二氧化硫对墨西哥豆瓢虫的影响

空气污染对害虫的影响,国内尚无研究报道。本文报道了作者在美国农业研究中心植物胁迫实验室进行的部分工作。实验结果表明,在0.30ppmSO_2的作用下,墨西哥豆瓢虫(Epilachna varivestis)的取食量和蛹重增加;与未受污染的寄主植物相比,豆瓢虫偏食受污染的植物;而且有嗜食含较高糖分寄主植物的倾向;在污染空气中长成的成虫可消耗更多的植物物质。

EFFECTS OF SO2 ON MEXICAN BEAN BEETLE

In order to exame the responses of Mexican Bean Beetle (Epila-chna varivestis) to SO2-polluted plants, the following studies were conducted: (1) direct and indirect fumigation (SO2 0.3ppm) ; ( 2 ) feeding preferences and (0) changes of feeding habits. The results showed that the pupal weights of Mexican Bean Beetles were havier when the larvae fed on SO2-fumigated leaves than when they fed on unfumigated leaves (p<0.05) . It was still true as compared with female pupae or male pupae alone between different treatments in direct effects. But in indirect one, there were no significant differences of pupal weights of the insects feeding on fumigated leaves than those feeding on unfumigated leaves. However, accorfing to feeding preference, the adults of Mexican Bean Beetl econsumed more leaf areas of fumigated leaves than those of unfumigated leaves (p<0.01, especially the adults grown up in SO2-fumigated air (p<0.01) . Furthermore, the adults from both sources had a preference of the host plants containing more sugar.