Infectivity of entomopathogenic nematode, Steinernema carpocapsae, as affected by the emergence time from the host cadaver
1997
Wang, X.D. (Saga Univ. (Japan). Faculty of Agriculture) | Kondo, E. | Ishibashi, N.
Selected morphometrics of Steinernema carpocapsae infective juveniles (IJs) and their infective behavior were investigated in relation to the harvest time. The body length was 631.8+-9.15, 594.0+-12.5, and 567.2+-11.5 mum for the IJs harvested on day 1, 4, and 8 from host cadavers of Galleria mellonella, respectively. The nictation rates of IJs correspondingly decreased from 22.1 % on day 1 harvest to 18.3 % and 9.2 % on day 4 and day 8 harvest, respectively. The infectivity of these three consecutive harvests was tested by one-on-one test, and also showed the decline of the mortality of host insects with increasing in the harvest time. These results suggest that the S. carpocapsae had two phases, the active and inactive host seeking periods to evade the risk of extinction
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