Of all the lemon pests and diseases afflicting, citrus canker is possibly the most serious. If allowed to progress unchecked, this lemon tree problem will eventually result in dieback, fruit drop, and leaf loss. What can I do to correct leaf curl ? Sulfur spray helps to control mildew. Can I use what is available or does anyone know of something else A common reason for leaf curl in citrus trees is insect infestation (pest attacks). Meyer Lemons Meyer lemon fruits have a fragrant, rich lemon-citrus scent and thin, edible skin, combined with relatively high sweetness and low acidity. It’s caused by a bacterial infection that results in yellowish, halo-like scabs on the fruits, leaves and twigs. Curling leaves on these trees is probably a sign of disease, pests, or other problems affecting the plant. Greasy Spot. Lemon leaves can curl when the fungal diseases called powdery mildew, greasy spot, anthracnose or scab attack your tree. Greasy spot is a fungus, known as Mycosphaerella citri, that affects the leaves of citrus trees and thrives in tropical and subtropical climates. Citrus canker. Fungal Diseases. Citrus canker – A highly contagious bacterial infection, citrus canker causes yellow halo-like lesions on fruit, leaves and twigs of citrus trees. Leaf curling, disfigurement and yellowing of the leaves are all signs of aphid infestation. 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. Even citrus trees aren't immune to disease. Citrus Tree Diseases. The first symptom of citrus chlorotic dwarf on a leaf of a rough lemon seedling after inoculation. Here are the possible causes of leaf curl in citrus trees: Pest infestations. The bacteria is spread by wind, insects, birds, garden implements and anyone who brushes up against the tree. The tree is largely healthy and problem free, but a few pests and errors in care can lead to leaf curl. Note the notch on the left margin of the leaf, which is symptomatic for this disease. The fungus appears as yellow, dark brown, or black lesions that initially occur on the underside of mature citrus leaves. Citrus Scab Does your lemon tree have areas that look like warts or scabs? 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. My Citrus Leaves Look Like This: Is it nutrient deficiency, bugs or a disease? 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. 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