Q. How would you organically treat "hemlock wooly adelgids"

Answer

You can use horticultural oil (not dormant oil) to the point that it drips off.  You must be vigilant to spray the last week in April and the last week in September.  This must be done every year. This should get you control by smothering them at an immature stage.

  • Last Updated Jan 08, 2019
  • Views 26
  • Answered By Aska Gardener

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