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首页> 外文期刊>Journal of entomology >Potency of Chenopodium ambrosioides Powders and its Combinations with Wood Ash on Sitophilus zeamais in Stored Maize
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Potency of Chenopodium ambrosioides Powders and its Combinations with Wood Ash on Sitophilus zeamais in Stored Maize

机译：玉米白粉病菌粉及其与木灰的组合对玉米贮藏玉米中Sitophilus zeamais的效力

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摘要

In an effort to develop easily available, affordable and biodegradable reduced-risk insecticides as alternatives to conventional synthetic post-harvest protectants against storage weevils, powders of Chenopodium ambrosioides were tested singly and incombination with the often used wood ash under ambient laboratory conditions on Sitophilus zeamais infested maize. This is a major impediment to sustained food security in Africa and other developing countries. The powders were mixed at varied doses of C. ambrosioides (0.5-2 g) powder per 50 g of maize grains; there was also a positive control of Actellic~R powder and an untreated negative control. Grains treated with 2 g of C. ambrosioides powder caused 100% adult weevil mortality within 3 days after infestation. At 2 g, C. ambrosioides powders were as good as Actellic~R powder on adult weevil mortality, protection of grains against damage and reduction of number of weevil progeny produced within 1-2 months of storage. The grain weight loss decreasedwith increased concentration of plant powder used but increased with longer duration of storage. The persistency effects of C. ambrosioides powder decreased over time till the powder lost its potency on adults beyond three weeks of grain storage. A proportional combination of 50:50% of C. ambrosioides powder and wood ash killed S. zeamais adults at a faster rate than either powder singly. The results indicate that the use of mixtures of C. ambrosioides powder and wood ash by small scale farmers is potentially a cost-effective and sustainable alternative or supplement to synthetic chemical insecticides for large-scale maize storage.
机译：为了开发易于获得，可负担且可生物降解的降低风险的杀虫剂，以替代传统的人工合成贮藏后收获物保护剂，对am藜的粉尘进行了单独测试，并在常温实验室条件下与常使用的木灰混合，在Sitophilus zeamais上进行了测试。出没的玉米。这是非洲和其他发展中国家持续粮食安全的主要障碍。每50克玉米粒以不同剂量的杀粉梭菌粉末（0.5-2克）混合。还有Actellic〜R粉末的阳性对照和未处理的阴性对照。用2 g杀虫梭状芽孢杆菌粉末处理的谷物在感染后3天内导致100％的成年象鼻虫死亡。在2 g的条件下，杀虫梭状粉体在成年象鼻虫死亡率，保护谷物免受损害以及减少在1-2个月内产生的象鼻虫子代数量方面与Actellic〜R粉末一样好。谷物失重随所用植物粉浓度的增加而降低，但随储存时间的延长而增加。纤细梭状芽胞杆菌粉的持久性效果会随着时间的流逝而降低，直到超过三周的谷物储藏期才对成人失去效力。比例为50：50％的Ambrosioides粉末和木灰杀死玉米赤霉菌成虫的速度要比任何一种粉末都要快。结果表明，小规模农民使用杀虫梭状芽胞杆菌粉和木灰的混合物可能是经济有效的可持续替代玉米补充剂，或替代合成化学杀虫剂来大规模储存玉米。

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