It tends to be a little wider-bladed than Kentucky bluegrass and a little lighter green, but these qualities are generally not greatly noticeable. Avoid perennial ryegrass in lawns because it is susceptible to many diseases. Also avoid annual ryegrass because it will live for only one year or less and then need reseeding. With all the hubbub about gypsy moths, it seems that everyone with a caterpillar thinks they have gypsy moths. The general rule for caterpillar control is that you can kill them most easily when they are small.
Larger caterpillars are harder to kill.
When they are in their wandering phase and are searching for a place to pupate, they are really difficult to kill because they hardly feed at all. Young caterpillars can be killed with BT or conserve sc. Older caterpillars can be killed with Sevin or a pyrethroid material. Walnut and Yellow Necked Caterpillars Walnut and Yellow Necked Caterpillars are similar to one another except that the walnut caterpillar feeds on walnut. Yellownecked Caterpillar feeds on most deciduous trees.