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The Influence of Temperature On Embryonic Development and Hatch in Meloidogyne Javanica

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For more content, see Nematology.

The optimum temperature for embryonic development (about 15°C) of Meloidogyne javanica is lower than that for eclosion (about 30°). The rate of hatch of second stage larvae was greater after 7 days pretreatment at 30° than at 20 and 25° ; thus there is no evidence that increased larval activity in the egg, caused by higher temperatures, reduces the subsequent rate of hatching. The results suggest that the number of larvae that hatch from a mixed population of embryos and unhatched larvae is determined by the rate of embryonic development and the rate of eclosion. Whichever process has the lower rate will control hatch and hence the optimum temperature for hatch lies somewhere between the optima for embryonic development and eclosion depending on the relative proportions of embryos and larvae in eggs.

Affiliations: 1: Division of Horticultural Research, C.S.I.R.O., G.P.O. Box 350, Adelaide, South Australia


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