Look for a papery case attached to the bottom of a leaf, a tiny larvae can be found inside the case. Some chemical control can be achieved if applied at the first sign of leaf damage. Taxus which appear weakened and yellow may also be infested with the Taxus mealybug. Open up the foliage to look for small, bright white mealybug nymphs on the interior branches. They are not noticeable from the outside of the foliage.
Chemical control is no longer effective as females are maturing and getting ready for reproduction.
Gypsy moth larvae are becoming more noticeable as their appetites are increasing with their size. They are dark, very hairy and have series of blue and red pairs of dots along their backs. Try placing a burlap sheet around the base of infested trees to provide shelter for the larvae during the day. The larvae can be manually destroyed once collected in the burlap. Viburnum leaf beetle larvae are actively feeding at this time.