in horticulture and is the director of Bringing People and Plants Together, an organization dedicated to bringing horticulture education and therapy to the community. For more pictures showing the different stages of iron chlorosis in a maple tree, check out our Facebook page. We thinned, pruned and treated for several years. All of the leaves had turned as yellow as sunflowers. That was the case for our severely-chlorotic maple tree. You can find one at: /findanarborist/arboristsearch.aspx. Trunk injections can also be done, but are best performed by a certified arborist.
You could also try an iron chelate foliar spray with EDTA, another chelation enhancer, but with large trees you can expect spotty results and the benefits are often temporary. USU also suggests an iron chelate with EDDHA, an iron-chelating chemical, is effective in our high pH soils however the benefits only last one year and it is expensive. This disease usually occurs during late summer or early fall, especially if there has been a period of drought. The branches will weaken and the trees’ lives are threatened. The infected leaves eventually become brown and drop off. Their website states a combination of ferrous sulfate and elemental sulfur can have lasting results and is inexpensive to apply. Maple tree leaves turn yellow when suffering bacterial leaf scorch, which is caused by a bacterium. This disorder is caused by the trees inability to absorb the available iron in our soils due to high clay and high alkalinity. The most common maple tree with yellow leaves is the Norway maple (Acer platanoides). Since we’re not having a class on plant physiology or chemistry today, let’s just say it’s like bobbing for apples with no teeth. If your maple tree has yellowing leaves with green veins, iron chlorosis may be the problem. There are numerous chemical reactions and interactions that come into play with iron chlorosis. The most common leaf colors of fall are red, yellow, and orange. Here in Colorado, we typically have plenty of iron in our soil, so what’s the problem? It is the plant’s ability to uptake the iron. In some cases, a tree's common name is derived from its primary autumn leaf color, such as red maple and yellow poplar. Iron chlorosis will cause the leaves to turn from dark green to light green to yellow, but the veins on the leaves will remain green. There are a number of reasons tree leaves will yellow, including poor drainage, damaged or compacted roots, high alkalinity, and nutrient deficiencies.Īccording to the University of Illinois Extension, a lack of iron either in the soil or available for uptake by the plant, is one of the more common reasons for chlorosis. Are your maple trees trying to tell you something? Are they yellow and look as though autumn has arrived early? As I drive around my neighborhood, I can’t help but notice the vast number of yellowing maple trees.Ī friend of mine, who also volunteers for our organization, was asking about this common problem, so I decided it was time to write an article about this challenging issue.Ĭhlorosis is a term for leaves turning yellow due to a lack of chlorophyll.
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