Having my usual spring battle with insectisoids.

great progress against the tent caterpillars via BT courtesey of advice from various members here on the forum.

thees are leafing out, some are just beginning to flower.

trees are in their 4th spring, all are mulched liberally with wood chips.

Now I notice some trees with some curled and browned leaves. All the affected trees seemed to have ants on them. No obvious evidence of anthills at the base of the trees.

suggestions anyone?