There are several causes of yellow spots on apple tree leaves. One of the common reasons is that a fungus has invaded the open wounds and caused an infection. One way to know if the spot has been caused by fungal growth is by examining the surrounding foliage closely. If you see yellow spots, the best thing to do is to remove the infected part of the leaf and cure the spot with fungicide. However, if you find that a small yellow spots on apple tree leaves is simply caused by water damage or insect infestation, try one of the following home remedies:
A fungal infection of the tree can spread to nearby trees through replanting, especially when there are other trees nearby. A few steps should be taken to make sure the fungal growth does not spread to other plants nearby. When you are planning to replant, make sure that all branches are fully grown, mature and free from insects before you move them. You should also check the soil for damage from insects and tree diseases.
Another cause of yellow spots is tree disease. The most common is tree fungal infection, which is usually identified by a yellow discoloration of the foliage. This condition is identified as being mild in severity and responds well to fungicide treatment. Tree diseases are usually caused by fungi called xylex (ringworm) or dermatophytes (yeasts). Some commonly found fungi include: needle castor, ringworm of the lower limb, candida, and tinea.
The other main cause of yellow spots on the foliage is insects. These include ladybirds, flies, mosquitoes, and chiggers. Ladybirds and flies are particularly active at night and during periods of low humidity. They will deposit their eggs in the foliage where they can later hatch and infest it.
Moles and chiggers will also deposit their eggs under the bark where they can later hatch and cause yellow spots. A few pests that are common on apple trees are white grubs and rock grubs. Although these grubs may look like tiny brown or black dots, their color actually varies depending on the grub’s environment, thus, their spots can vary from dark yellow to light yellow. Another pest that causes spots is leafhopper larvae, which eats leaves and eventually causes yellow spots on apple leaves.
If you find yellow spots on apple trees, do not panic. The spots are normal, especially on trees that are newly established. The spots will eventually fade to yellow brown with little development time. In some cases, a tree may appear blotchy even when there are no yellow spots present.
A good thing to remember is that yellow leaves often signal sickness in other parts of the tree. Therefore, you should not panic if you see yellow patches on your tree’s leaves. Instead, act as a health precautionary measure and take precautionary measures such as washing the tree’s leaves with soap and water regularly. This will prevent the presence of harmful pathogens that can spread through the leaves into the tree’s trunk and other parts of the tree.
If yellow spots are a usual occurrence on your apple tree’s leaves, do not worry too much. Some diseases are normal and they will eventually fade away. However, if yellow spots are new and are appearing very frequently, it is best to contact your local extension office or doctor for a diagnosis. The best way to deal with yellow spots is to keep your tree free of pests, which can be done by regular pest control treatments and by making sure that the tree is planted in the correct conditions such as soil and shade.