Olatinwo Rabiu, Becker J Ole, Borneman James
Department of Plant Pathology and Nematology, University of California, Riverside, CA 92521.
J Nematol. 2006 Sep;38(3):345-8.
The effects of Dactylella oviparasitica strain 50 applications on sugarbeet cyst nematode (Heterodera schachtii) population densities and plant weights were assessed in four agricultural soils. The fungus was added to methyl iodide-fumigated and nonfumigated portions of each soil. The soils were seeded with Swiss chard. Four weeks later, soils were infested with H. schachtii second-stage juveniles (J2). Approximately 1,487 degree-days after infestation, H. schachtii cyst, egg and J2 numbers and plant weights were assessed. In all four fumigated soils, D. oviparasitica reduced all H. schachtii population densities and increased most of the plant weights compared to the nonamended control soils. In two of the nonfumigated soils (10 and SC), D. oviparasitica reduced H. schachtii population densities and increased most plant weight values compared to the nonamended control soils. For the other two nonfumigated soils (44 and 48), which exhibited pre-existing levels of H. schachtii suppressiveness, fungal applications had relatively little impact on H. schachtii population densities and plant weights. The results from this study combined with those from previous investigations suggest that D. oviparasitica strain 50 could be an effective biological control agent.
在四种农业土壤中评估了寄生卵孢菌50菌株的施用对甜菜孢囊线虫（甜菜孢囊线虫）种群密度和植株重量的影响。将该真菌添加到每种土壤经甲基碘熏蒸和未熏蒸的部分。土壤播种了瑞士甜菜。四周后，土壤接种了甜菜孢囊线虫的二期幼虫（J2）。侵染后约1487度日，评估了甜菜孢囊线虫的孢囊、卵和J2数量以及植株重量。在所有四种熏蒸土壤中，与未改良的对照土壤相比，寄生卵孢菌降低了所有甜菜孢囊线虫的种群密度，并增加了大多数植株的重量。在两种未熏蒸的土壤（10号和SC）中，与未改良的对照土壤相比，寄生卵孢菌降低了甜菜孢囊线虫的种群密度，并增加了大多数植株重量值。对于另外两种未熏蒸的土壤（44号和48号），它们表现出预先存在的对甜菜孢囊线虫的抑制水平，真菌施用对甜菜孢囊线虫的种群密度和植株重量影响相对较小。本研究结果与先前调查结果相结合表明，寄生卵孢菌50菌株可能是一种有效的生物防治剂。
