The plum tree has withered leaves and cobwebs, and the trunk is white and dotted

This condition in plum trees is caused by white spiders (two-spotted leaf mites) or red spiders. It is recommended to spray acaricides such as avermectin, sweep mite, and avida difen. Spider mites are highly susceptible to occurrence in poorly ventilated places.

The insect is extremely small, less than a millimeter, round or oval, mostly reddish-brown, and because of its small size, it is not easy to detect, and when it is known that it is a hazard (it is webed between branches and leaves), the plant is often quite badly damaged. Red spider sucks the juice of plant leaves with mouthparts, so that the leaves show chlorophyll is destroyed, and the leaves show gray and yellow spots or patches, and the occurrence of red spiders in large numbers often causes the branches and leaves to wither and fall off, and even fall light, and when the ventilation is poor and high temperature is dry, the red spider parasitic on the plant reproduces rapidly, and the harm is serious. Red spider reproduces 7-8 generations a year, and begins to be active in March and April every year, and 7-8 months is arrogant, therefore, after April, it is necessary to check the plant frequently, and find that there are differences, such as small yellow spots on the leaf surface, and the leaves are yellow and rolled for no reason, etc., immediately check the back of the leaf (red spiders are mostly gathered on the back of the leaf to suck the juice), once found, spray in time to prevent it.

Prevention and control methods. 40% dicofol EC 1000-1500 times, 20% mite-kill net wettable powder 2000 times. 15% pyridoxine EC 2000 times, 6000-8000 times of chinogenol EC spray the whole plant (the back of the leaf must be sprayed), 2 days later, spray again, can have a good effect.

Plum trees have wilted leaves and white spots on their trunks that may be caused by:

1.Pest and disease infestation: Plum trees can be infested with pests such as white spiders or red spiders, causing leaves to wilt and white spots on the trunk.

These pests usually suck the sap on the underside of the leaves, forming cobwebs. You can consider spraying acaricides such as avermectin, mite-sweeping, avidafen, etc.

2.Fertilizer damage: Excessive fertilization can cause damage to the root system of plum trees, affecting their growth. In this case, the leaves may show undesirable symptoms such as yellowing and curling. It is recommended to reasonably control the amount of fertilizer and avoid excessive fertilization.

3.Anthranose: Small yellow spots on the leaf surface of plum trees can be caused by anthracnose. This condition causes the leaves to gradually lose their green color and eventually wither and fall. You may consider spraying the appropriate biocide to**.

Please note that these are just some of the possible causes, and the specific causes need to be diagnosed based on factors such as the environment in which the plum tree grows, its symptoms, and the severity of its condition. If you have any of the above problems with your plum tree, it is recommended to consult a professional horticulturist or botanist as soon as possible to diagnose and take appropriate measures.

Whoa!! It's too serious. This is not a disease, it is a pest called the mulberry white scale, which can harm a variety of fruit trees, causing the tree to weaken and eventually dry up and die. It can be sprayed immediately: rapid culling or cerex or chlorpyrifos, etc.

Plum brown rot infected, brown round lesions, diseased flesh rot and browning, disease expansion rapid, when the fruit is about to ripen, the fruit rots faster, with the lesion as the center of a circle of granular gray-brown mold layer and arranged into a concentric ring pattern,

Plum tree, plum tree.

Other relevant references to plum trees.

1. After the tree bears fruit, the load is large, organic nutrients give priority to fruit growth, the root growth is inhibited, the ability of the root to secrete acidic substances is weakened, and the iron ions in the soil cannot be effectively absorbed by the root system and iron deficiency symptoms occur, and mainly occur on new leaves.

2. Excessive fertilization or application of unrotted farmhouse manure leads to root burning.

3. The branches are rotten and gelatinous, and the loss of nutrients will also lead to yellow leaves.

Specific prevention and control measures:

1. Root irrigation. For those old trees, weak trees, and trees with serious diseases, they can be irrigated before budding in spring, when the root system grows vigorously, absorbs the liquid quickly, and has a good effect. Dig a circular furrow on the periphery of the canopy of the fruit tree, and irrigate the roots with 100-300 times of R. solanacearum + 600 times of Wofengsu + 300 times of Genjibao.

2. Spray. Liangguoan 200-300 times + garlic oil 1000 times + wofeng 600 times spray.

Nitrogen can judge the status of nitrogen nutrition from the size of the leaf area and the depth of the leaf color. At the seedling stage, nitrogen deficiency in general plants is often manifested as slow growth, dwarf plants, thin and small leaves, and lack of green and yellow leaf color.

Nitrogen has a significant effect on promoting the growth and robustness of plants.

Potassium can enhance the plant's tolerance to various adverse conditions, such as drought, low temperature, salt content, pest and disease damage, lodging, etc.

Phosphorus can promote the formation and growth of early root systems, improve the ability of plants to adapt to external environmental conditions, and help plants withstand the harsh cold of winter.

Nitrogen deficiency: The plant is light green, the old leaves at the base turn yellow, and brown when dry. The stems are short and thin, with few branches or tillers, and premature senescence occurs. If the fruit tree is deficient in nitrogen, it is manifested as small fruit, few fruit, and hard peel.

Phosphorus deficiency: The plants are dark green, often red or purple, and dark green when dry. The stems are short and thin, the basal leaves turn yellow, the flowering period is delayed, the seeds are small and not full.

Potassium deficiency: The old leaves are first yellowed along the leaf margin, and the leaf margin is burning when severe.

Your plum tree may be nitrogen or potassium deficient

Judging from the third photo**, the tree has microfoot disease, which is caused by the distant kinship between the rootstock and the scion.

Countermeasures and Suggestions:1. Soil cultivation of the trunk, and strive to cultivate the soil to the thicker part of the trunk; 2. Carry out moderate pruning in winter, cut off weak branches, diseased branches, overlapping branches, and cross branches, maintain a suitable root-to-shoot ratio, and improve the growth potential of the tree; 3. Strengthen soil, fertilizer and water management and pest control, and improve the nutritional level of trees.

The bark of the trunk was wrong and could not be saved.

First of all, are you sure that it is not short of water? It's almost winter now. The leaves will fall.