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Effects of interval between the first and second augmentation of soil with Steinernema riobrave on numbers of S. riobrave (A–B) or Tylenchulus semipenetrans (C–D) recovered from soil that was augmented once or twice with the nematode. Numbers above symbols represent the percentage reduction in numbers of nematodes from soil augmented twice compared to once. Significant treatment differences according to Student's t-test are denoted by **(P ≤ 0.01) and ***(P ≤ 0.001).
