In a preliminary experiment four times as many M. javanica entered tomato roots as did M. hapla but their growth rates were not significantly different. Experiments on the influence of a range of temperatures on hatching, mobility, invasion and growth indicated that M. hapla had a thermal optimum of 25° C for hatching, 20° C for mobility and 15° C (8 hours) -20° C (16 hours) for invasion and grew well at 20° C (8 hours) -25° C (16 hours). M. javanica had a thermal optimum of 30° C for hatching, 25° C for mobility a wide temperature range for invasion and a thermal optimum of 25° C (8 hours) -30° C (16 hours) for growth. Thus, the two species have different temperature optima and in both species the stages of growth and development both in the egg and the plant have higher thermal optima than the stages exposed to the soil environment.
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Wallace et al. (1965) studied this question.