The disease attacks all the aerial parts of the trees, being favored by the cold and wet weather. I'm not sure what the problem with your tree is, but I would look at the roots because the tree doesn't seem to be getting needed moisture from the roots. This species develops colonies on the lower side of the leaves. Also the disease is transmitted by some species of cicadas. All varieties of apple trees require full sun to produce a high-quality fruit. The most frequent form of attack it manifests on the leaves through the appearance of some irregular yellow spots. If the attack is strong, the photosynthesis capacity is reduced and the yield too. As a rule of thumb, leave the water running for 10 minutes per inch of penetration. Honeycrisp will not come true when grown from seed. "Honeycrisp" apples were first developed in 1960 by breeding a cross of "Macoun" and "Honeygold" apples. The terminal buds enter in rest, and the axial buds develop strongly. This fruit tree has a small trunk and a broadly branched crown. So, the fruits deforms, lose their taste, and on those wounds can install different pathogens. Apple trees need at least 8 hours of sun per day during the growing season. It has 3-4 generations a year and winters in the superficial layer of the soil. The spots unify and destroy the whole leaves. The wounds are gates for the funguses from the Monilinia genus. Considered the king of the fruits, the apple has in his composition a series of elements indispensable to the human body: iron, phosphorus, calcium, cellulose, carbohydrates, magnesium, vitamins (A, B1, B2, C). It has a generation a year and winter as an adult in protected areas (bark of the trees). If the temperatures are between 18 and 20 degrees Celsius the spots brunify. When watering an apple tree, it's important to saturate the roots. On the fruit appears some black spots, from which leeks the bacterial exudate. "Honeycrisp" apples were first developed in 1960 by breeding a cross of "Macoun" and "Honeygold" apples. It has 8-12 generations a year and winters as a larvae in the bark of the trees. Most apple trees, including the "Honeycrisp," thrive in soil that's made up of a combination of sand and clay. There are various reasons (diseases, pests, high or low temperatures). Cutting and destroying of the affected branches (sprouts); Treatments with Decis Mega EW 50, Karate Zeon 50 CS, Affirm, Mospilan 20 SG, Laser 240 SC. The females lays its eggs in the flowers or in the blossoms. Standard trees take 300–400 square feet or more and may be over 30 feet tall. The appearance of this disease is favored by the temperatures between 22 and 30 degrees Celsius and atmospheric humidity of 80%. Tumefaciens. Begin by inspecting the branches all over the tree. Smaller sized (dwarf) apple trees require the least amount of space. Treatments with Mospilan 20 SG, Faster 10 CE, Confidor Energy, Actara 25 WG, Actellic 50 EC. The attack on the flowers is similar with that from the leaves. In the spring, they leave their shelter and attacks the buds. They feed with the cell juice. Treatments with Decis Mega, Reldan, Fastac, Actara 25 WG, Calypso 480 SC. The leaf symptoms occur early in the growing season and often worsen as the shoots grow. The bark on the affected branches is cracked, and the wounds are having a light color. This penetrate into the fruit through the peduncle area and eat irregular galleries around the stone. The tumors are having different sizes and forms. Have you applied any treatment so far? The appearance of this disease is favored by high atmospheric humidity, wind, rain and temperatures between 10 and 30 degrees Celsius. It is a polyphagous species that attacks ornamental trees (Mulberry tree, London plane etc.) The spots will grow, and will cover with a velvety mycelium. Verification of the seedlings before planting; Disinfection of the tools with alcohol or chlorine; The big wounds, resulted after the maintenance works will cover with resin mastic; Treatments with Merpan 50 WP, Captan 80 WDG, Topsin 500 SC, Champ 77 WG, Copernico Hi-Bio. In the young sprouts, the larvae eat holes to penetrate. It has a generation a year and winters as a larvae in the soil. Your email address will not be published. One to consider for low lying ground. Cutting and destroying of the attacked fruits and sprouts; Treatments with Mospilan 20 SG, Affirm, Decis Mega EW 50, Calypso 480 SC, Coragen 20 SC. Whatever the cause, they are commonly seen on this cultivar and do not appear to affect growth or yield. The caterpillars will stay on the lower side of the leaves and and will start to consume them. There isn’t a treatment for this disease. On the roots and on the stem develop tumors, at the start small and soft, and after a while becomes like a wood. The larvae of the next generations penetrate in the fruits that will ripen, where it diggs deep galleries. The virus is transmitted through grafting, pollen, infected seeds, and in the nursery by the touching of the roots. Watering in the morning or late afternoon will help reduce evaporation and use less water. The female lays its eggs on the fruits, in the area of the calyx. Treatments with Movento 100 SC, Calypso 480 SC, Faster 10 CE, Nurelle D, Affirm. The virus is transmitted through grafting and through the contact of the roots. Inside those leaves you can find yellow-orange vermiform larvae. Cutting and burning the affected branches; Treatments, after each rain with Dithane M 45, Aliette WG 80, Champ 77 WG, Melody Compact 49 WG, Funguran OH 50 WP. It is a very dangerous disease, that can destroy the whole orchard. University of Minnesota Extension: "Honeycrisp" Apple, Ohio State University Extension: Growing Apples in the Home Orchard, University of New Hampshire Cooperative Extension: Care of Mature Backyard Apple Trees, Tips for Planting Granny Smith Apple Trees, Watering and Care for a Dwarf Gala Apple Tree. Due to that, the attack can be confused very easy with the attack of Woolly apple aphid (Eriosoma lanigerum). Treatments with Mospilan 20 SG, Actara 25 WG, Decis Mega EW 50, Confidor Energy, Nuprid AL 200 SC. Treatments with Decis Mega, Reldan 22 EC, Fastac, Actara 25 WG, Calypso 480 SC. The first signs of attack appear in may, when twisted and discolored leaves can be observed. It is a polyphagous species that attacks many species of fruit trees. The apricots stop from growing, rot and fall. This tumors generate formations like leaves, buds or sprouts. If the attack is strong the tree losses the leaves from the summer. On the wet weather, the lesions will get covered by a sticky liquid. The disease appears through the wilt and the brunification of the leaves. Each year, it's important to prune your "Honeycrisp" tree to maintain proper growth and fruit production. He has covered breaking news and features for the "Denver Post" and other local publications. On the leaves appear black spots, disposed in the spaces between the nerves. After the attack, the losses can be between to 30-40%. On the upper side of the leaves forms some yellow spots with a reddish tint in the right of which appears some small, black dots that represent the fructification of the fungus. Morning light helps dry the dew from leaves, which can help reduce the spread of diseases. This disease appears in conditions of excessive humidity at the ground level. Destruction of the spontaneous shrubs from the orchards; Treatments with Score 250 EC, Folicur Solo 250 EW, Systhane Plus 24 E, Antracol 70 WP, Polyram DF. In some cases, the nerves can turn yellow. Usually, the attack can be observed on one side of the leaves. The attacked sprouts are brunified, but won’t twist. In the basal area of the trunk appears similar lesions with those produced by the crown gall. The mites are insects that hardly can be seen with the open eye. The cells that compose this tumors are big and deformed. The young fruits wrinkle, brunify and fall massive. Make sure the soil around your "Honeycrisp" does not become waterlogged by installing drainage pits or pipes to carry away excess water. The apples do well in milder climates, producing consistently high-quality fruit. Two varieties are required for successful pollination; one can be a crabapple. On the lower side of the leaves appears some small, grey spots. It seems like most of the leaves have this; is it a nutrient deficiency or something? The new appeared females will lay their eggs on the buds, and the larvae will penetrate in the fruits of the precocious species. The orchard will be founded on the lands that were prepared properly; Disinfection of scissors and tools, before passing from a tree to another; Cutting the affected branches up to the healthy area, appliance of a treatments with Bouillie Bordelaise 4-5% and covering the wounds with cicatrisant mastic resin; The seedling roots will be bathed in a solution of Bouillie Bordelaise 1% or Topas 100 EC 0.025%; Treatments in the vegetation period with products based on copper. Brown rot produced by the fungus Monilinia fructigena. The trees are branchy and look like a bush. Required fields are marked *, Plant Information - How to grow & treat against disease and pests, Apple tree treatments, most common diseases and pests of this fruit tree. Balanced fertilization and rational irrigation. This insects produces defoliation of the trees and low fruit production.