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首页> 外文学位 >Effect of neem oil on maize weevil, Sitophilus zeamais Motschulsky, and its parasitoid, Anisopteromalus calandrae (Howard).
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Effect of neem oil on maize weevil, Sitophilus zeamais Motschulsky, and its parasitoid, Anisopteromalus calandrae (Howard).

机译：印ne油对玉米象鼻虫Sitophilus zeamais Motschulsky及其寄生蜂Anisopteromalus calandrae（Howard）的影响。

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The effect of neem oil, a product from the neem tree, Azadirachta indica A. Juss, on the biology of the maize weevil, Sitophilus zeamais Motsch., was investigated. Corn kernels treated with 100, 1,000, and 10,000 ppm of neem oil in acetone did not affect the survival of adult weevils. However, their oviposition rate was greatly reduced when they were held with corn kernels treated with 1,000 and 10,000 ppm of neem oil. The detrimental effect of the 1,000 ppm neem oil treatment was lost by 30 days after treatment, but the 10,000 ppm retained its effect for 60 days. The threshold concentration of neem oil affecting oviposition was 500 ppm. Weevils held for 7 days on corn kernels treated with 1,000 and 10,000 ppm laid fewer eggs than controls, but when the period of exposure was increased to 15 and 21 days, weevils oviposited normally. When given a choice, fewer weevils were found in treated than in untreated kernels. In all tests, the emergence of the F1 progeny was not affected by any concentration of neem oil. Similarly, 100 ppm neem oil and 10,000 ppm mineral oil affected neither weevil distribution nor oviposition.; Doses of 1,000 and 10,000 ppm of neem oil repelled weevils from corn kernels 24 h before the test; however, repellency disappeared after 15 days in the 1,000 ppm, but not the 10,000 ppm treatments.; Neem oil, at all doses tested (100-10,000 ppm), did not show any detectable effect on the biology of Anisopteromalus calandrae (Howard), a parasitoid of the maize weevil. However, at 10,000 ppm, neem oil showed a significant effect on the reproductive potential of the parasitoid, as measured by adult emergence and normal reproduction of the F1 progeny.; Neem oil has a potential for protecting stored grains from the attack of some major stored grain insect pests. In developing countries, where synthetic insecticides are expensive, the application of neem oil would offer a cheaper and suitable control strategy, specially in small scale storages.
机译：研究了印度the树的印em油（印za树Azadirachta indica A. Juss）对玉米象鼻虫Sitophilus zeamais Motsch。生物学的影响。在丙酮中分别用100、1,000和10,000 ppm印treated油处理的玉米粒不会影响成年象鼻虫的存活。但是，当将它们用1,000和10,000 ppm印em油处理的玉米粒固定时，它们的排卵率大大降低。 1,000 ppm印lost油处理后的有害作用在处理后30天消失，但10,000 ppm的印oil油处理持续60天。影响产卵的印em油的阈值浓度为500 ppm。在用1,000和10,000 ppm处理的玉米粒上保持7天的象鼻虫产卵的数量少于对照，但是当暴露时间增加到15天和21天时，象鼻虫的产卵率正常。如果有选择，处理后的谷粒中发现的象鼻虫少于未处理的谷粒。在所有测试中，F1后代的出现均不受印em油浓度的影响。同样，100 ppm印度em油和10,000 ppm矿物油既不影响象鼻虫的分布也不影响产卵。试验前24小时，玉米籽粒中1,000和10,000 ppm印度ne油驱除的象鼻虫的剂量；但是，在1,000 ppm处理中，驱避性在15天后消失了，但是在10,000 ppm处理中却没有消失。在所有测试剂量（100-10,000 ppm）下的印em油，对玉米象鼻虫的拟寄生物Anisopteromalus calandrae（Howard）的生物学均未显示任何可检测的作用。然而，印度adult油在10,000 ppm时，对成虫的繁殖潜力显示出显着影响，这是通过成年出苗和F1后代的正常繁殖来衡量的。印em油具有保护储粮免受某些主要储粮害虫侵袭的潜力。在合成杀虫剂价格昂贵的发展中国家，印em油的应用将提供更便宜，更合适的控制策略，特别是在小规模存储中。

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