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What can I do to correct leaf curl ? All the products in the nursery state every other fruit tree except Lemon trees. Mildew is easy to spot because you’ll see a fuzzy white or gray coating on the leaves. A common reason for leaf curl in citrus trees is insect infestation (pest attacks). Citrus canker – A highly contagious bacterial infection, citrus canker causes yellow halo-like lesions on fruit, leaves and twigs of citrus trees. Here are the possible causes of leaf curl in citrus trees: Pest infestations. Greasy spot is a fungus, known as Mycosphaerella citri, that affects the leaves of citrus trees and thrives in tropical and subtropical climates. Citrus Tree Diseases. My lemon tree is putting out new growth but the old leaves are curling. Lemon leaves can curl when the fungal diseases called powdery mildew, greasy spot, anthracnose or scab attack your tree. Citrus canker. 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. 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. The tree is largely healthy and problem free, but a few pests and errors in care can lead to leaf curl. It’s caused by a bacterial infection that results in yellowish, halo-like scabs on the fruits, leaves and twigs. Note the notch on the left margin of the leaf, which is symptomatic for this disease. Fungal Diseases. If allowed to progress unchecked, this lemon tree problem will eventually result in dieback, fruit drop, and leaf loss. My Citrus Leaves Look Like This: Is it nutrient deficiency, bugs or a disease? Even citrus trees aren't immune to disease. Meyer Lemons Meyer lemon fruits have a fragrant, rich lemon-citrus scent and thin, edible skin, combined with relatively high sweetness and low acidity. Greasy Spot. The bacteria is spread by wind, insects, birds, garden implements and anyone who brushes up against the tree. Citrus Scab Does your lemon tree have areas that look like warts or scabs? But no lemon tree is immune to inadequate watering or insect attacks. 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. Curling leaves on these trees is probably a sign of disease, pests, or other problems affecting the plant. 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