UVM Proctor Page


Using Smartrek vacuum monitoring system

By Timothy D. Perkins and Mark L. Isselhardt |

Four main factors influence sap yields from maple trees. First there is the tree resource itself. Secondly, weather conditions suitable for stimulating sap flow (freeze-thaw events) must occur to start the process. Thirdly, excellent spout and tubing sanitation practices. Finally, higher vacuum levels. MORE ]


Should droplines be replaced when using check valve adapters or spouts?

Timothy D. Perkins |

The Leader Check Valve Adapter (CVA) and Leader Clear Check Valve Spout (CVS) are designed to reduce the amount of sap backflow (sap movement back towards the taphole during pump shutdown, leaks, or releaser dumps). MORE ]


The ‘Jones Rule of 86’ revisited

Timothy Perkins and Mark Isselhardt |

The Jones “Rule of 86” was devised in 1946 by C.H. Jones, a scientist and educator at the University of Vermont.

Originally it was incorporated into a poem that taught several best management practices in a humorous way (see “The maple rule of eighty-six”, reprinted on pages 18-19 of the December 1967 edition of the “National Maple Digest” and pages 129-132 of Maple Sugarin’ in Vermont, by Betty Ann Lockard 2008). MORE ]


Proctor comes out with long awaited new tapping guidelines

By Abby van den Berg, Timothy Perkins, Timothy Wilmot, and Mark Isselhardt |

Each year, tapping for sap collection permanently removes a small portion of wood where the spout is inserted. The tree’s response to the wound also results in a column of wood extending above and below the taphole that remains permanently nonfunctional for water transport and future sap collection. Sap collection also removes a portion of the tree’s carbohydrate (sugar) reserves, which are important for supporting the tree’s growth and health. MORE ]


Gravity Tubing Experiments — April 2013

Tim Wilmot |

Year 4 of gravity tubing experiments in Underhill, Vermont. This line of 3/16 tubing has 37 taps. MORE ]


Exciting new spout research at Proctor continues this season

Timothy Perkins |

Researchers at the UVM Proctor Maple Research Center are working on a prototype spout and stubby combination designed to separate the sap from the gases released by the tree in order to maintain a high level of vacuum at the taphole. MORE ]


3 years of research looks at gravity tubing

Tim Wilmot, University of Vermont |

Many maple producers consider gravity tubing, or tubing without the use of a pump, to be a poor substitute for a modern system with a pump, extractor, and the latest tubing arrangement. MORE ]


Grant awarded to examine tapping practices

Paul Post |

To Tim Perkins, maple tapping is kind of like taking out a loan.

You can opt for high yield now on smaller trees and wind up paying high “interest rates” or adopt more sustainable practices with a tree’s long-term health in mind that will keep it productive and profitable for decades to come. MORE ]