In its early stages, frogeye leaf spot appears as circular brown spots on apple tree leaves. 1. [h=2]Treatment[/h] 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. Severe infections can affect the entire leaf, causing it to turn brown and drop from the tree. The disease begins in spring as dark, olive-green leaf spots that are less than ½-inch in diameter. I monitored the soil at the base of the tree to ensure that it had adequate water. This is my first fruit tree. 2. These spots gradually grow into brown or black large circles with a velvet-like surface up to half an inch across. Symptoms: Spots on young leaves are velvety and olive green turns black; leaves wither, curl and drop. Prevention & Treatment: Plant resistant varieties for best control. The leaf spots are the first visible symptom to develop on the apple trees. As the fungus spreads over the tree leaves, the leaves will yellow and drop. If anyone has any answers, please let me know. Lesions may also affect the fruit, causing unattractive, sunken yellow, orange or brown spots on the apples. Many of the the leaves have brown spots that appear to have small insects inbedded but I never see any. The ground under the trees is kept clean. 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. ... Apple tree with a yellow sticky trap for apple maggots (Rhagoleti pomonella). 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. Frogeye leaf spot is caused by Botryosphaeria obtusa fungus. There are no brown spots on the leaves that I could see. Apples are susceptible to three kinds of rust: cedar apple rust, quince rust, and hawthorn rust. Fruit also has spots, is deformed, knotty, cracked and drops. The Rust will next appear on the fruit, about two weeks after the spots on the leaves. The leaves of the tree are oval in shape and can reach up to 13 cm (5.1 in) in length and 7 cm (2.8 in) in width. Now, as you can see in the pictures, the dying leaves are spreading. The spots are less than 6 mm (1/4 inch) in diameter and are darker at the edges than at the centre. I looked and I did not see any signs of aphids under the leaves. These eventually grow larger and darker, with red borders and tiny black spots in the centers. 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. The orange spots on your apple trees are a type of rust. 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