I walked out this morning and noticed that a branch on my bald cypress had died. I had noticed some oozing previously but didn't give it a lot of lot. I'm now thinking borers. Any other ideas?
Update: Bob Gilbert and Rodney both confirmed that the problem is borers. So far it looks like I'll only lose one branch. Rodney notes:
"I think you and your Bald Cypress will be fine since the borers were high up in the tree. Bald Cypress compartmentalize quite well and flood the borer tunnels with sap. It was Mother Natures way of playing Bonsai Artist ( and she's always has the final say). I agree with you on using the "nasties"---- that's why I push so hard on coming out of Winter bug free. What you can use for dormant tree spray are the safest chemicals to use." Rodney
One of the "nasties" Rodney was referring to is a systemic called Lindane. It was removed from the market several years ago over concerns that it caused neurological damage (among other things).
Rodney advised that if I detected further activity, I should inject the borer holes with insecticide and then seal. I have removed the dead branch and cleaned the sap from the tree with alcohol and am now watching for additional damage. I've also ordered a horticultural syringe and needle just in case.
Last tidbit...
Rodney advises that borers enter in January and that damage shows up in August (right on schedule). That's why it's best to dormant spray trees in winter and then treat with Bayer's Tree and Shrub in the spring.
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