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Observations On the Fecundity and Longevity of Tylenchus Emarginat Us On Sitka Spruce Seedlings At Different Temperatures

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Tylenchus emarginatus fed and reproduced on sitka spruce seedlings growing in water agar without obviously damaging them. Temperature changes between 15°-25°C affected the rate eggs were laid and longevity of the nematodes but not the total viable eggs produced. The generation time at 25° was between 5 and 6 days. Indications were acquired that nematodes did not reproduce at 30° or at temperatures below 10° and eggs failed to hatch after incubation at these temperatures. T. emarginatus can rarely reproduce in the field between November and April and probably overwinters in juvenile and adult stages.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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