Above normal tissue analyses and weak vine growth. If the vines are weak, discolored, or stunted, and the tissue analyses are above normal, look for stress from pests, drainage, drought, frost, or other factors limiting growth. Above normal tissue analyses and vine growth. If your tissue analyses are above normal and vine growth is adequate or above normal, reduce the amount of fertilizer you have been applying. Tissue analysis results outside the normal range cannot always be attributed to your fertilizer program.
Several fungicides contain plant nutrients.
Zn also may occur if liquid fertilizer was used. High levels of manganese are common in cranberry tissue. If Mn-containing fungicides have not been used and the tissue concentration of Mn exceeds 300 ppm, soil drainage may be inadequate. In this case, check the drainage conditions of your bed. For more information Chaplin, M.H., and L.W. Martin.