Sap Flow, Wounding, & Compartmentalization in Maple
How does a tree respond to the wound created by a taphole, and what does that mean for future sap production?
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Sap Prices
Table presenting suggested prices per gallon for a maple producer to purchase sap.
Sap sugar within, between seasons at UVM PMRC
Changes in the amount of sugar in maple sap vary within a sap run, from day to day, throughout the season, and from year to year.
Sap Value Calculator
Use this online calculator to determine the proper price to pay for sap.
Sap Yields and Tapping Stained Wood
The effects of tapping on trees, and how to avoid overtapping.
Sap Yields from Fall and Spring Tapping of Sugar Maple
Some maple sap producers have wondered whether they could increase the total sap yields by tapping their trees not only in the sprint but also in the fall too. Our research indicates that tapping in the fall cannot be recommended.
Sap-Sugar Content of Forest Service Grafted Sugar Maple Trees
In March and April 1983, 289 and 196 young grafted sugar maple trees were tapped and evaluated for sap-sugar content. In April, sap was collected from taps both above and below the graft union. Diameter of all tapped trees at 18 inches above the ground was measured. Analysis of the data revealed that: (1) trees selected for high sugar yield cannot be reproduced by grafting on rootstock of unknown but varying sugar content without encountering large fluctuations in sap sweetness of the trees produced; (2) diameter is not correlated with sap sweetness of young grafted trees; (3) numerous sap-sugar readings over time may be necessary to identify the sap sugar characteristics of a candidate sweet tree; and (4) the cause of the variation in sap-sugar content of trees over time needs to be investigated more fully.
SapSpy keeps tabs on the sugarbush
During the 2021 season, the UVM Proctor Center tested SapSpy (www.sapspy.com), a relatively new entrant in the sugarbush monitoring field.
Should droplines be replaced when using check valve adapters or spouts?
Since check valve adaptors and spouts reduce sap backflow, this research studied whether or not dropline replacement is as important to improving sap yield when using these taps.
Should Lateral Lines Be Vented?
A great deal has changed since the 1960s and 1970s in terms of maple production and recommended practices, especially given the introduction of the new polyethylene tubing formulations and new types of spouts. Consequently, we are occasionally asked whether lateral lines in gravity tubing installations should be vented. As a result of these questions, we compared sap yield from standard non vented (closed) 5/16″ lateral lines alongside a vented 5/16″ installation under gravity conditions.