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臺南亞蔬農場田菁上豆莢螟（Maruca vitrata（Fabricius））（鱗翅目：螟蛾科）幼蟲之族群變動
Larval Population Changes in the Bean Pod Borer, Maruca vitrata (Lepidoptera: Pyralidae) on Sesbania cannabina on an AVRDC Farm, Tainan, Taiwan
摘要
在臺南亞蔬農場，1996及1997年之3月至10月間，每兩週播種田菁（Sesbania cannabina）一次。播種後15及30日，及以後每週各調查幼蟲密度一次。結果發現豆莢螟（Maruca virtata （Fabricius））可利用田菁植物完成生活史，平均化蛹率47.7～90.4％，羽化率66.6～100％。幼蟲出現於5至12月間，尤以6至9月為高峰期。1997年8月及9月之幼蟲數最高，達868及756隻／50株。10月以後，田菁植株矮化，生長勢較差，且有提早開花結莢之現象，致使豆莢螟族群密度降低。綜合幼蟲密度高峰發生情形，豆莢螟一年至少發生9代，兩代間隔20～42日。幼蟲多發生在田菁播種後50～90日，主要為害花器及嫩葉，此時生草含氮量最高。
並列摘要
Sesbania cannabina (Retz.) was sown once every 2 weeks on an Asian Vegetable Research and Development Center (AVRDC) farm, in Tainan from March to October in 1996 and 1997. Larval populations of the bean pod borer, Maruca vitrata (Fabricius), were surveyed on days 15 and 30 after sowing, and once a week thereafter. The results showed that Marica vitrata was able to complete its life cycle on S. cannabina with pupation and adult emergence rates of 47.7~90.4% and 66.6~100%, respectively. The larvae occurred from May to December with population peaks from June to September. The highest population densities were found to be 868 and 755 larvae/50 plants in August and September 1997, respectively. After October the population densities became lower and dropped to zero in January due to the poor quality of S. cannabina. Based on the population peaks, there were at least nine generations in a year. The intervals between generations were 20~42 days. Larvae infested the flowers and leaflets of S. cannabina from 50 to 90 days after sowing, when these plants contained the highest nitrogen content.
被引用紀錄
延伸閱讀
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