Cottony Ash Psyllid

How to Detect CAPs

Due to their small size, their presence is usually noticed only when trees start showing stress. You'll see:

• thinning in the upper portion of the tree
• browning, yellowing and curling along the edge of leaves indicating a first generation psyllid population
• curled and misshapen leaves
• a cottony substance found within the curled leaves indicating a second generation psyllid population
• heavily damaged leaves can have a cauliflower appearance
• leaves may drop prematurely

Over time, their presence will weaken the ash trees, making them vulnerable to other illnesses and predisposing them to a premature death.