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Forest, Parks & Recreation - Vermont

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Forest Tent Caterpillars Still on the Rise


Forest Tent Caterpillar populations increased again in 2006, with 343,000 acres of defoliation mapped by aerial survey. The damage generally increased from 2005 in southern Vermont and in the central Green Mountains, and decreased in the Champlain Valley.

Large numbers of caterpillars died from disease. Many others died in cocoons thanks to parasites, such as the native “friendly flies” that were so common in early summer. Still, the outbreak may continue in 2007. Forest tent caterpillar moth counts are about the same as they were in 2005.

For more information on forest tent caterpillar, or to see photos of these insects, visit:

For more information on forest tent caterpillar in Vermont the and the 2006 Vermont Forest Tent Caterpillar Spray Project visit the VT Forests, Parks & Recreation's Forest Tent Caterpillar Web Page:

FPR Forest Tent Caterpillar Page


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VT Forestry Division Provides Management Recommendations for Sugarbushes Defoliated by Forest Tent Caterpiller

Forest Tent Caterpillar populations increased in 2006, with 343,000 acres of defoliation mapped by aerial survey. The damage generally increased from 2005 in southern Vermont and in the central Green Mountains, and decreased in the Champlain Valley.

Although healthy maples can withstand several years of defoliation, some are declining in sugarbushes which have been defoliated two or hree times. Dead trees are showing up in recently thinned sugarbushes, or on ridges, dry slopes or wet areas. Some unthinned trees on good sites have also died. Fortunately, the outbreak has coincided with ample rain…so far.

In selecting a sugarbush management strategy, consider both current tree condition and your ability to tolerate unpredictable future stresses (like drought) which could set decline in motion.

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Vermont Leads Nation in 2006 Maple Production

USDA NASS- Vermont led all states in production with 460,000 gallons, an increase of 12 percent from 2005. Maine’s production, at 300,000 gallons, increased 13 percent from last season. Production in New York, at 253,000 gallons, is 14 percent above 2005. Production doubled in Wisconsin, and is up 34 percent in Michigan, 13 percent in Ohio, 12 percent in New Hampshire, and eight percent in Pennsylvania. Production remained the same in Connecticut and Massachusetts. Large increases in yield as well as additional taps set in many States led to this year’s increased production.

Temperatures in the maple producing states varied across the country. While producers in Maine, Michigan, Ohio, Vermont, and Wisconsin reported favorable conditions, producers in the other five States experienced weather that was either too warm or too cold for favorable sap flow. On average, the season lasted approximately 28 days compared to 24 days in 2005. Michigan and Pennsylvania had the earliest season opening date of January 1. Michigan also had the latest sap flow in 2006 with an approximate season ending date of May 2.

Sugar content of the sap for 2006 is down from last year. On average, approximately 43 gallons of sap were required to produce one gallon of syrup. This compares to with 40 gallons in 2005 and 42 gallons in 2004. The majority of the syrup produced this year is of medium color. The 2005 U.S. average price per gallon is $29.90, up $1.50 from the 2004 price of $28.40. The U.S. value of production, at $37.1 million for 2005, is down 13 percent from 2004.

For the complete 2006 Maple Syrup Report:

Maple Syrup 2006; New England Agricultural Statistics


A Popular State Tree; The Sugar Maple…

Photo of a large maple.

Vermont shares its state tree with three other states: New York, Wisconsin, and West Virginia. The Vermont Legislature adopted its State Tree in 1948. The sugar maple is particularly significant to Vermont, as the Green Mountain State leads the nation in production of maple syrup, and because there are probably more individual sugar maples than any other tree species growing in Vermont…

To Maple Field Guide: Sugar Maple Page

More Maple Trivia… to Maple Trivia Page

About This Site
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About This Site… is designed to be a clearinghouse for information on maple as a genus. Our objective is to provide information on the various species, their uses, value, health and management; appropriate to students, teachers, landowners, foresters and the general public. The site makes use of a combination of links to existing web resources and on-line documents, as well as original articles to tell the "maple story".

This web site is a project of the Vermont Department of Forests, Park & Recreation, and is funded, in part, through a grant from the USDA Forest Service, Rural Development Through Forestry Program.

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