温湿度及酸碱度对南方根结线虫生长发育的影响

通过室内不同温湿度及酸碱度条件培养,观察温湿度和酸碱溶液对南方根结线虫(Meloidogyne incognita)卵孵化和2龄幼虫(J2)存活的影响,为南方根结线虫种群动态的准确预测和科学防治提供理论依据。结果表明:南方根结线虫卵孵化的适宜温度范围是15～30℃,J2适宜存活的温度是10～25℃;土壤含水量在10%～30%内,南方线虫均可生长发育,但含水量为30%时,对卵孵化和J2存活均具有明显的抑制作用;pH 5～8时,南方根结线虫卵孵化率与J2存活率均较高,表明该虫在弱酸弱碱和中性环境中更易生存。由此可见,不同的温湿度和酸碱溶液对南方根结线虫卵孵化和J2存活均有显著影响。

Effects of Temperature, Humidity and Acidity-alkalinity on Growth and Development of Meloidogyne incognita

The influence of temperature,humidity and acid-base solution on hatching and survival of second-stage juveniles(J2) of M.incognita was examined through indoor breeding under corresponding condition.The results showed that the optimum temperature was 15～30℃ for hatching of M.incognita while 10～25℃ for survival of J2.The adaptive moisture range was wide.It was tolerable for M.incognita to grow and develop when the soil moisture content was 10%～30%.However,the soil moisture content over 30% had the negative effect on hatching and survival of J2 of M.incognita significantly.Under the condition of weakly acidic,alkaline and neutral environment(pH 5～8),M.incognita had the higher rate of hatchability and livability for J2.In conclusion,temperature,moisture and acid-base solution were important factors which could observably influence hatching and survival of J2 of M.incognita.