Viburnum leaf beetle adults are finished mating and laying eggs on stems at this time. Look for these brown bumps in rows on the undersides of twigs and prune out infested twigs before April, 2001. Japanese beetle adults have finished peak flight and populations are dwindling. Egg-laying in grassy areas continues and egg hatch should be beginning any time now. Adult feeding injury appears as irregular holes and skeletonizing of leaves.
Chemical control is more effective when applied during peak flight.
Despite the cool summer temperatures, leafhopper populations are high in the landscape and field. Look for tiny yellow-green insects that jump quickly when disturbed. Leafhoppers feed with piercing mouthparts that leave stipule marks of the foliage, giving it a yellowish or bronze appearance. Rotate between chemical families to prevent insect resistance. Chemical control is difficult since leafhoppers are easily disturbed and will leave an area that is being sprayed, to come back later.