![]() ![]() Unless treatment is done in the spring, results may not appear until next year as the iron is absorbed. There are do-it-yourself kits on the market that are applied by drilling holes into the trunk and releasing a cartridge filled with an iron solution into the water transport system. Trunk injection is often the preferred method of treatment if done correctly.This treatment may last two to three years before reapplication is needed. The treatment amount is equal parts of sulfur and iron sulfate at the rate of one pound each for trees under 4 inches in diameter, and two pounds for trees over 4 inches in diameter. Make additional circular patterns around the tree until the mixture is applied. Space the holes two feet deep and about fifteen feet apart beginning three feet from the trunk. This granular mixture should be placed in holes drilled around under the canopy of the tree. Soil treatments with a mixture of equal parts sulfur and iron sulfate are another method of treatment.Thus it is not highly recommended for a tree with a chronic chlorosis problem. This will give a quick green up of the leaves but will not last. A foliar application of iron sulfate or iron chelate solution may be applied when the tree is fully leafed out.Young trees affected by the problem should be removed and replaced. It will take a lifetime of treatments as there is no one-time fix to the high pH soils that create the problem. There are several methods to help a plant affected by iron chlorosis overcome this problem. Iron found naturally in the soil changes from a soluble form to an insoluble form that many plants have difficulty drawing out. ![]() ![]() The problem arises when the soil pH rises above 7.0. Soils in Kansas usually have adequate amounts of mineral iron. Symptoms may appear over the entire tree, on one side, or be limited to a branch or two. Chlorosis is mostly likely to be seen in: Not all plants are susceptible to iron chlorosis. If left untreated, twigs or even the tree can die. In severe cases, leaf color changes from yellow to white to brown. The lack of iron results in the loss of the green color. Iron is necessary for the production of chlorophyll. Chlorosis is caused by the plant not being able to acquire the iron it needs. Iron chlorosis affects many trees, as the leaves turn a yellowish color while the leaf veins remain dark green. ![]()
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