Conifer Pest and Disease Update 5/15/2023

In this edition:

  • Insects – Pest Scouting with growing degree-days (250-600 GDD50)
    • Scales
    • Mites
  • Diseases
    • Needle casts (Rhabdocline and Swiss needlecasts – Douglas fir, & Rhizosphaera – spruces)
    • Phytophthora
  • Soil fertility – resources

Please click “read more” below to get updates on pests, diseases, and other important resources for the week of 5/15/2023.

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Hold on to Your Needles!

As the weather warms, Christmas tree growers and nursery folks are beginning to get back into their fields to select trees for digging or to assess field conditions. Recent samples in the Plant Diagnostic Laboratory suggest it would be prudent to keep an eye out for disease symptoms and signs that would have appeared or intensified over the winter. [Read more…]