Use Orthene 2 to 3 times at 7 to 10 intervals when crawlers are present. Diazinon, malathion or Sevin may also be used when crawlers are active. Pine needle scale crawlers are usually active when the lilacs are in full bloom. Pine spittle bug lives and hides in a foamy mass. Use Orthene when the insects are first seen.
Mites cause older needles to become yellowed or stippled.
Diazinon should control the problem. Zimmerman pine moth larvae bore into the trunk. The only outward symptoms may be death of parts of the tree or masses of hardened pitch on the branches. No chemical control is listed The larvae of pine weevils feed on the sapwood of the leaders. The leader is killed and the shoots replacing it are distorted.