Laboratory Efficacy of Insecticidal Fungi for Control of Spodoptera frugiperda
發布時間：
2020-07-13
Laboratory Efficacy of Insecticidal Fungi for Control of Spodoptera frugiperda
Chinese Journal of Biological Control
Spodoptera frugiperda (J. E. Smith) is a global major pest warned by FAO. To evaluate for potential of insecticidal fungi for control of S. frugiperda, we investigated theactivities of entomopathogenic fungi CQMa421 and ZJU435 against the larvae, pupae, adults and eggs of S. frugiperda and its effects on egg hatching and pupal eclosion under laboratory conditions. The results showed that Metarhizium anisoplae strain CQMa421 and Beauveria bassiana strain ZJU435 had larvicidal activity against
S. frugiperda young instars. The corrected mortality of the 1st instar larvae was 35.6% and 50.5% 10 days post inoculation of CQMa421 and ZJU435, respectively. With the increase of larval instar, the efficacy of the two fungal strains decreased, CQMa421 almost failed to infect the 4th instar larvae. Both CQMa421 and ZJU435 caused pupal melanization of S. frugiperda, and significantly reduced pupal eclosion by about 60% compared with the control group. However, CQMa421 and ZJU435 had no insecticidal activities to adults and did not affect female oviposition. In addition, the hatching rates of eggs inoculated with CQMa421 or ZJU435 were 82.8% and 90.7%, respectively, significantly lower than that of the control (100%). Further investigation revealed that the survival rate of the newly hatched larvae from eggs inoculated with CQMa421 or ZJU435 was reduced to 20.8% and 0.0%, respectively, and were significantly lower
than that of the control (79.4%). These results indicated that CQMa421 and ZJU435 had great potential for control of S. frugiperda.
Key words: Spodoptera frugiperda;Metarhizium anisopliae;Beauveria bassiana; insecticidal activity
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