![]() Rainy spring weather tends to perpetuate this disease where hot dry periods can halt the disease. The easiest method of control is to keep dead twigs and leaves raked up from under your trees. ![]() This disease remains active on the leaves and twigs that have fallen to the ground and eventually spores are released that can re-attach themselves to the tree or new leaves. This fungal disease is prevalent during rainy seasons and conditions of high humidity. Affected trees will often have spots or scorch like spots on the leaves. AnthracnoseĪnthracnose is a fungal type disease that attacks a wide variety of tree and shrub species. But what’s really important to note is that even though these two trees lost large branches that had to be cut out, leaving a large hole in the tree, within a couple of years the trees filled back in and are once again nicely shaped and beautiful. Twice I’ve had fairly large branches on my Acer palmatum dissectum maples die back all the way to the trunk of the tree and I have to assume it was caused by Verticillium Wilt. There’s really nothing you can do to treat your Japanese maples to prevent this disease and there’s nothing you can apply once they have it. Verticillium Wilt is caused by a soil borne fungi but usually attacks plants that have been stressed by other things. Special: A Quick and Easy Way to Make Money at Home Growing Plants If the tissue is brown and mushy that part of the plant is dead. If the tissue below the bark is green and firm your plants are fine. Just scratch the bark of the plant with your finger nail. How do you know for sure the branch is dead? This is how you test to see if a plant, or a branch on a plant has died. In many cases the branch dies completely and should be completely removed from the tree at first sign of the disease. This often happens in late summer or early fall. In some cases the leaves on a single branch will discolor and die, but do not fall from the tree. Verticillium Wilt is a disease that can attack Japanese maples. As a collector of Japanese maples for many years I’ve seen little to no evidence of this on any of my plants. This pathogen can cause die back of small branches. Japanese maple leaves can be spotted and the veins within the leaves can be blackened. This bacteria is considered opportunistic because it usually attacks plants that have already been damaged by frost or by other means. Pseudomonas syringae is a common bacteria that affects many woody plants, including Japanese Maples. Insects and Diseases that can Attack Japanese Maples After planting, if you really feel that you need to fertilize use something organic. Better to plant them in good rich soil that has a great deal of organic matter, such as composted cow manure worked into the soil before planting. They don’t like to over eat! Japanese Maples Do Not Like a Lot of Fertilizer! In other words, it’s best not to fertilize them at all. New: Video Reveals a Simple Way to Root Plants from Cuttings (Watch Now!)ģ. But given a choice water the roots and not the tops. This isn’t a serious problem and not one that I worry a lot about. The water droplets act as mini magnifying glasses and can leave burnt spots on the leaves. They don’t like wet hair! Japanese maples don’t like to have their leaves sprayed with water when the sun is out. When planted high like this your tree will need watered about twice a week, but check the soil near the roots and make sure it’s not soggy before you add more water.Ģ. That’s why I suggest planting only half the root ball in the ground, then building a raised bed around the part that is sticking out of the ground. Make sure you do not dig a hole that will become a bathtub that your plant can drown in. Keep in mind that the root ball is made up of very loose, porous soil that water can easily drain into. Then set the tree in the hole and fill around and over the root ball with good, rich topsoil. In heavy clay soil you should only dig the hole half as deep as the root ball on your tree. Many people do it wrong and their tree dies. If you have heavy clay soil that does not drain well you have to make some adjustments to how your tree is planted, but be careful not to make the wrong adjustments. They don’t like wet feet! In other words only plant them in good rich soil that drains well. But there are a few things you should know about them.ġ. For the most part they are usually care free plants that happily exist in just about any landscape. Contrary to what most people think, Japanese maples are pretty easy to raise and care for. ![]() In most cases that’s not the case at all. Japanese Maple Failure not Caused by DiseaseĪs soon as somebody has a Japanese maple, or any plant for that matter, that doesn’t look good they immediately think it’s being attacked by some dreaded disease.
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