Athanassiou Christos G, Kontodimas Demetrius C, Kavallieratos Nickolas G, Veroniki Maria Anagnou
Laboratory of Agricultural Zoology and Entomology, Agricultural University of Athens, 75 Iera Odos, 11855, Athens, Attica, Greece.
J Econ Entomol. 2005 Oct;98(5):1733-8. doi: 10.1093/jee/98.5.1733.
The insecticidal effect of the azadirachtin-based insecticide, NeemAzal, was examined against adults of Rhyzopertha dominica (F.), Sitophilus oryzae (L.), and Tribolium confusum Jacquelin du Val in rye, whole oats, and peeled oats. The insecticide was applied at three dose rates, which were equivalent to 50, 100, and 200 ppm of azadirachtin A. Adults of the above-mentioned species were exposed to the treated grains at 25 degrees C and 65% RH, and mortality was assessed after 24 h, 48 h, 7 d, and 14 d of exposure. Then, all adults were removed, and the treated substrate remained at the same conditions for an additional 45 d. After this interval, the grains were checked for progeny production. In all species and commodities tested, mortality increased with the increase of dose and exposure interval, except for T. confusum on whole and peeled oats. For R. dominica, NeemAzal was more effective on oats than on rye and peeled oats. In contrast, at rates > or = 100 ppm, azadirachtin was equally effective against S. oryzae on whole rye and oats, where mortality was 100% after 7 and 14 d of exposure, respectively. NeemAzal was not very effective against T. confusum where adult mortality was low, even after 14 d of exposure at the highest rate. For all species, significantly less progeny were recorded in the treated grains than in the untreated grains, with the exception of T. confusum on oats where offspring was significantly reduced only at the highest rate.
研究了印楝素类杀虫剂NeemAzal对谷蠹、米象和杂拟谷盗成虫在黑麦、整燕麦和去皮燕麦中的杀虫效果。该杀虫剂以三种剂量施用，分别相当于50、100和200 ppm的印楝素A。将上述物种的成虫置于25摄氏度和65%相对湿度条件下接触经处理的谷物，在接触24小时、48小时、7天和14天后评估死亡率。然后，将所有成虫移除，经处理的基质在相同条件下再放置45天。在此间隔后，检查谷物的子代产生情况。在所有测试的物种和商品中，除了整燕麦和去皮燕麦上的杂拟谷盗外，死亡率均随剂量和接触间隔的增加而增加。对于谷蠹，NeemAzal对燕麦的效果比对黑麦和去皮燕麦更好。相比之下，当剂量≥100 ppm时，印楝素对整黑麦和燕麦上的米象效果相同，在接触7天和14天后死亡率分别为100%。NeemAzal对杂拟谷盗的效果不佳，即使在最高剂量下接触14天，成虫死亡率也很低。对于所有物种，经处理的谷物中记录到的子代显著少于未处理的谷物，但燕麦上的杂拟谷盗除外，其后代仅在最高剂量下显著减少。
