Home About Us Search Newsletters Weather / Climate Viticulture Pest management Scouting guide Publications Calendar of events Industry links Contacts Download Adobe Acrobat Reader to view pdf files.	Sour soil (Säureschäden) Tom Zabadal , MSU Horticulture Home > Scouting guide> sour soil When varieties of Vitis vinifera L. are grown on highly acidic soils (pH of 4.5 or less), the margins of basal leaves may become yellow and then speckled with brown areas. The low soil pH level associated with these symptoms results in low levels of calcium, magnesium and phosphorus in vines and high levels of potassium, aluminum and manganese. This condition may cause poor fruit and shoot maturity. Säureschäden on the basal leaves of White Riesling vines. Photo: T. 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. Partially support from NC-IPM Center. 05/26/11 Contact: E. Haney