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首页> 外文期刊>Indian Journal of Weed Science >Investigations on the release of exotic beetle for control of Parthenium hysterophorus in Delhi
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Investigations on the release of exotic beetle for control of Parthenium hysterophorus in Delhi

机译：在德里控制外来甲虫释放Parthenium hysterophorus的调查

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摘要

A Mexican beetle, Zygogramma bicolorata Pallistcr (Chrysomelidae : Coleoptera) was introduced in Delhi on September 15, 2001 in order to suppress the congress grass, Parthenium hysterophorus Linnaeus at a prevailing temperature of 20-38 deg C and 39-73 percent relative humidity. The beetles were also released at the research fields of the Indian Agricultural Research Institute, New Delhi, during September 2001 and were found multiplying at three out of five release sites till the end of October 2001 (14.4-36.4 deg C and 41-66 percent RH). The beetle remained unnoticed with decline in day temperature during the winter, though in the laboratory, at 26+-2 deg C and 60+-10 percent R.H., it continued breeding without over wintering. Adults approachingover wintering laid few eggs upto 3rd week of November (temperatures ranging from 9.4 to 35.4 deg C and relative humidity ranging from 61-93 percent), which failed to hatch afterwards. No egg laying was observed during foggy and chilling weather in December with a minimum and maximum temperature between 3.5 to 8.0 deg C and 17.2 to 22.2 deg C, respectively. Non-over wintering females showed profuse egg laying continuously during chilling weather upto three days when released on Parthenium plants grown in pots. Survival of scanty adults during chilling weather at Delhi thus suggests that even though Parthenium beetle is unlikely to reproduce, its establishment can't be ruled out. Among various substrata evaluated for pupation, vermicompost, loamy soil and sawdust were superior, facilitating 75-100 percent pupation and 82.11 to 97.55 percent emergence. A focus on the biology is also covered in the present paper.
机译：墨西哥甲虫Zygogramma bicolorata Pallistcr（金眼科：鞘翅目）于2001年9月15日在德里被引进，目的是在20-38摄氏度和39-73％的相对湿度的普遍温度下抑制国会草，Parthenium hysterophorus Linnaeus。甲虫还于2001年9月在新德里的印度农业研究所的研究领域内被释放，直到2001年10月底，在五个释放地点中有三个正在繁殖（14.4-36.4摄氏度和41-66％） RH）。尽管在实验室中在26 + -2摄氏度和60 + -10％R.H.的条件下，甲虫在冬季白天温度下降的情况下仍未引起注意，但它继续繁殖而没有过冬。接近越冬的成虫在11月的第3周（温度为9.4至35.4摄氏度，相对湿度为61-93％）下几乎没有产卵，此后未能孵化。在12月的大雾和寒冷天气中，未观察到产卵现象，最低和最高温度分别在3.5至8.0摄氏度和17.2至22.2摄氏度之间。未越冬的雌性在盆栽的Parthenium植物上放出后，在寒冷的天气中长达3天连续产卵。因此，在德里寒冷的天气中成年成年人的生存状况表明，即使Part天蛾甲虫不太可能繁殖，也不能排除其建立。在评估化up的各种基质中，ver粉，壤土和锯末占优势，促进化-100的比例为75-100％，出土率为82.11至97.55％。本文还讨论了生物学。

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