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- 저자 : Ajuna Henry (검색결과 2 건)
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Aphicidal activity of Bacillus thuringiensis strain AH‐2 against cotton aphid (Aphis gossypii)
Ajuna Henry B.,Kim Iksoo,Han Yeon Soo,Maung Chaw Ei Htwe,Kim Kil Yong 한국곤충학회 2021 Entomological Research Vol.51 No.4
Bacillus thuringiensis (Bt) is the most commercialized entomopathogenic species. However, the low efficacy against notorious sap‐sucking Hemipteran pests and the high costs of production, reduce the applicability of Bt biopesticides. In this context, B. thuringiensis AH‐2 (Bt‐2) isolated from soil was found to release parasporal inclusions and aphicidal activity. Bt‐2 showed optimal growth at pH 8 and 30°C in tryptic soy broth (TSB) and maintained normal growth when cultured in cost‐effective test media, pink brown (PB), supplemented with either glucose (PBG) or sucrose (PBS). To study aphicidal activity against cotton aphid (Aphis gossypii), Bt‐2 and a commercial B. thuringiensis subspecies kurstaki (Btk) were used. Using third nymph (3 N) instars, treatment with Bt‐2 caused 70.2, 78.1 and 88.4% mortality at 10, 25 and 50% culture concentrations, respectively. Similarly, Btk resulted in 79.9, 80.4 and 92.9% mortality at 10, 25 and 50%, respectively. When cultured in TSB, PBG and PBS media, Bt‐2 culture (50%) resulted in 85.9, 82.9 and 82.2% 3 N mortality, respectively. Equally, Btk caused a mortality of 79.9, 78.9 and 78.9% in TSB, PBG and PBS, respectively. Bt‐2 exerted a notably higher aphicidal efficacy at 24 h after treatment compared to Btk, especially at low concentration. Moreover, both Bt strains significantly suppressed adult fecundity compared to control. At 50% culture concentration, Bt‐2 and Btk suppressed adult fecundity by 98.3 and 91.1%, respectively. Our result demonstrates a strong aphicidal efficacy of Bt‐2, and its potential production using cost‐effective PB medium.
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이동률,Chaw Ei Htwe Maung,Ajuna Henry,김길용 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.2
The melanose disease causing Diaporthe citri is important pathogen in citrus plants worldwide. Currently, there are few researches related to biological control of melanose disease. In this study, we investigated control of Diaporthe citri by Bacillus amyloliquefaciens Y1 isolated from the soil. Low-cost fertilizer based PB medium and large-scale fermenter have been developed for field application of biological control. We prove that Y1 can be successfully grown in large-scale fermenters using PB medium without contamination. In addition, Y1 bacterial culture filtrates (BCF) of large-scale cultivation in PB medium (LP-Y1), present better growth inhibition of D. citri than small-scale cultivation in TSB medium (ST-Y1). Microscopic observations also showed that pathogen mycelial morphology was significantly affected by BCF, presumably due to metabolites produced by Y1. Finally, in pot experiment, pre-treatment with fungicide and Y1 to leaves significantly reduced disease incidence compared to the control group. This study showed that Y1 incubated with fertilizer based medium inhibited the occurrence of D. citri and could be grown in large scale field conditions without contamination as well as cost optimization.
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