
Gypsy Moths are cyclical. Every 5-7 years the population builds. Mild winters and drier springs allow populations to build faster, creating years of severe defoliation.
If additional stress factors are put on the tree, such as drought, fire, soil compaction, disease, the tree may not be able to recover. Deciduous trees often send out another set of leaves and can survive the defoliation if no other stresses are present.
Not at this time. The DCNR program is based on a partnership with the county. Currently, the Lebanon County Conservation District has been informed that no county funds will be budgeted for future spray programs in the county. In addition, many municipalities are also making budget cuts and are excluding gypsy moth spraying.
Adult gypsy moths lay their eggs between June and July. You can scout your property anytime between July 15 and March 31st for eggs. If you are able to find over 7 new egg masses within a 15 foot radius, you have an infestation that typically would meet state requirements and can expect noticeable defoliation. Egg counts higher than seven per 15 foot radius will dictate severity of defoliation. Take the necessary precautions and plan early. Aerial and ground applicators should be contacted by March so trees can be treated in early May. If you plan to use a more local treatment for control, be sure burlap, tanglefoot, or other control measures are in place by mid to late April. This will ensure a more effective control as your efforts are targeting the larvae at their most susceptible life stage.
Research aerial and ground applicators. Obtain cost estimates. See Homeowners Guide for additional tips for controlling the gypsy moth.
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