Maintain a soil pH of 6.

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. Citrus trees’ leaves can turn yellow and fall off due to poor nutrients, pests, disease, extreme temperatures, over or under-watering, and anything else that could stress the tree.

In citrus it can be brought on by too much water or poor drainage.

The best fallen tree hardwoods to reverse yellow leaf drop is to identify the issue and fix it as soon as stumppruning.barted Reading Time: 8 mins. Nitrogen deficiency is one of the main causes of yellow leaves on a citrus tree. Nitrogen is a nutrient used in almost every process of life for citrus and fruit trees, from growth to the production of fruit.

A lack of nitrogen in the soil will affect the tree's health, beginning with the leaves. Add a nitrogen-rich fertilizer to the soil early in the spring to prevent nitrogen deficiency later in the growing season.

Jan 21, Nitrogen deficiency - shows as yellowing of older leaves in the tree's foliage. You can add special nitrogen-boosted fertiliser in your feeding to help resolve it. Zinc or iron deficiency - shows as yellowing of new leaves with green veins.

To fix this, use a /5. If your citrus tree is suffering from magnesium deficiency, yellow blotches starting near the base, along the midribs of mature leaves will appear. These areas enlarge until only the tip and the. Apr 22, A number of pests may also be responsible for lemon tree leaf drop. Asian citrus psyllid produces honeydew, which leads to sooty mold as well as causing damage and leaf drop due to the feeding on of the young citrus leaves. Oil sprays can control this pest when applied frequently.

Citrus leaf miners are also an intrepid pest assailing lemon tree leaves. Barely noticeable to the naked eye, leaf miners are not easy to control with chemicals since they are burrowed into their dens between leaf.