Ramorum Shoot Dieback

Symptoms associated with Phytophthora ramorum infections include needle blight, a shoot blight resulting from needle infections, and stem lesions resulting from the growth of the pathogen from infected newly emerging needles/shoots into older wood. Symptoms are similar to Botrytis shoot blight on young seedlings.

Remove infected material promptly and improve air circulation. Avoid overhead irrigation that prolongs leaf wetness. For persistent problems, consult WSU Extension for current treatment recommendations.