Ambrosia beetle traps placed in young pecan trees at the north and south end of the Cook County Thursday (2/21/19) showed heavy ambrosia beetle attacks already. On the traps are frass filled, bird shot sized holes; some with the “frass toothpicks” coming out of the hole as the beetle chews into the log trap. Stressed pecan trees and pecan trees planted within the last 3 years are considered most vulnerable to these insects.
“What should you do once beetle activity is observed? Application of pyrethroids (bifenthrin, cypermethrin and permethrin) is the most effective control tactic. Application should be repeated at frequent intervals (7-10 days) until the trees have completely flushed out (and immediately if it rains). Any trees that show symptoms (toothpicks and holes) should be treated individually with a hand gun as soon as the attack is detected. Quick action is vital to have the best chance of saving the tree. It may be necessary for pecan growers to remove the plastic protective guards from the young trees in order to check for infestations and perform site-specific treatment. (Angel Acebes-Doria)”.
Below is an image that shows holes made by sap suckers (small woodpecker bird). These holes are not made by ambrosia beetle.