Swarms of adult insects may be observed and eggs laid in leaves. In forested areas, adult emergence, flights and tree attacks may begin. Overwintered stages on trunk move to twigs and feed. Injury by banks grass mite increases. Clover mite populations should be decreasing.
First generation begins.
Nymphs have hatched and begin to damage new growth. Forest tent caterpillars are also active. Slugs may cause peak damage to seedlings during cooler weather. Eggs hatch and young nymphs move to feed on new growth. Galls are initiated.