Bark cracked patches of bark sunken down. Apple scab is one of the most common and most serious diseases that afflict apple trees.
Apple scab is a fungal apple tree disease and normally appears in the later part of autumn or early in spring.
Apple tree diseases uk. Powdery mildew on apples will look like a velvety covering on leaves and branches. Why have the leaves on one branch of my tree turned a silvery colour. Note the scab also affects pyracantha but it is a slightly different strain and apple trees with scab do not infect pyracantha or the other way around.
The most likely cause is a disease called silver leaf which can also cause branch dieback. It can affect. This disease is a major problem for commercial growers of tree fruit as well as the amateur gardener.
It usually appears in early to mid spring and is more prevalent during rainy weather. The image shows an early attack which can develop into large lumpy growths affecting the tree quite severely unless treated. The fungus spores are released in the spring during wet weather and are blown by the wind onto vulnerable newly emerging leaves.
The disease is caused by the fungus venturia inqequalis which overwinters in infected leaves left on the ground. Pest and diseases affecting apple tree branches and trunk. Canker is a fungal infection which enters tree wood at the site of existing damage normally caused by bad pruning techniques although damage by woolly aphid see above can also allow the fungus to enter the tree.
Apple scab apple scab is an apple tree disease that leaves warty brown bumps on the leaves and fruit. It shows as brown or black. Apple tree pests and bugs.
Powdery mildew while powdery mildew affects a great many plants and on apple trees it can decrease the number of flowers and fruit and cause stunted growth and blemished fruit. Maggoty apples usually the earlier varieties are usually identified as coddling moth. The small adult moths lay there eggs on developing fruit in may and june and the tiny larvae burrow into the developing fruitlets and feed inside.
It is a fungus that primarily affects trees in areas that have high humidity. The most common disease affecting apple trees is some form of canker or other. This disease can also attack the fruit see below.
Your tree is affected by the disease apple scab. Common diseases of apple trees. The leaves on the young shoots of my apple tree are curled and sticky.