Native insects and diseases cause problems, too.
Or, you can send samples to one our labs:
Caliciopsis Pine Canker
A native canker is posing a growing problem for pines across New Hampshire and several other eastern states. Caliciopsis pinea can be found in dense pine stands in sandy and well-drained soils. Signs of possible C. pinea infection include cankerous growths and significant sapping, as well as crown thinning and decreases in crown density.
White Pine Needle Damage
In recent years, landowners and foresters in the northeast have seen browning of white pine needles in the spring and early summer. Three fungi appear to be the culprits. They include Mycosphaerella dearnessii, Lophophacidium dooksii and Bifusella linearis.
Monitoring Eastern White Pine Decline and its Causes
Dramatic Needle Browning and Canopy Dieback of Eastern White Pine (Pinus strobus) in Southern New England UMass Extension, Spring 2016
Eastern White Pine Needle Damage Survey 2011
Forest Tent Caterpillar
Forest tent caterpillar is a native insect that is a natural part of our ecosystem. At times, as in the summer of 2016, forest tent caterpillars can cause extensive defoliation in hardwood forests. Defoliation can stress trees, but most trees will recover.
We will provide updates on outbreaks as more information becomes available.