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首页> 外文期刊>African Entomology >Comparison of three entomopathogenic fungi against the boilworm, Helicoverpa armigera (Hiibner) (Lepidoptera: Noctuidae), employing topical vs per os inoculation techniques
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Comparison of three entomopathogenic fungi against the boilworm, Helicoverpa armigera (Hiibner) (Lepidoptera: Noctuidae), employing topical vs per os inoculation techniques

机译：使用局部和口服接种技术比较三种针对虫子的虫病真菌（棉铃虫（Hiibner）（鳞翅目：夜蛾科））

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摘要

The increasing pest status of the bollworm, Helicoverpa armigera (Hubner) in South Africa, has prompted renewed interest in the use of bio-insecticides, especially as resistance is suspected to be developing against commonly used pyrethroids. Three entomopathogenic fungi, Beauveria bassiana (Balsamo-Crivelli) Vuillemin, Nomuraea rileyi (Farlow) Samson and Isaria fumosorosea Wize were compared in laboratory bioassays employing topical versus per os inoculation techniques. At a dose of 3.75 x 105 conidia per larva, N. rileyi out-performed both I. fumosorosea and B. bassiana, causing a mean of 87 ± 1.4 % mortality. Following treatment of larvae the proportional mortality among larvae and pupae was generally biased towards pupae with (pooled) treatmentmean mortalities of 28 ± 8 % vs 56 ± 18 %, respectively. Notably, no difference was detected between the two inoculation techniques employed with any of the three fungal species assayed. The incubation periods for topical applications ranged from 4 days (PPRI 7201 and 8072) to 7 days (PPRI 7758) while per os treatments responded on Day 4 (PPRI 8072) and Day 5 (PPRI 7758 and 7201) post-inoculation. A general trend of accelerated pupation following treatment with N. rileyi was noted with both inoculation techniques. A novel per os inoculation substrate was tested that ensured more accurate dose acquisition and performance quantification. Compared to the other fungi, superior performance by N. rileyi underscores the potential of this species for development as a myco-insecticide against H. armigera.
机译：南非棉铃虫（Helicoverpa armigera，Hubner）的病虫害状况不断增加，引起了人们对使用生物杀虫剂的新兴趣，特别是因为怀疑对常用的拟除虫菊酯产生了抗药性。在采用局部接种和逐次接种技术的实验室生物测定中，比较了三种致病性真菌，球孢白僵菌（Balsver-Crivelli）Vuillemin，野村赤霉病（Farlow）Samson和Isaria fumosorosea Wize。每个幼虫的分生孢子剂量为3.75 x 105分生孢子，N。rileyi优于I. fumosorosea和B. bassiana，平均死亡率为87±1.4％。幼虫处理后，幼虫和p间的比例死亡率通常偏向p，（合并）处理死亡率分别为28±8％和56±18％。值得注意的是，在所检测的三种真菌物种中的任何一种所采用的两种接种技术之间均未发现差异。局部应用的潜伏期从4天（PPRI 7201和8072）到7天（PPRI 7758）不等，而口服治疗在接种后的第4天（PPRI 8072）和第5天（PPRI 7758和7201）有反应。两种接种技术均表明，在用莱里氏猪笼草治疗后加速化脓的总体趋势。测试了一种新型的经口接种基质，可确保更准确的剂量采集和性能定量。与其他真菌相比，N。rileyi的优异性能强调了该物种作为抗棉铃虫真菌杀虫剂的发展潜力。

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