Several diseases and pests affect apple trees, leading to the production of small, distorted or damaged fruit. and other plants in the rose family, like hawthorns (Crataegus spp. Support the tree with a stake or frame. This bulletin describes the most common insect pests and diseases on fruit trees in home gardens. Apple trees (Malus spp.) Prune trees to encourage an open-centred vase shape – this allows for better air and light circulation. Home »; Apple tree pests, diseases and problems. To control summer diseases, spray the fungicide in early June and then again every 14 days through the middle of August. Fruit develops on branches that are two-year-old or older, so take when pruning, otherwise you may affect your next harvest. Apples will be pollinated by nearby apple and crabapple trees. They can take 3-4 years to fruit. Picking up fallen fruit is critical to help prevent pests and diseases. In some instances, application of chemical treatments may … At some time or other many of us inherit very old, gnarled, unproductive apple trees that simply don’t yield very well any more and may appear as if they are on their last legs. It is the perfect time to start thinning fruit clusters and to begin controlling one of the most serious of all apple tree pests. A dwarf tree on dwarf rootstock will fruit within 2 years. As it grows, an apple tree may experience issues such as the presence of pests or diseases. ), are susceptible to many diseases.The good news is that these diseases are often preventable and, even when they aren't, often cause damage mainly on an aesthetic level. native to Western Australia) can occur. Monitoring apples trees for signs of pests and disease and following good cultural practices can alleviate many problems. Apple maggot flies – Apple maggot flies lay eggs in developing fruit in June or July. Factors such as location, weather, and upkeep play a part in which issues your apple tree encounters and how well it stands up against them. Once the eggs hatch, the larvae burrow into the apples. Although it is costly to control, neglecting or wrongly applying control measures may reduce fruit yield and quality. Thin fruit out in late spring/ early summer. Apple scab is one of the most common and most serious diseases that afflict apple trees. Scab is the most serious disease of apples and pears in New South Wales. It usually appears in early to mid-spring and is more prevalent during rainy weather. Apples are not fuss-free plants and growing them will test your patience. Pest & Disease Control for Apple Trees. At one time - in the UK - it was possible to use a winter tar wash on trees, and this killed the overwintering apple tree pests for the following growing season. Below are a few of the most common apple diseases: Apple Scab. pest and diseases affecting apple tree branches and trunk BARK CRACKED, PATCHES OF BARK SUNKEN DOWN 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. To control the many other insects that attack apple trees, use an insecticide when the blossoms start to drop and then three more times, at two-week intervals. Apple tree pests, diseases and problems Rejuvenating old trees. A pest is different to a disease!Apple tree pests are living insects, whereas disease of apple trees are normally fungus types. These exotic pests are a concern for the farming community, as they could threaten the agricultural and horticultural industries and increase the price of production and the cost to the consumer. Pests and Disease. 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