Symptoms begin as small, bright orange specks on the leaves of the apple tree. The first signs of apple scab occur on the underside of leaves: dull, olive-green round spots, often along the leaf veins and on the leaves closest to the buds. Frogeye leaf spot is caused by Botryosphaeria obtusa fungus. Lesions may also affect the fruit, causing unattractive, sunken yellow, orange or brown spots on the apples. 2. These eventually grow larger and darker, with red borders and tiny black spots in the centers. I monitored the soil at the base of the tree to ensure that it had adequate water. The sign of cedar-quince rust is the presence of rusty spots on your tree's leaves; the apples themselves may also be misshapen and/or suffer from mottling. ... Irregular brown spots/blotches with lighter centers and darker borders on leaves due to black rot disease. In its early stages, frogeye leaf spot appears as circular brown spots on apple tree leaves. Now, as you can see in the pictures, the dying leaves are spreading. Prevention & Treatment: Plant resistant varieties for best control. 1. The spots are less than 6 mm (1/4 inch) in diameter and are darker at the edges than at the centre. Fruit also has spots, is deformed, knotty, cracked and drops. I have two Mac apple trees and they seem to be having trouble I have not identified. Many of the apples have spots and many have worm holes but few worms. The Rust will next appear on the fruit, about two weeks after the spots on the leaves. If you notice leaf spots affecting your trees early in the spring, the afflicted leaves may fall off and new leaves could return sans spots. Flatheaded Apple Tree Borer. The orange spots on your apple trees are a type of rust. These spots gradually grow into brown or black large circles with a velvet-like surface up to half an inch across. I looked and I did not see any signs of aphids under the leaves. This is my first fruit tree. The disease begins in spring as dark, olive-green leaf spots that are less than ½-inch in diameter. Symptoms: Spots on young leaves are velvety and olive green turns black; leaves wither, curl and drop. As the fungus spreads over the tree leaves, the leaves will yellow and drop. There are no brown spots on the leaves that I could see. If however, your tree undergoes this defoliation process more than three years in a row, the tree could be negatively impacted. [h=2]Treatment[/h] Severe infections can affect the entire leaf, causing it to turn brown and drop from the tree. Adults are small brown beetles that may target the graft location (in young apple trees) for laying eggs as well as damaged or sunken areas. Slightly raised, black spots deform the fruits. If anyone has any answers, please let me know. The leaf spots are the first visible symptom to develop on the apple trees. The ground under the trees is kept clean. 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