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A Novel Approach To Develop Biopesticides Based On Entomopathogenic Fungi
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/291638
Among the cultured products of Beauveria bassiana SFB-205 (KCCM 10892P), the supernatant showed the highest insecticidal activity against 2nd instars of Aphis gossypii (Aphididae) nymphs under glasshouse condition. The enzymes in the supernatant were confirmed as active materials, and the chitinase was finally selected as a QC factor for commercial production. However, the chitinase activity in the supernatant decreased by 11-folds due to the thermal stress at 50℃ for 2 h. To obtain thermal stability, the chitinase in the supernatant was adsorbed to a precipitable material and the pellet was freeze-dried (PCT/KR2007/005886). The adsorbent-A showed about 92.7% of harvesting efficiency which was higher than the other candidates. The chitinase activity of the freeze-dried powder was kept up about 82.0% of initial activity for the same thermal stress. Subsequently, an optimal formulation recipe was established to maximize long-term storage stability and efficacy. SFB-205 oil-based formulation was stable up to 18 months at room temperature. It showed 96.1% efficacy against 2nd instars of A. gossypii nymphs at 1 day after the treatment in the glasshouse. This novel approach can be a promising method to develop competitive biopesticies in the entomopathogenic fungi, even though it needs to be intensively studied.
