The pest can be controlled organically using an oil-based spray. Gall wasps lay their eggs under the bark of the lemon tree, this creates a thick lumpy appearance. Also prune any growth that is touching the ground, this also helps prevent diseases. It’s OK to prune it off, but not really necessary. I have read, understood and agree to The Terms & Conditions and The Privacy Policy and from time to time I may receive special offers and discounts from Organic Gardener, nextmedia Pty Ltd, or its valued partners. Instagram link. Citrus leaf curling has been the bane of many gardens and groves, and once it’s taken root among your crop it can be hard to snuff out. The moth is most active during the summer months so you need to be ready to spray then. Yellow leaves or veined leaves usually indicate a nutrient deficiency or a ph problem most citrus trees like a ph of 6.5 – 6.8. Simply push you finger down into the soil to see if the soil is moist. The tree is largely healthy and problem free, but a few pests and errors in care can lead to leaf curl. Every summer, flushes of new growth fall victim to attack from the ‘citrus leafminer’. The first tip, and most important is where you plant your lemon tree. Facebook link  Leaf Curl Leaf Curl on lemon trees can be caused by a number of factors, to much water is one factor that will cause the leaves of a lemon tree to curl. If the leaves on the lower part of the tree are yellow it is probably poor drainage. The leaves will continue to photosynthesis and produce energy for the tree. However, they would function much better if they weren’t damaged and distorted in this way. To keep the root system happy, apply mulch regularly, and apply a deep mulch 6 inches or 15 cms deep keeping it away from the trunk of the tree itself. However in very hot climates, you may need water regularly. The advantage of the granular type is that is a complete fertiliser with all of the trace elements. Avoid spraying during the heat of the day – that can burn the leaves - wait until the cool of the afternoon. However we find that cow and chicken manure works well for us. Curled leaves disease on lemon plants like limes, lemon and orange trees are a matter of concern as it may indicate significant problems. Twitter link  https://www.bhg.com.au/citrus-leaf-curl-how-to-fix-curling-leaves Ideally the area to the drip-line will be weed and grass free. It starts with the adult, a tiny moth that flutters around at night laying eggs on the fresh new foliage. Brown or Black spots on the foliage can indicate a lack of phosphate, Non Fruiting can be caused by the buds being eaten by small snails. When the grubs have had their fill, they move on over to the edge of the leaf and curl it into a cosy shelter where they pupate. While this activity makes the foliage look ugly and unhealthy, the trees usually survive the attack. Citrus leaf curl is caused by many different things, making positive identification of your problem important before you can determine how to treat leaf curling on citrus. Citrus: how to carry out winter maintenance. Leaf miners are another (see below). Homemade oil sprayIt’s easy to make a low cost oil spray at home. Lemon trees need lots of sun, and prefer an open position. While this activity makes the foliage look ugly and unhealthy, the trees usually survive the attack. However, there are some problems in citrus tress, specifically citrus leaves curling, yellow leaves and brown spots on the leaves. Control weeds beneath citrus trees by weeding well before planting, weed matt or mulch can be used to help prevent weeds. Pour 2 cups of vegetable oil and ½ cup of dishwashing liquid into a jar, mix it well then add 1 tbsp of concentrate to 1 litre of water. But no lemon tree is immune to inadequate watering or insect attacks. Spray to cover the top and bottom of the foliage. Contact Us, growing citrus trees in pots and containers. Leaving fruit on the trees after it has ripened is not recommended, you will find that this can lead to less fruit the next season and disease. This is a problem that can affect all plants in the citrus family. They have shallow root systems, its fibrous and is great at taking up moisture. And keep an eye on things - you may need to follow up with a fortnightly spray to maintain a coating of oil on the leaves. 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. Below are the most common causes of curling citrus, along with ways to manage them. For more information on having a successful citrus harvest read the following: Grow your own delightfully delicious oranges! Here are the conditions that can turn your lush greens to sour yellows: Changes in weather General care of the tree involve removing any fruit that drops to the ground, this reduces the chances of disease. When they hatch, the little larvae or grubs burrow and ‘mine’ their way into the leaf creating their familiar silvery track marks. When the grubs have had their fill, they move on over to the edge of the leaf and curl it into a cosy shelter where they pupate. Insects such as spider mites can also cause problems, check by examining the leaves, especially he underside, check for any sign of damage, or shake the leaves over a sheet of white paper and see if any evidence of mites is apparent.