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Extension specialists at workshop urge egg‑mass surveys, starch testing and stand resilience as first lines of defense
Summary
Speakers at the workshop emphasized stand‑level monitoring (egg‑mass surveys and traps), root‑starch testing to assess tree vigor, and longer‑term sugarbush resilience measures (liming, reduced compaction, species diversity) as tools to reduce the risk of tree mortality and economic loss during FTC outbreaks.
Regional extension specialists presenting at a Maine Forest Service workshop advised sugarbush operators and educators to prioritize monitoring and adaptive management to reduce the long‑term impacts of forest tent caterpillar outbreaks.
Jason Lilly of Cooperative Extension explained how defoliation reduces carbohydrate storage and may depress radial growth for one to three years after an outbreak; trees that are multiply stressed (poor soils, drought, recent harvests or root damage) are at higher risk of mortality when defoliated repeatedly. He recommended site‑level resilience strategies: liming to improve soil base cations where appropriate, minimizing soil compaction and root shear (adjust road access timing), managing stocking density (roughly 80–100 tappable trees per acre suggested as a practical target), and encouraging species diversity to disrupt FTC movement.
Kyle Lombard (New Hampshire) and Vermont presenters detailed monitoring diagnostics. Root‑starch testing (iodine staining of fine root chips, matched to color charts) can indicate depleted carbohydrate reserves and help guide decisions such as reducing tapping or delaying harvest. Egg‑mass surveys — inspecting branch tips and counting new, spumalene‑encased egg masses at standardized plots — provide the best on‑the‑ground prediction of next season’s defoliation risk. Presenters advised sampling after leaf‑off and, for starch tests, collecting samples in November–December and freezing them promptly for lab analysis.
Panelists emphasized that reducing tapping depth or temporarily reducing taps per tree can help conserve carbohydrates, though speakers said long‑term data linking tapping reduction to reduced mortality during FTC outbreaks remain limited and recommended consultation with local specialists and research centers (Procter Maple Research Center and state extension labs).
Practical supports: some states offered egg‑mass counts and starch testing services for landowners during outbreaks; extension staff said they would provide printed protocols, data sheets and field equipment at the Big 6 workshop field demo.
