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Entomopathogenic efficacy of the endophytic fungi: Clonostachys sp. and Beauveria bassiana on Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) larvae under laboratory and greenhouse conditions
Egyptian Journal of Biological Pest Control ( IF 2.4 ) Pub Date : 2021-02-25 , DOI: 10.1186/s41938-021-00392-8
Fadhela Mohamed Mahmoud , Rachida Bendebbah , Bouchra Benssaci , Fethia Toudji , Lamia Tafifet , Zoulikha Krimi

Endophytic fungi are excellent sources of new natural bioactive products with potential for exploitation in medical, agricultural, and industrial fields. Beneficial effects of endophytes are not only limited to promoting plant growth, but also to react as plant protection agents against phytopathogenic microorganisms and plant pests. The tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is one of the main tomato pests in South America and in the Mediterranean basin. In the present work, the effectiveness of two endophytic fungi Clonostachys spp. and Beauveria bassiana were tested against T. absoluta larvae. Evaluation of the larvicidal effect in the laboratory by spraying 3 concentrations (D1 = 4 × 107 spores/ml, D2 = 4 × 106 spores/ml and D3 = 4 × 105 spores/ml) of fungal suspensions showed remarkable efficacy, which varied depending on the tested strain, concentration of application and time of exposure. Statistical analysis showed highly significant results on larval mortality rates for both endophytic than the control. After 15 days, dead larvae were mummified. Applications of tested isolates in greenhouse experiments confirmed their marked biological control efficacy than the synthetic insecticide (Emamectin benzoat). Number of mined leaves decreased depending on the contact time of the larvae with the fungal spores. Results suggest that the two endophytic fungi B. bassiana and Clonostachys spp. were very effective entomopathogenic fungi against T. absoluta. Indeed, the present study revealed the pathogenicity of Clonostachys spp. against T. absoluta larvae for the first time.

中文翻译:

内生真菌的昆虫病原功效:Clonostachys sp.。在实验室和温室条件下,在图塔绝对种(Meyrick)(鳞翅目:Gelechiidae)的幼虫上和球孢白僵菌

内生真菌是新的天然生物活性产品的极佳来源,具有在医学,农业和工业领域中开发的潜力。内生菌的有益作用不仅限于促进植物生长,而且还可以作为植物保护剂对抗植物病原微生物和植物害虫。番茄采叶机Tuta absoluta(Meyrick)(鳞翅目:Gelechiidae)是南美和地中海盆地的主要番茄害虫之一。在目前的工作中,两种内生真菌Clonostachys spp的功效。球孢白僵菌和球孢白僵菌均针对绝对黑斑病幼虫进行了测试。通过在实验室中喷洒3种浓度(D1 = 4×107孢子/ ml,D2 = 4×106孢子/ ml和D3 = 4×105孢子/ ml)的真菌悬浮液评估杀幼虫效果,显示出显着的功效,取决于测试的菌株,施用浓度和暴露时间而变化。统计分析显示,两个内生幼虫的死亡率均比对照组高。15天后,将死去的幼虫木乃伊化。在温室实验中测试被分离株的应用证实了其比合成杀虫剂(Emamectin benzoat)具有显着的生物防治功效。幼虫的数量减少取决于幼虫与真菌孢子的接触时间。结果表明,两种内生真菌B. bassiana和Closnostachys spp。是对付绝对黑麦草的非常有效的昆虫病原真菌。实际上,本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。施用浓度和暴露时间。统计分析显示,两个内生幼虫的死亡率均比对照组高。15天后,将死去的幼虫木乃伊化。在温室实验中测试被分离株的应用证实了其比合成杀虫剂(Emamectin benzoat)具有显着的生物防治功效。幼虫的数量减少取决于幼虫与真菌孢子的接触时间。结果表明,两种内生真菌B. bassiana和Closnostachys spp。是对付绝对黑麦草的非常有效的昆虫病原真菌。实际上,本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。施用浓度和暴露时间。统计分析显示,两个内生幼虫的死亡率均比对照组高。15天后,将死去的幼虫木乃伊化。在温室实验中测试被分离株的应用证实了其比合成杀虫剂(Emamectin benzoat)具有显着的生物防治功效。幼虫的数量减少取决于幼虫与真菌孢子的接触时间。结果表明,两种内生真菌B. bassiana和Closnostachys spp。是对付绝对黑麦草的非常有效的昆虫病原真菌。实际上,本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。统计分析显示,两个内生幼虫的死亡率均比对照组高。15天后,将死去的幼虫木乃伊化。在温室实验中测试被分离株的应用证实了其比合成杀虫剂(Emamectin benzoat)具有显着的生物防治功效。幼虫的数量减少取决于幼虫与真菌孢子的接触时间。结果表明,两种内生真菌B. bassiana和Closnostachys spp。是对付绝对黑麦草的非常有效的昆虫病原真菌。实际上,本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。统计分析显示,两个内生幼虫的死亡率均比对照组高。15天后,将死去的幼虫木乃伊化。在温室实验中测试被分离株的应用证实了其比合成杀虫剂(Emamectin benzoat)具有显着的生物防治功效。幼虫的数量减少取决于幼虫与真菌孢子的接触时间。结果表明,两种内生真菌B. bassiana和Closnostachys spp。是对付绝对黑麦草的非常有效的昆虫病原真菌。实际上,本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。在温室实验中测试被分离株的应用证实了其比合成杀虫剂(Emamectin benzoat)具有显着的生物防治功效。幼虫的数量减少取决于幼虫与真菌孢子的接触时间。结果表明,两种内生真菌B. bassiana和Closnostachys spp。是对付绝对黑麦草的非常有效的昆虫病原真菌。实际上,本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。在温室实验中测试被分离株的应用证实了其比合成杀虫剂(Emamectin benzoat)具有显着的生物防治功效。幼虫的数量减少取决于幼虫与真菌孢子的接触时间。结果表明,两种内生真菌B. bassiana和Closnostachys spp。是对付绝对黑麦草的非常有效的昆虫病原真菌。实际上,本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。本研究揭示了梭菌的致病性。首次对付绝对黑穗病菌(T. absoluta)幼虫。
更新日期:2021-02-25
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