Pathogenicity of four entomopathogenic nematode strains against Asian corn borer, Ostrinia furnacalis (Guenée), in Vietnam
2018
Nguyen, Chau N. | Do, Anh T. | Hoang, Phuc K. | Truong, Lam X.
The virulence and reproductive capacity of four indigenous entomopathogenic nematode (EPN) strains, S-PQ16 (Steinernema sp. PQ16), S-TX1 (Steinernema sangi TX1), S-DL13 (S. siamkayai DL13) and H-NT3 (Heterorhabditis indica NT3), against the last instar larvae of Asian corn borer (ACB), was evaluated. With moderately low concentrations of infective juveniles (IJ) from 10 to 100 IJ insect⁻¹, the ACB larvae were found to be susceptible to all four EPN nematode strains after exposure for 24, 48, 72, 96 and 120 h. The 100% mortality of ACB larvae by these indigenous EPN strains occurred after 96-120 h of exposure. The low LC₅₀ values (between 21.7 and 27.9 IJ) indicated the high virulence of these four EPN strains to ACB larvae. The highest yield of IJ produced inside the insect cadavers for S-PQ16, S-TX1, S-DL13 and H-NT3 was 215.0 ± 6.5 × 10³, 83.1 ± 4.9 × 10³, 67.8 ± 7.2 × 10³ and 225.2 ± 6.4 × 10³ IJ, respectively, with low inoculated concentrations of between 30-50 IJ. The results, showing a high degree of virulence and high reproduction capacity, suggest that these indigenous EPN strains have great potential for biological control of the Asian corn borer.
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