Pine Wilt Disease in Connecticut
CRITICALDisease
Pine Wilt Disease is currently active in Connecticut. Watch your susceptible trees closely and act early.
About Pine Wilt Disease
A lethal disease of pines caused by the pinewood nematode, which is transmitted by pine sawyer beetles (Monochamus spp.). It causes rapid wilting and death of susceptible pine species, particularly non-native Scots pine and Austrian pine. The nematode clogs resin canals and destroys cells lining them, leading to cessation of resin flow and rapid desiccation. Trees typically die within weeks to months of symptom onset.
Symptoms to watch for
Rapid browning and wilting of entire tree within weeks, needles turn grayish-green then tan-brown but remain attached, no resin flow when bark is cut (healthy pines bleed resin), wood appears dry when cut, affects entire tree rather than individual branches, most common in mid to late summer
Trees at risk in Connecticut
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Treatment options
Rapid Removal and Destruction
Remove and destroy (burn or chip) infected trees promptly before spring to prevent sawyer beetles from emerging and spreading the nematode to nearby pines. Do not store pine wood from infected trees.
Preventive Nematicide Injection
Trunk injection of abamectin (Greyhound, Arbormectin) in fall can protect high-value pines preventively. Must be applied before infection occurs. Repeat annually.
Recommended Products & Tools
Helpful supplies for managing Pine Wilt Disease. Always read and follow label directions, and confirm a diagnosis before treating.
Protectant spray for many bacterial and fungal diseases.
For the rare case sealing is advised (e.g., oaks in oak-wilt season).
Sharp, clean cuts to remove affected wood — a tree-care essential.
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Browse all Connecticut arborists →Frequently asked questions
Is Pine Wilt Disease in Connecticut?
Pine Wilt Disease is currently active in Connecticut. Watch your susceptible trees closely and act early.
What does Pine Wilt Disease look like?
Rapid browning and wilting of entire tree within weeks, needles turn grayish-green then tan-brown but remain attached, no resin flow when bark is cut (healthy pines bleed resin), wood appears dry when cut, affects entire tree rather than individual branches, most common in mid to late summer
What trees does Pine Wilt Disease affect in Connecticut?
It affects Eastern White Pine, Ponderosa Pine. Susceptibility varies by species.
How do I treat Pine Wilt Disease?
Options include: Rapid Removal and Destruction, Preventive Nematicide Injection. Confirm the diagnosis before treating, and consider a certified arborist for high-value trees.