It usually appears in early to mid-spring and is more prevalent during rainy weather. Apple tree pests, diseases and problems Rejuvenating old trees. In some instances, application of chemical treatments may … Home »; Apple tree pests, diseases and problems. Picking up fallen fruit is critical to help prevent pests and diseases. It is the perfect time to start thinning fruit clusters and to begin controlling one of the most serious of all apple tree pests. 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. Apple trees (Malus spp.) 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. Monitoring apples trees for signs of pests and disease and following good cultural practices can alleviate many problems. Several diseases and pests affect apple trees, leading to the production of small, distorted or damaged fruit. Pests and Disease. Fortunately, home growers can avoid most diseases by planting disease resistant varieties. Thin fruit out in late spring/ early summer. Although it is costly to control, neglecting or wrongly applying control measures may reduce fruit yield and quality. This bulletin describes the most common insect pests and diseases on fruit trees in home gardens. Scab is the most serious disease of apples and pears in New South Wales. native to Western Australia) can occur. ), 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. Fruit develops on branches that are two-year-old or older, so take when pruning, otherwise you may affect your next harvest. 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. Prune trees to encourage an open-centred vase shape – this allows for better air and light circulation. 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. 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. Apple maggot flies – Apple maggot flies lay eggs in developing fruit in June or July. Apples will be pollinated by nearby apple and crabapple trees. Apple scab is one of the most common and most serious diseases that afflict apple trees. A dwarf tree on dwarf rootstock will fruit within 2 years. Support the tree with a stake or frame. Apples are not fuss-free plants and growing them will test your patience. To control summer diseases, spray the fungicide in early June and then again every 14 days through the middle of August. Once the eggs hatch, the larvae burrow into the apples. 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 ( … They can take 3-4 years to fruit. Below are a few of the most common apple diseases: Apple Scab. A pest is different to a disease!Apple tree pests are living insects, whereas disease of apple trees are normally fungus types. 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. Pest & Disease Control for Apple Trees. 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