There are two kinds: lenticels and wounds. Slightly protruding scar spots with lenticels as the core appeared in the early stage of lenticels flow; Then scar spots gradually increased and stood out, with different sizes (5 ~ 13 mm in diameter and 4 ~ 10 mm in height). Finally, the scar point splits and the adhesive generally overflows from the middle of the scar point. The adhesive is colorless and crystallized at first, and then gradually turns light brown after solidification. Scar spots are soft when wet and cold, and hard when dry. When the scar is cut, it can be seen that the epidermis is brown and atrophied, covered with thick glue, and the surface of phloem is dark brown.

The key to the bleeding of wounds is that after fruits, branches and other fruits are bitten, split and cut by mechanical equipment, the characteristics and changes of the bleeding at the edge of wounds are the same as those of lenticels.

2. fruit.

Pale yellow collagen fibers produced by endocrine disorder of flat peach nucleus overflow the fruit surface, and the affected part is hard and sometimes cracked.

3. Main stem.

When seriously ill, the whole tree decays and eventually withers.

Incidence regularity: 1. Stage: There are two peak periods in a year, from mid-late May to mid-June and from mid-August to mid-September.

2. Species: Peach is more susceptible to infectious diseases than white peach.

3. Climatic factors: Since April, spores will be released as long as there is a healthy process.

4. Planting elements. Poor soil layer, insufficient liquid fertilizer and large carrying capacity will all cause this disease. The pathogenic bacteria are hyphae and conidia of party member cadres who died in the wintering branch. In the second year, conidia were produced from the middle and late March to the middle and late April, which spread by wind and rain and invaded from lenticels and wounds.

Prevention of agriculture and animal husbandry: 1, combining rootstock and scion to select and introduce disease-resistant varieties. Natural disease-resistant peaches are used as sticky wood, and high-quality peach varieties resistant to gummosis are selected, such as: Shuanghong Nectarine, Wang Yuhua, Far East White Peach, Dabaifeng and Annong Shuimi Peach. Carry out cross cultivation of peach varieties, cultivate regulator sticky varieties and cultivate disease-resistant green seedlings. We should also pay attention to the infectivity of grafting. Peach trees have strong affinity with peach, mountain peach and cherry, while those with poor infectivity by grafting apricot are easy to remove.

2. Garden management: carry out garden cleaning in winter, cut off diseased branches in winter, concentrate on harm, and spray 29% omethoate 150 times to reduce bacterial sources; The trunk is coated with 20%-25% aluminum chloride for disinfection and sterilization to prevent frostbite and sunburn. When opening the garden, it is best to choose a gentle slope with thick, loose and rich soil layer and smooth irrigation system software. It is necessary to prevent the peach orchard from being contiguous, carefully check the diseases and pests in the peach orchard, especially the branches and roots, and gradually find that it is necessary to apply pesticides immediately, so as to solve the diseases in the early stage, which can reasonably reduce the occurrence of gummosis in peach trees.

Planting windbreak belt can reduce the damage of wind to trunk and reduce the occurrence of gummosis. In a large-scale peach orchard, it is necessary to plant windbreaks to reasonably reduce the damage of strong typhoons to peach trees and reduce the occurrence of wounds and gummosis in July and August.

3. Fertilizer and water management can improve management ability and reduce gummosis. Planting reed, a perennial evergreen creeping woody plant, has a good covering effect and does not damage the growth and development of peach trees and the management methods of plantation. Topdressing organic fertilizer can improve soil colloid and improve soil aeration characteristics. For cohesive soil with strong acidity and alkalinity, lime powder, etc. And tidal sand along the river, loess layer and soil organic fertilizer should be gradually mixed to improve soil consolidation and water-locking ability.

Maintain soil organic matter, make peach trees grow vigorously and improve their ability to resist work. Ensure that the drainage pipeline can be used for waterlogging, water can be injected during drought, and there is no water in the plantation after rain. Peach trees are drought-tolerant and suitable for planting in loose soil layer of sandy soil. Appropriate amount of lime powder or phosphate fertilizer should be applied to acidic soil to neutralize the acidity of soil layer. Clay should be mixed with coarse sand, and drainage pipes should be paid attention to in low-lying areas. Saline-alkali soil should pay attention to salt drainage, effective pruning, reduce wounds, improve plant type and enhance the anti-function of trees.

4. Adjust the trimming time of plastic trimming to reduce the occurrence of gummosis. Peach trees are full of growth and rapid growth. Shortening and pruning are usually carried out during the growing season. The wound is caused by human factors. In the natural environment with moderate temperature and high humidity, the wound is very easy to flow glue. According to the adjustment of pruning period, pruning in growing season is changed to pruning in winter. Although there is a wound in winter pruning, it is very rare for the wound to flow glue because of the low and dry weather.

Therefore, in the growing period, light cutting is adopted, and some branches that are too dense are cut off immediately. In winter, focus on thinning, short cutting and pruning until the leaves are dead. The key is to cut off the branches of pests and diseases, scrape off the unsmooth roots and gums on the branches, and completely eliminate the concentrated harm of dead branches, fruit drop and weeds in artificial forests. In the high temperature and drought season in summer and autumn, covering the garden with weeds or wheat straw with a thickness of 10cm can not only improve the soil moisture of the plantation, but also be beneficial to the growth and development of peach roots and strong tree stems.

5, the trunk is scraped white. The main stem is shaved twice a year to avoid gummosis. After the dead leaves of peach trees are whitened for the first time, then 0.8- 1 Baume omethoate is sprayed on the trunk to wipe the trunk and branches of peach trees. The second scraping is in the middle and late April to reduce the harm of pest impregnation and thermal radiation. In addition, in order to prevent the glue from flowing when the trunk is frozen, measures such as loosening soil, smoking and covering the trunk can be chosen when the freezing damage is serious. When the cold damage is serious, the main stem of the branch can be immediately wrapped with butadiene film or waste pure cotton cloth, which has obvious cold-proof effect.

If it is caused by bacterial infection, then use ampicillin or Ye Shuangqing to spray the main pole. If it is caused by Candida, the main stem can be sprayed or brushed with bacteriostatic agent, triadimefon, thiophanate-methyl, iprodione and so on. The content of main stem is higher than that of spray-dried.