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Craig from Williamsport, Pa writes

What is the best time of year to apply Safari 20 SG as a trunk spray for Hemlock Adelgids in northern PA?

I want to avoid impacting the bees while still being most effective for the trees. Also, would you please confirm the proper mix ratio?

Answer:

Per page 9 of the Safari 20SG supplemental label for basal trunk spray the rate will vary depending on your dilution rate.  You would use 12 – 24 oz per gallon of water.  Depending on bark type and thickness, one gallon of spray solution will typically cover 65-85” of cumulative trunk diameter.  This article from the Penn State Extension has excellent tips and information about the life cycle of this complex pest. We recommend contacting your County Extension Office for specific timing recommendations.

Answer last updated on: 11/01/2016

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