This will allow for natural predators to build up. However, the spring generation often cause twisting of the needles and this distortion on some trees may not be acceptable. Summer Insecticide Sprays - Insecticide sprays will usually kill the active adelgids anytime during the growing season. However, summer sprays will not kill the migrating forms which arrive in the fall, and needle damage may have already occurred in the spring. See Bulletin 504 for currently registered insecticides.
Thorough coverage is needed on the inner branches where most of the adelgids attach for the winter.
See Bulletin 504 for currently registered insecticides. Eggs will probably be laid by 100 DD 50 . The time between first wax production and egg laying is ideal for insecticidal control. During the last two years of growth, sprays can be applied so as to produce a good looking product for sale. The older damaged needles will not be evident at cutting time.