摘要
采用测定过冷却点的方法比较了南京地区同一越冬时期二化螟、三化螟和大螟的耐寒能力及其不同越冬期耐寒能力的变化。结果显示 :越冬中期老熟螟虫的过冷却能力以三化螟最高、二化螟次之、大螟最低 ,越冬后期三化螟过冷却能力仍高于二化螟 ;三化螟和二化螟体内含水量显著低于大螟 ,说明其过冷却能力的差异与体内含水量有一定关系 ;大螟的过冷却点随温度降低和龄期的增加而升高 ,表明其以耐冻对策越冬 ,而三化螟和二化螟过冷却点则随温度的降低而降低 。
Cold hardiness in three species of rice stem borers, namely, yellow stem borer (Scirpophaga incertulas ), striped stem borer (Chilo suppressalis ) and pink stem borer (Sesamia inferens ) in the same overwintering period in Nanjing area and that in the same species of rice stem borer in different overwintering periods were compared by measuring their supercooling point. The results showed that among rice stem borers in the middle stage of overwintering, Scirpophaga incertulas had the highest supercooling ability, Chilo suppressalis , the middle, and Sesamia inferens , the lowest. Scirpophaga incertulas also had higher supercooling ability than Chilo suppressalis in the late stage of overwintering. Body water content in Scirpophaga incertulas and Chilo suppressalis were lower than that in Sesamia inferens , which indicated that their supercooling ability related to body water content. The supercooling point of overwintering Sesamia inferens increased with the decrease of temperature and increase of larvae instar , and these indicated it was freeze tolerant. But the supercooling point of Scirpophaga incertulas and Chilo suppressalis decreased as the temperature decreased, which showed they were freeze intolerant.
出处
《江苏农业学报》
CSCD
2002年第2期85-88,共4页
Jiangsu Journal of Agricultural Sciences
基金
"十五"国家攻关重大专项 (2 0 0 1BA5 0 7A11)
江苏省"十五"攻关项目 (BE2 0 0 13 41)
