They decimate our cherry trees bad and hit hazelnuts and chestnuts. If caught early I can spray if trees aren’t to tall. I’ve had the cherry trees completely defoliated before but leaves grow back, stunts that years growth.
I’ve started spraying for them at first sight in late spring now. Some years are really bad others hardly see any…closer lots of fields of soybeans are planted combined with a wet spring and they seem to be worse.
Would be great if birds or praying mantis or wasps would help out with them.