施麦粒提高淡紫拟青霉对大豆孢囊线虫田间防效

 田间试验了施麦粒(Wg)对淡紫拟青霉Paecilomyces lilacinus菌株Ps-266(Ps)防治大豆孢囊线虫Heterodera glycines(SCN)的影响.Ps菌液(2×10⁷CFU/mL) 3000mL/hm²拌加入碎麦粒75kg播前2d,20d和40d处理土壤.播后35d和95d的SCN2龄幼虫、白雌虫和孢囊数量均显著低于Ps单用处理,而大豆产量显著提高(P≤0.05).3个Ps+Wg同剂量处理中,播前40d处理,对SCN幼虫孢囊的控制效果和大豆产量均显著高于播前2d和20d处理.由此揭示了淡紫拟青霉作为线虫生防剂的应用中,时间的提前量和辅料问题值得重视.

Application of Wheat Groats for Promoting Efficacy of Paecilomyces lilacinus for Control Heterodera glycines in Field

Field trials were conducted to evaluat influence of wheat groats(Wg) application on the efficacy of nemotophagous fungus Paecilomyces lilacinus strain Ps-266(Ps) against soybean cyst nematode Heterodera glycinus(SCN) and soybean yields.Numbers of second stage juvenil(J₂),femal and cyst of SCN in the samples collected 35 and 95 days after sowing were significantlly reduced(P≤0.05) by three treatments of Ps(2×10.7CFU/mL) 3000mL+Wg75kg/hm² before sowing.Where as the Ps only treatment coused a nonsignificant reduction of J₂,femal and cyst.Within the 35 days after sowing and the yields of soybean were lower than those of Ps+Wg treatments significantlly(P≤0.05).Among the three Ps+Wg treatments, application made 40 days before sowing acquired higher nematode reduction and higher soybean yields than the same application 20 and 2 days before sowing.This study indicated that, the using of supplemants and the right timeliness before sowing would be much important in the application of P.lilacinus as a nematode biological contral agent.