Pine problems

Asked September 8, 2017, 4:05 PM EDT

I have several dying pines. I'm sampling for nematodes, but wonder what the other possibilities are. This tree looks worst. Small galleries, sawdust around base. The sample I took for nematodes does have blue staining starting on the inside.

Boulder County Colorado trees and shrubs

1 Response


I'm sending you links to several facts sheets related to your pine tree. One is pine wilt disease caused by nematodes. I don't know what species you have but this may be helpful.

      You can bring in a sample for diagnostics to the Boulder County Extension office in Longmont. This is what the fact sheet says about diagnoses:
      The only certain way to diagnose pine wilt is to submit a wood sample to a diagnostic lab for extraction and confirmation of the presence of PWN. Diagnosticians usually require for analysis a one inch (2.5 cm) thick sample of wood from the trunk (pie slice, wafer, etc.) or a wilted branch that is 6 inches (15 cm) long and 2-3 inches (5-7.5 cm) in diameter taken nearest the trunk. Because the distribution of the PWN in a tree can be non-uniform, it is best to collect at least two samples from different parts of the tree.
      I don't think the bore holes are from the Mountain Pine needle because there are no you pitch tubes Pitch tubes
      Boulder County Master Gardner office