Persistence of <Emphasis Type="Italic">Isaria fumosorosea</Emphasis> (Hypocreales: Cordycipitaceae) SFP-198 Conidia in Corn Oil-Based Suspension |
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Authors: | Jae Su Kim Yeon Ho Je En Ok Woo Jong Sung Park |
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Institution: | (1) Entomology Research Laboratory, Department of Plant and Soil Science, University of Vermont, 661 Spear Street, Burlington, VT 05405-0105, USA;(2) Dongbu Advanced Research Institute, Dongbu HiTek Co. Ltd., Daejon, 305-708, Republic of Korea;(3) School of Agricultural Biotechnology, College of Agriculture & Life Science, Seoul National University, Seoul, 151-742, Republic of Korea |
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Abstract: | Long-term persistence of entomopathogenic fungi as biopesticides is a major requirement for successful industrialization.
Corn oil carrier was superior in maintaining germination rates of Isaria fumosorosea SFP-198 conidia during exposure to 50°C for 2 h, when compared with other oils, such as soybean oil, cottonseed oil, paraffin
oil, and methyl oleate. The corn oil-based conidial suspension (91.6% germination) was also better in this regard than conidial
powder (28.4% germination) after 50°C for 8 h. Long-term storage stabilities of corn oil-based conidial suspension and conidial
powder at 4 and 25°C for 24 months were investigated, based on the correlation of germination rate with insecticidal activity
against greenhouse whiteflies, Trialeurodes vaporariorum. Viability of conidia in corn oil was more than 98.4% for up to 9 months of storage at 25°C, and followed by 23% at 21 months.
However, conidial powder had only 34% viability after 3 months of storage at 25°C, after which its viability rapidly decreased.
The two conidial preparations stored at 4°C had better viabilities than those at 25°C, showing the same pattern as above.
These results indicate that corn oil-based conidial suspension can be used to improve conidial persistence in long-term storage
and be further applied to the formulation of other thermo-susceptible biological control agents. |
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