Apple scab is one of the most common and most serious diseases that afflict apple trees. Apple tree pests, diseases and problems Rejuvenating old trees. 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. 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. A pest is different to a disease!Apple tree pests are living insects, whereas disease of apple trees are normally fungus types. This bulletin describes the most common insect pests and diseases on fruit trees in home gardens. Prune trees to encourage an open-centred vase shape – this allows for better air and light circulation. Thin fruit out in late spring/ early summer. A dwarf tree on dwarf rootstock will fruit within 2 years. Below are a few of the most common apple diseases: Apple Scab. Apple maggot flies – Apple maggot flies lay eggs in developing fruit in June or July. Picking up fallen fruit is critical to help prevent pests and diseases. 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. To control summer diseases, spray the fungicide in early June and then again every 14 days through the middle of August. As it grows, an apple tree may experience issues such as the presence of pests or diseases. Apple trees (Malus spp.) 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. and other plants in the rose family, like hawthorns (Crataegus spp. ), 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. Sticky traps can be hung in the tree near fruit about three weeks after petals fall; two traps for trees less than 8 feet (2 m.) tall, and six traps for those 10-25 ( … Monitoring apples trees for signs of pests and disease and following good cultural practices can alleviate many problems. native to Western Australia) can occur. Home »; Apple tree pests, diseases and problems. Several diseases and pests affect apple trees, leading to the production of small, distorted or damaged fruit. Pest & Disease Control for Apple Trees. Scab is the most serious disease of apples and pears in New South Wales. In some instances, application of chemical treatments may … 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. It is the perfect time to start thinning fruit clusters and to begin controlling one of the most serious of all apple tree pests. Apples will be pollinated by nearby apple and crabapple trees. Pests and Disease. 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. Fruit develops on branches that are two-year-old or older, so take when pruning, otherwise you may affect your next harvest. Once the eggs hatch, the larvae burrow into the apples. 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. Although it is costly to control, neglecting or wrongly applying control measures may reduce fruit yield and quality. Fortunately, home growers can avoid most diseases by planting disease resistant varieties. They can take 3-4 years to fruit. Support the tree with a stake or frame. 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