温度对南方根结线虫存活的影响

Effects of Temperature on the Survival of Meloidogyne inicognita

通过室内和田间试验相结合的方法,研究了温度对南方根结线虫存活的影响。结果表明,28℃是南方根结线虫卵囊孵化的最佳温度,13℃下不适宜卵囊孵化,但有少量卵囊可孵化出二龄幼虫（J2）,2℃下卵囊不能孵化。J2在13℃下存活时间最长,可存活30 d;13℃以上和以下J2存活时间都缩短,-12℃以下不能存活。田间调查发现,温度对南方根结线虫的存活有显著的影响,土壤线虫数随大气温度的降低数量减少。11月中旬0~5 cm土层线虫数最多,12月5~10 cm土层线虫数最多;12月以后土壤线虫总数减少,10~15 cm土层线虫数最多;翌年2月中旬线虫数量接近0。

The effect of temperature on the survival of Meloidogyne inicognita is studied with the method of laboratory and field experiments. The result shows that the optimum temperature of the Meloidogyne inicognita. egg hatching is 28 degrees,and 13℃ is not suitable for hatching oocysts,but there is a small amount of oocysts hatched J2（second stage of juveniles）,2 ℃ oocysts couldn＇t hatch. The longest time for J2 survival is 30 days,which can survive at 13 ℃;the J2 survival time is shortened at 13 ℃above and below,-12 C below of the low temperature can not survive. The field survey found that the temperature had a significant effect on the survival of the Meloidogyne inicognita. The number of soil Meloidogyne inicognita. decreased with the decrease of atmospheric temperature. In addition,the large number of Meloidogyne inicognita is occurred in soil 0~5 cm of late December,and5~10 cm of mid-November,and 10 ~ 15 cm After 12 months. The number of soil Meloidogyne inicognita. is decreased;the number of Meloidogyne inicognita. close to 0 in mid February next year.