Overwintering and Cold Tolerance of the Mermithid Filipjevimermis leipsandra

Kent D. Elsey


Overwintering survival of Filipjevimermis leipsandra postparasitic adults ranged from 12 to 15% over 2 years. Nematodes recovered from biweekly samples oviposited within a week when exposed to warm temperatures. More nematodes were recovered from the lower portions of soil cores than from the upper. In laboratory tests of cold tolerance, the LD[sub5][sub0] at -5 C was 5.5 hours, whereas exposure to -2 C for as long as 96 hours resulted in no mortality. Key words: cold tolerance, cucumber beetle, Diabrotica balteata, Filipjevimermis leipsandra, mermithid, overwintering.

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