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Eggs of Meloidogyne naasi populations from Belgium, France, Germany, Wales, New Zealand and U.S.A. (California) were hatched at 20°C after incubation at constant temperatures (between 0° and 40°C) for periods up to 20 weeks. Pre-treatment hatch was low for all populations at all temperaturcs. The majority of eggs of all populations hatched at 20°C following "chilling" (temperatures in the range of 0° to 15°C for a minimum time of 6 weeks) but the most favourable combination of temperature and time of incubation varied with population. Hatch at 20°C was also increased by incubation at "warm" temperatures (25° to 35°C) in all populations, but the effect was more variable and less marked than chilling temperatures. Embryonation was delayed or stopped at temperatures below 15°C and above 30°C but was resumed following transfer to 20°C. High mortality was recorded at temperatures above 30°C. Infectivity of artificially hatched juveniles was less than that of those which emerged following a chilling period.