Root rot can also attack the fruit if it is spread from the soil onto the plant by splashing rain, watering and irrigation systems. The bacteria is spread by wind, insects, birds, garden implements and anyone who brushes up against the tree. Lemon trees attract a wide variety of lemon pests and diseases, many of which can quickly spread across the tree and onto neighbouring trees if not dealt with promptly. They can damage young trees if not controlled by natural predators such as the ladybug. The bacteria is spread by wind, insects, birds, garden implements and anyone who brushes up against the tree. Treating Pests of Lemon Trees. Knowing how to identify lemon diseases and the treatment for diseases of lemons will allow you to take immediate action to miti… Physically remove the caterpillars or spray the tree with an insecticide. Fortunately most can be treated with easily obtainable treatments. Natural predators are a big help in ridding the lemon tree of these insects. © The Gardener. These small lemon tree insect pests cause damage to new growth as they feed, due to their toxic saliva. This can lead to stunted growth, premature ageing of the leaves, leaf drop or even the death of the plant. Prune the lower branches so that they are at least 60cm off the ground and remove leaves and fruit that fall to the ground. It affects the trees’ health, causes the leaves to turn yellow, and causes defoliation and dying back of foliage. 10 Easy Steps to Start Your Own Vegetable Garden, The EduPlant School Gardening and Nutrition Competition. Aphids are notorious plant pests and vectors for many diseases. At the first signs of leaf-miner intrusion the tree should be treated with a suitable insecticide. Find your issue in stores and online today! Without the honeydew, sooty mould will not grow. This treatment can be very effective for the Asian citrus psyllid. Honeydew is a sweet and sticky liquid excreted by these pests as they process the large quantities of sap they suck from the plant. Of all the lemon pests and diseases afflicting, citrus canker is possibly the most serious. The larvae’s tunnelling reduces the leaves ability to photosynthesise, leading to poor growth and low flower and fruit production. Various preparatory treatments are available for aphid control. Various preparatory treatments are available for aphid control. Keep the tree well irrigated and property fertilised to keep its strength up. Oil sprays do not have the downsides of toxic pesticides, yet prove effective against these insects. You can sometimes get rid of insects on lemon trees by spraying the trees frequently with oil sprays. If you are lucky enough to be able to grow your own lemon tree, chances are good that you have encountered one or more lemon tree problems. Unfortunately, there are a plethora of lemon tree diseases, not to mention pest damage or nutritional deficiencies that can affect how, or if, your lemon tree bears. If the tree becomes infected there is no cure and it must be destroyed to prevent the disease from spreading to other trees. Younger trees suffer most and a handful of caterpillars on a small tree can completely destroy it. These are insects that affect lemons, for the mites attack immature fruit. There are a number of lemon tree insect pests. It’s caused by a bacterial infection that results in yellowish, halo-like scabs on the fruits, leaves and twigs. Unless there is a heavy infestation, well-established trees can sustain an attack by these caterpillars. If left unchecked, the disease spreads quickly and can result in blemished fruit, fruit drop, leaf loss and even death of the tree. Sign up for our newsletter. The mould has branching, thread-like hyphae that give it its shape and colour. Systemic insecticides offer a better chance of killing the larvae than contact ones, as they are absorbed by the leaf and kill the larva as it feeds. True to its name, a leaf miner mines passageways through the outer layer of leaves to feed on the soft tissue beneath. Horticultural oil sprays are also effective in treating pests of lemon trees known as citrus rust mites. Of all the lemon pests and diseases afflicting, citrus canker is possibly the most serious. Repeated oil sprays will get rid of insects on lemon trees. These lemon tree insect pests can weaken a young tree, but make little difference to a mature, established tree. This treatment can be very effective for the Asian citrus psyllid. A tree can cope with small numbers, but large populations can cause serious damage resulting in deformed leaves, leaf drop, and twig and branch damage. What appear to be tunnels winding their way through the leaf are usually caused by the larvae of certain moths, sawflies, flies, beetles and some species of wasps. Citrus thrips are tiny orange or pale yellow insects that feed on the sap of young leaves, fruits and branches. These small lemon tree insect pests cause damage to … The tree should be sprayed with an insecticide towards the end of a main flowering period. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Sooty mould is not a lemon pest or disease in itself, but caused by honeydew, a by-product of the feeding habits of other pests such as aphids, leafhoppers, mealybugs, scale insects, psyllids and whitefly. Discolored wood on lemon tree infected with mal secco Symptoms Chlorosis of leaf veins; wilting leaves which drop from plant; the midrib of fallen leaves may have a red discoloration; infected bark may turn silver-grey in color. Aphids are a good example. You love your lemon tree, with its fragrant blossoms and juicy fruit, but insects also love this citrus. So, wherever you find sap suckers, you will encounter sooty mould. Sign up to get all the latest gardening tips! These include relatively harmless bugs, like aphids, and more serious pests, like citrus rust mite, one of the insects that affect lemons rather than foliage. The fungi itself does not infect a plant, and its main damage lies in it reducing sunlight penetration to the leaf, affecting the plant’s ability to photosynthesise. They can also attack foliage and leaves in some cultivars. Several soil-borne fungi can result in root rot. Spray with a fungicide. Treatment is prevention rather than cure, with a liquid copper fungicide. A tree can cope with small numbers, but large populations can cause serious damage  resulting in deformed leaves, leaf drop, and twig and branch damage. The appearance of silvering of the leaf surface, brown frass markings on the leaves and fruits, grey to black markings on fruits, and deformation of the fruit are signs of citrus thrip. This field is for validation purposes and should be left unchanged. Bringing in ladybugs to control aphids is a good, organic option for treatment. Read on for more information about how to get rid of insects on lemon trees. Website Built by Brand Candy. Aphids are notorious lemon pests and vectors for many diseases. The caterpillars, which resemble bird droppings in the early stage, chew the leaves, reducing the plants ability to photosynthesise, which in turn leads to stunted growth.