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Cold-Hardiness of Nematodes. I. Effects of Rapid Freezing On the Eggs and Larvae of Meloidogyne Incognita and M. Hapla 1 )

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For more content, see Nematology.

Meloidogyne hapla, a species of root-knot nematode that can survive freezing temperatures, and M. incognita a species that cannot, were observed while being frozen on a microscope stage where temperatures could be lowered to -40° ± 0.1° C at a maximum rate of 10° C/min. Eggs and larvae survived for short periods in supercooled water and in ice, but formation of internal ice was lethal to both species. At a lower rate of cooling, 1° C/min., there was no difference in the ability of the two species to survive subzero temperatures. However, when larvae were frozen in physiological salt solution or egg-masses were stored for long periods at temperatures slightly above freezing and then frozen, significantly more M. hapla survived than did M. incognita.

Affiliations: 1: Canada Department of Agriculture, Harrow, Ontario


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