![]() To bypass the problem of soil alkalinity, iron or manganese can be applied directly to the plant. These materials are relatively slow acting, and the soil will have a tendency to return to alkaline, so it can be a never-ending battle. The amount needed depends on the size of the area, the current soil pH and soil type. Larger areas are more feasibly treated with elemental sulfur, iron sulfate or aluminum sulfate to the soil. Small areas can be made more acidic by applying acidic organic matter, such as peat moss, to the soil. For a long-lasting solution, make the soil more acidic to free up the existing nutrients. Iron and manganese chlorosis can be corrected in several ways. ![]() However, if manganese-deficient leaves are treated with iron, they become even more chlorotic. Silver and red maples are especially sensitive to manganese deficiency. Manganese deficiency symptoms are similar to those of iron. In extreme cases, the tissue may turn brown and plants may be stunted. This striking contrast becomes apparent on the youngest foliage first. Iron deficiency causes interveinal chlorosis - a yellowing of the tissue between the veins while the veins remain green. As soil pH becomes more alkaline, iron and manganese are chemically tied to the soil, making them unavailable for plant uptake. Iron and manganese deficiencies usually are not caused by an actual lack of these nutrients in the soil, but by soil that is too alkaline. Both are considered to be plant micronutrients, meaning they are needed in small quantities by plants. The major cause of chlorosis in landscape plants is a deficiency of either iron or manganese. When chlorophyll is not present, the resulting color is usually yellow. Other landscape plants are also susceptible to chlorosis, including rhododendrons, river birch, holly and sweet gum.Ĭhlorosis gets its name from the lack of chlorophyll, the pigment responsible for healthy plants’ green color. Unfortunately, most pin oaks planted in the Midwest are plagued by a yellowing of the leaves known as chlorosis. Their pyramidal form, pendulous lower branches and reddish or bronze fall color are striking. Pin oak trees can be a beautiful asset to the landscape. and tagged fall, marcescent leaves, pin oak, tree by Allison.
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