The cause is a bacterium spread by aphidlike psyllids.

Jul 17, It is not uncommon for citrus trees to naturally drop a small number of leaves especially in winter. Where a large proportion of leaves fall it is a sign that the plant is under stress and there are a number of possible causes.

Low light levels area common reason for leaf drop. Dec 21, It is common for leaf drop during Winter months in the UK, particularly if Citrus plants are in transit during very cold weather. Try to limit big changes in temperature, particularly during Winter by placing Citrus trees in airy porches with no central heating nearby. Citrus Trees need extra TLC during Winter stumpmulching.barted Reading Time: 3 mins.

Transplant shock isn't the only reason that your citrus trees may defoliate. They drop many of their leaves in the spring to make way for new ones, so some shedding during the season is natural.

Jun 12, Sometimes It Just Happens When fruit begins to set on citrus trees, the tree shifts focus from leaves to fruit production. So some leaves will yellow and drop, especially if nutrient levels are below adequate. This is somewhat normal, but make sure to address the above-mentioned issues first. Apr 22, Lemon Tree Dropping Leaves: How To Prevent Lemon Tree Leaf Drop Environmental Causes of Lemon Leaf Problems.

Cold damage and improper watering, namely watering too much, are common Nutritional Deficiencies Causing Lemon Tree Leaf Drop. Sixteen nutrients are necessary for the growth of plants.

This net-vein pattern occurs primarily in young leaves of the fall growth flush as soils cool, reducing root activity. Sodium toxicity Identification tip: Yellowing, bronzing, or browning of leaves and premature foliage drop can be due to excess sodium.

High overall salinity or an excess of either sodium or chlorine can cause this leaf damage or general symptoms throughout the tree resembling drought stress, such. Lemon trees lose their leaves due to over watering, a lack of sunlight, excess wind and due to temperatures consistently lower then 50° F. Indoor lemon trees lose leaves because of transplant shock due to a contrast in humidity, temperature, sunlight and watering frequency when moved from stumpmulching.barted Reading Time: 15 mins.