When you are tiptoeing through the tulips, look for gypsy moth eggs, which are about to hatch. Destroying the egg cocoons will reduce damage to shade trees.
The egg masses are tan, about 1 1/2 inches long, and look and feel like felt, according to the Maryland Home & Garden Information Center. Search for them on tree bark, firewood, lawn furniture and other outdoor structures. Scrape them off and place in alcohol or a bleach solution.