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Guttation
Tom Zabadal , MSU Horticulture
Home > Scouting guide> guttation
This physiological vine condition may occur on spring mornings when grapevine shoots are young. If vineyard soils are saturated with water and high humidity and calm weather minimize evaporation from leaf surfaces, a positive pressure of sap in vines can cause water droplets to form on the tips of serrations on the edge of the leaf. When that water evaporates, it may leave salt deposits on the leaf margins. Guttation is not harmful to the vine.
GuttationPhoto: Annemiek Schilder Guttation
Salt accumulation from guttation on the margin of a DeChaunac grape leaf in early June. Photo: Tom Zabadal

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Funding for this web site provided by Project GREEEN, American Farmland Trust, EPA Region 5's Strategic Agricultural Initiative program, The National Foundation for IPM Education, the Center for Agricultural Partnerships and the MSU Integrated Pest Management Program
in collaboration with MSU Extension and the Michigan Agricultural Experiment Station.
Updated 12/20/07 Contact: J.N. Landis.