipennis adults had the strongest starvation tolerance, whereas the starvation tolerance of yd instar nymphs was close to those of 5th instar nymphs. The mean survival time of 3rd instar nymphs, 5^th instar nymphs and adults provided with rice plants and water was 2.10, 2.22 and 4.25 days respectively. At a lower temperature of 15 ℃, rice plants negatively affected adult survival. The longevities of adults fed on rice plants were shorter than those provided with water only. Conclusion] C. lividipennis has a strong tolerance of starvation and low temperatures, particularly at the adult stage, so adults are the optimal choice for releasing into the rice ecosystem during the nutritive growth stage of flee.