| Autor: |
Gu, Maiqun, Tian, Jiaxin, Lou, Yulu, Ran, Jia, Mohamed, Amr, Keyhani, Nemat O., Jaronski, Stefan, Wang, Guangmin, Chen, Xuanyu, Zang, Lian-Sheng, Zhang, Wei |
| Zdroj: |
Entomologia Generalis; December 2023, Vol. 43 Issue: 6 p1211-1219, 9p |
| Abstrakt: |
The fall armyworm (FAW), Spodoptera frugiperda is a notorious agricultural pest with significant developmental stage dependent control challenges. Entomopathogenic fungi are promising biological control agents for FAW management, including when combined with other control measures. Here, we isolated a strain of Metarhizium rileyi (GZUMr46) and first tested its virulence and compatibility with Bacillus thuringiensis (Bt) and/or a chemical pesticide, emamectin benzoate, in laboratory bioassays. The laboratory bioassays using 108 spores/ml of M. rileyi showed ~70% mortality of FAW 2nd and 4th instars, 5 d post-topical inoculation. We then tested the efficacy of M. rileyi with Bt, sex pheromone, emamectin benzoate, and/or the parasitoid Telonomus remus against FAW in field assays. For the field applications, M. rileyi granules were produced by liquid-solid dual fermentation using different grains, with conidial production reaching 8.3 × 109 conidia/g substrate after 25 d of fermentation. In the field trials, application of the M. rileyi granules alone reduced FAW larval populations by > 60%, with a 40% reduction in plant damage compared to controls. When any of the other four control measures were used in combination with M. rileyi granules, 50–70% reductions in larval populations were observed, and undamaged plant levels improved from 16–37% to 48–79%. These results support a practical integrated pest management protocol by combining the use of M. rileyi granules with either sex pheromone, T. remus, emamectin benzoate, and/or Bt for the successful control of FAW. |
| Databáze: |
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