Trunk injection precautions
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I. Period of injection: It can be carried out during the growth period from the sprouting stage of the tree buds to the leaves. The best growth period from April to August is the best. The specific injection time should be based on the life history of the pests. Medicine time. After the leaves are deciduous, they cannot be injected during the dormant period before germination.
Second, the choice of pesticides: 50% methamidophos EC, 40% omethoate EC, 75% wet carbofuran powder, 50% acaricidal emulsifiable concentrate, 50% long-acting phosphorus emulsifiable concentrate and other drugs with strong systemicity . Can not use contact agents, stomach poisons without systemic. Appropriate pesticides should be selected depending on the pest.
Third, the injection method: with a diameter of 0.8 ~ 1.0 cm woodworking drill, on the trunk from the ground 15 ~ 50 cm, at a 45 degree angle down the 8 ~ 10 cm deep injection hole, deep to the heart. The tree can be spirally drilled around the trunk to make 3 to 5 holes, the middle tree can be drilled 2 to 3, the small tree can be drilled 1, and the sawdust can be used to inject the liquid with an inhaler or a syringe. If a large area of ​​medicine is injected in the forest area, the hole injection machine can be used first. The orifice should be sealed (with wax seal, mud seal or tape seal). The injection hole can heal after two months.
4. Injection volume: According to the size of the tree, the amount of injection should be determined according to the size of the tree. Generally, the large diameter of the tree with a diameter of 15 cm or more is 6 to 10 ml per plant and the diameter is 10 to 14 cm. The tree is injected with 4 to 6 ml of medicine, and each plant with a dry diameter of 10 cm or less can be injected with 2 to 4 ml.
V. Attentions: 1. When the temperature is not high, it can be injected 1~2 times of the liquid medicine. When the temperature is high in summer, the original medicine should be diluted 3-6 times and then injected to avoid the medicinal damage caused by excessive concentration of the liquid. 2. For fruit trees, the flowering period cannot be injected to avoid poisoning and pollinating insects, affecting pollination and reducing fruit set rate and yield. Stop the injection 30 days before fruit harvesting to avoid leaving residual poison. 3, the tree species (such as peach, apricot, etc.) for easy flow of glue should be as far as possible without drilling, and the method of liquid medicine should be used for prevention and treatment. 4, can not use tree-sensitive pesticides, so as not to cause phytotoxicity.
Urea-formaldehyde resin, also known as urea-formaldehyde resin, is a polymer obtained by the reaction between urea and formaldehyde, abbreviated as UF.It has a series of advantages, such as high bonding strength, fast curing, good operability, low production cost, abundant and easy-to-obtain raw materials, and so on. During processing and moulding, the urea-formaldehyde resin will cross-link, forming an insoluble and non-melting thermosetting resin. The cured urea-formaldehyde resin is lighter in colour, translucent, resistant to weak acids and alkalis, has good insulating properties, excellent abrasion resistance and is relatively inexpensive. However, it is easy to decompose when encountering strong acids and alkalis, and its weather resistance is also poor.
