《环境昆虫学报》

作者	单位
李鸿波，王维滔，陈亚雄，叶照春，朱峰，何永福	1.贵州省植物保护研究所，贵阳 550006；2.贵阳市清华中学，贵阳 550025

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中文摘要:

粘虫Mythimna separata（Walker）是一种典型的季节性远距离迁飞害虫，也是我国及其它亚洲和澳洲国家粮食作物上重大害虫。贵州省地处我国西南部，是二代粘虫的常年发生地，但有关粘虫在贵州的越冬问题未有详细报道。为探明粘虫是否可以在贵州越冬，本文对2日龄蛹过冷却点，耐低温能力进行了测定，并在田间进行了越冬笼罩实验和越冬调查试验。结果表明，粘虫的过冷却点为-14.95℃，结冰点为-9.52℃。低温和暴露时间对粘虫的存活率具有显著影响。在10℃下处理30 d后，其存活率高达96.5%，处理90 d后仅有5%个体存活。但在-5℃下处理0.5 h后的存活率为80.00%，而处理8 h就全部死亡。田间笼罩试验结果发现2日龄蛹的存活率随埋蛹时间延长而降低，但至100 d仍有46.67%个体存活；同时，越冬调查发现少量的蛹和老熟幼虫，包括1头老熟幼虫和29头蛹。这些结果表明，粘虫可以以老熟幼虫和蛹等虫态在贵州低海拔地区成功越冬。

英文摘要:

The oriental armyworm,Mythimna separata(Walker) is a typical, seasonal, long distance, migratory insect pest that causes significant damage to food crops in China and other parts of Asia and Oceania. Guizhou province, located in southwest of China, is a common place for M.separata occurrence. To explore whether this insect pest can overwinter in Guizhou, suppercooling point and cold tolerance of 2-day. M. separata pupae were evaluated in the laboratory, and the survival rate and distribution during winter were also examined in the field. Our results showed that the suppercooling point and freezing point were-14.95℃ and -9.52℃, respectively. The survival rate of 2-day. M. separata pupae were significantly affected by low temperature and exposure time. For example, survival rate after 30 d treatment was as high as 96.5% under 10℃; but it was only 5% when lasted to 90 d. Under -5℃, the survival rate was 80.00% after 0.5 h treatment, and it was completely died after 8 h treatment. Field cage experiment in winter indicated that the survival rate was obviously decreased with extended time, but it remained as high as 46.67% after treatment for 100 d. Meanwhile, overwinter survey indicated that a few old larvae and pupae were found in the field, including one old larvae and 29 pupae. The above data proved that M. Separata can overwinter as old larvae or pupae in low altitude areas of Guizhou Province.

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