Assertion: clover's activity | /r/HasAspect | residual activity
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Source sentences:
text: 2,4-D has only a short residual activity (two to three weeks) and should not pose many problems, but dicamba (Banvel or Weedmaster) has a 120 day residual activity and picloram (Grazon P+D) has residual activity up to one year after spraying.