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Whether a lemon tree (Citrus limon) grows outdoors in USDA plant hardiness zones 9 through 11 or indoors in a warm, sunny window, it’s susceptible to leaf curl.For an outdoor tree, cold weather may be the culprit. What can I do to correct leaf curl ? The tree is largely healthy and problem free, but a few pests and errors in care can lead to leaf curl. Of all the lemon pests and diseases afflicting, citrus canker is possibly the most serious. All the products in the nursery state every other fruit tree except Lemon trees. Lemon leaves can curl when the fungal diseases called powdery mildew, greasy spot, anthracnose or scab attack your tree. If allowed to progress unchecked, this lemon tree problem will eventually result in dieback, fruit drop, and leaf loss. Gardeners who believe they may have a citrus tree infested with Asian citrus psyllids or infected with HLB should contact California Citrus Threat Citrus Threat and Disease Prevention Program.. Citrus Leafminers are tiny moth larvae that tunnel through young, new citrus leaves, which may cause citrus leaves to become twisted, distorted, and/or curled. But no lemon tree is immune to inadequate watering or insect attacks. It’s caused by a bacterial infection that results in yellowish, halo-like scabs on the fruits, leaves and twigs. Here are the possible causes of leaf curl in citrus trees: Pest infestations. Citrus Scab Does your lemon tree have areas that look like warts or scabs? The first symptom of citrus chlorotic dwarf on a leaf of a rough lemon seedling after inoculation. My Citrus Leaves Look Like This: Is it nutrient deficiency, bugs or a disease? My lemon tree is putting out new growth but the old leaves are curling. A common reason for leaf curl in citrus trees is insect infestation (pest attacks). The fungus appears as yellow, dark brown, or black lesions that initially occur on the underside of mature citrus leaves. Sulfur spray helps to control mildew. Even citrus trees aren't immune to disease. Fungal Diseases. The bacteria is spread by wind, insects, birds, garden implements and anyone who brushes up against the tree. If you're worried that your Meyer lemon tree may be sick, you need to check out some of the most common Meyer lemon tree diseases that occur and what you can do about them. Citrus canker. Citrus Tree Diseases. Meyer Lemons Meyer lemon fruits have a fragrant, rich lemon-citrus scent and thin, edible skin, combined with relatively high sweetness and low acidity. Curling leaves on these trees is probably a sign of disease, pests, or other problems affecting the plant. Greasy spot is a fungus, known as Mycosphaerella citri, that affects the leaves of citrus trees and thrives in tropical and subtropical climates. Mildew is easy to spot because you’ll see a fuzzy white or gray coating on the leaves. Leaf curling, disfigurement and yellowing of the leaves are all signs of aphid infestation. Greasy Spot. 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