Effect of recycling temperature on the infectivity ...

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Title Effect of recycling temperature on the infectivity of entomopathogenic nematodes
Author(s) G. B. Jagdale, R. Gordon
Journal Canadian Journal of Zoology
Date 1997
Volume 75
Issue 12
Start page 2137
End page 2141
Abstract Four strains of entomopathogenic nematodes were recycled in vivo for 2 years at temperatures ranging from 10 to 25 degrees C before the infectivity of their juveniles was compared. Infectivity was examined by measuring LC50 values for Galleria mellonella larvae at bioassay temperatures ranging from 5 to 25 degrees C. Of the 4 strains examined, only the Umea and NF strains of Steinernema feltiae that had been recycled at 10 degrees C infected and killed the insects at a bioassay temperature of 5 degrees C. The S. carpocapsae All and S. riobravis [Steinernema riobravae] TX strains were infective at 10 degrees C only when the recycling temperature was <=20 degrees C. The infectivity of the 2 strains of S. feltiae at 10 or 15 degrees C was compromised by propagating them at higher temperatures (20-25 degrees C). The Umea strain of S. feltiae displayed an impaired capacity to infect hosts at higher temperatures (20-25 degrees C) when recycled at lower (<= 15 degrees C) temperatures. The capacity of these nematodes to adjust to different recycling temperatures is discussed in relation to their infectivity in different field situations..

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