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首页> 外文期刊>Archives of Phytopathology and Plant Protection >Field assessment of insecticidal efficacy of some plant aqueous extracts in reducing cowpea pod-sucking bug Acanthomia tomentosicollis Stal (Hemiptera: Coreidae) infestation and damage
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Field assessment of insecticidal efficacy of some plant aqueous extracts in reducing cowpea pod-sucking bug Acanthomia tomentosicollis Stal (Hemiptera: Coreidae) infestation and damage

机译：现场评估某些植物水提物对减少cow豆荚虫臭虫（半翅目：金龟科）侵染和破坏的杀虫功效

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摘要

Array of pest complex and yield reduction due to insect pests is one of the major constraints for low productivity of cowpea. The insecticidal efficacy of Spondias mombia, Momordica charantia, Mitrocarpus villosus and Chenopodium ambrosioides crude aqueous extracts was assayed for suitability in controlling the pod-sucking bug Clavigralla tomentosicollis Stal (Hemiptera: Coreidae) on cowpea. The field experiment was laid out in a randomised complete block design with two treatments replicated three times at the Teaching and Research Farm of Rufus Giwa Polytechnic, Owo, Ondo State, in 2012. One kilogram of plant leaves was pounded using mortar and pestle and soaked in 3 L of cold water overnight. The extracts were applied at 10% (v/w) and sprayed every week for four weeks and a synthetic insecticide (Lambda cyhalothrin) was used as reference to compare the effectiveness of the plant extracts. Results of the experiment show that the plant extracts caused considerable reduction in the insect population; similarly, yield attributes corresponded positively with the effectiveness of the treatment and were at par with the synthetic insecticide. However, among the plots treated with aqueous plant extracts, the plot treated with 5. mombia performed betterthan other plant extracts in terms of number of unin-fested pods (55.34), plots treated with C. ambrosioides, having least number of damaged (infested) pods (6.0), and plots sprayed with S. mombia, having highest number of harvested pods (62.67), uninfested pods (55.34) and seed weight (0.18 kg). This study is probably the first reported case of the potential of the evaluated plant extracts for the control of insect pests of field crops. Therefore, the present study suggests the use of all the tested plant extracts, as they have been found to be very promising biopesticides in the control of cowpea pod-sucking insect pests. Thus, the extracts could be a good alternative to the synthetic insecticides on organically managed farms as well as on farms of limited-resource farmers in the tropics and sub-tropics.
机译：多种害虫复合物和因害虫引起的减产是of豆低产的主要限制之一。测定了Spondias mombia，Morordica charantia，Mitrocarpus villosus和Chenopodium ambrosioides粗水提液的杀虫功效，以控制controlling豆上的豆荚吸虫Clavigralla tomentosicollis Stal（Hemiptera：Coreidae）。现场实验采用随机完整区组设计进行，2012年在恩多州奥沃的Rufus Giwa Polytechnic的教学与研究农场重复了两次处理，两次处理。用研钵和研杵捣烂一公斤植物叶子，然后浸泡在3升冷水中过夜。将提取物以10％（v / w）的比例施用，每周喷洒四周，并使用合成杀虫剂（Lambda cyhalothrin）作为参考来比较植物提取物的功效。实验结果表明，植物提取物引起昆虫种群的大量减少。同样，产量属性与治疗效果呈正相关，与合成杀虫剂相当。但是，在用含水植物提取物处理的地块中，经5. mobbia处理的地块在未受虫侵染的豆荚数量（55.34）方面表现优于其他植物提取物，而经C. ambrosioides处理的地块，受破坏（受侵染）的数量最少）豆荚（6.0），以及喷洒链球菌的地块，收获的豆荚数量最高（62.67），未出没的豆荚数量（55.34），种子重量（0.18 kg）。这项研究可能是第一个报道的被评估植物提取物用于防治大田作物害虫的潜力的案例。因此，本研究建议使用所有经过测试的植物提取物，因为它们已被发现是控制promising豆荚果吸食害虫的非常有前途的生物农药。因此，在有机管理的农场以及热带和亚热带的资源有限的农民的农场上，提取物可能是合成杀虫剂的良好替代品。

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