Prevention and treatment of gum disease in peach trees with yellow resin from swollen branches

Peach gum disease, also known as resin disease, the etiology is complex, very common. Gum disease can occur in any part of peach branch tip, which is very common, resulting in tree weakness, fruit quality decline, heavy cause dead branches, dead trees.

Peach gum disease

First, harmful symptoms: gummy disease caused by infectious pathogen occurs in the root neck, trunk, branches and other parts of peach trees. At the beginning of the disease, there was swelling in the branches and the flow of yellowish transparent resin, especially after the rain. With the passage of time, the color of frozen colloid gradually becomes light reddish brown and brown. If the weather is dry, the gel turns into a hard piece of tea brown, which is crystalline and adheres to the epidermis of the branches. The flowing glue caused by non-infection is caused by machinery, insect injury, sunburn, etc., which begins with white transparent gel, then gradually turns brown and red, and then erupts in the case of suitable temperature and high humidity, accumulating on the surface of the wound, mainly in the areas of mechanical injury, insect injury and man-made injury. The damaged peach tree is weak, its leaves become small and yellow, and it is easy to be infected by saprophytic bacteria, which makes the wood rot. Peach gum affects development and loses edible value.

2. The conditions of the disease: from April to October, the temperature began to occur above 15 ℃, and when the humidity was high after the moderate temperature of about 25 ℃, it may break out. The old peach trees have serious glue flow, and the young trees have a mild disease. The disease of peach fruit caused by bugs is easy to occur. Clay loam, thin soil, vegetable garden soil, acid and alkali overweight peach orchard are prone to gum disease.

Third, the cause of the disease:

1. Parasitic fungi and bacteria harm, such as dry rot, rot, anthrax, scab, bacterial perforation, fungal perforation, etc., these diseases or parasitic branches, or endanger leaves, weaken the growth of diseased plants and reduce resistance; 2. Insect pests, especially stem borer, cause wounds and cause gum disease; 3. Mechanical injuries, resulting in wounds and frostbite, sunburn, etc., excessive pruning and re-branching during the growing period; 4. Poor scion and incompatibility rootstock. The soil is bad, such as too sticky, acidic and so on. 5. Poor drainage, inappropriate irrigation, too much water on the ground and so on.

Fourth, prevention and control methods:

1. Strengthen the management of peach orchard and enhance the tree momentum. Increase the application of organic fertilizer, improve soil structure and improve soil ventilation. Low-lying waterlogged land, pay attention to drainage, acid-alkali soil, appropriate application of lime or superphosphate. Improve the soil and pay attention to the discharge of salt in saline-alkali soil. Reasonable pruning to reduce branch wounds and avoid continuous cropping in Taoyuan. For peach trees that have occurred gummy disease, remove the twigs by pruning, scrape off the glue on the branches, disinfect the wound with 4-5 Baumetu stone-sulfur mixture, and smear the glue and the wound with medical purple lotion every 10 days.

two。 Adjust pruning time. Adjust the pruning time, pruning during the growth period to hibernating pruning. Although there are also wounds in winter pruning, there is less glue flow in the wounds because of the low temperature and dry air. Therefore, the growth period to take light cutting, timely heart-picking, thinning and deleting some overdense branches. The main thinning, truncation, retraction and pruning, etc., after defoliation in winter.

3. The trunk is painted white. Brush the trunk twice in winter and summer, the first time after the peach trees have fallen leaves, brush the trunk with 5 Bomedo stone sulfur mixture + fresh cow dung + fresh lime, or mix tung oil with Bard powder, paint the trunk and branches of peach trees, reduce the infection of diseases and insect pests and radiation heat damage, and effectively reduce glue disease.

Prevention and control of peach pests

4. Timely pest control. From April to May, we should timely control longicorn beetles, gibberries and other pests against the roots, trunks and branches of peach trees, and control fruit pests such as peach borer larvae, leaf rollers, pear heart borer, stink bugs, and so on.

5. The whole garden is covered in summer. In the peach orchard without golden edge antler or other green manure, the whole garden is covered with 10cm thick weeds or straw in summer and autumn, which can not only increase the soil water content of the peach orchard, benefit the root growth and strengthen the peach tree, but also prevent sunburn caused by ground radiation heat.

6. Medicine film prevention and cure. If the peach tree glue caused by bacterial pathogen, you can spray and brush the trunk with agricultural streptomycin or Ye Qingshuang. If the peach tree glue caused by fungal pathogen can be sprayed or brushed with antimicrobial agents 401, carbendazim, methyl topudang, isobarbazide and so on, the concentration of brushing the trunk can be higher than that of spraying. Before brushing the trunk, scrape off the glue with bamboo, then brush the solution, or cut the waste clean cotton cloth into strips, soak the solution, wrap it in the affected area, and then wrap it with 10cm wide film. The medicament can choose 1000 times solution of 50% methyl carbendazim ultra-fine wettable powder or 50% carbendazim wettable powder 1500 times liquid or 50% carbendazim wettable powder 2000 times liquid.