Trunk Injection Prevents Diseases

The trunk injection method for pest control is simple, saves pesticides, does not pollute the environment, and is not subject to restrictions such as environmental conditions, height of trees, and damage sites. However, in use, how to choose the right injection drug, the right timing of injection and the amount of drug injection is the key to ensure the desired effect of pest control or lack of disease correction.
Select pesticides based on comprehensive consideration of the pesticide species used in the control object and the conductive properties of the pesticide. Generally, it is required to use pesticides that have strong absorption, are easily absorbed by the tree, and have rapid conduction in the tree body to play a preventive role. In addition, insecticides that prevent long-term effects such as imidacloprid, monocrotophos, etc. can be used to control forest pests, while seroxazin and carbendazim, which have a short residual period, low toxicity, or low transmission to flowers, should be used for the prevention and control of fruit tree pests and diseases. And other pesticides. Do not use highly toxic and high-residue pesticides that are banned on fruit trees. The best water agent, followed by cream.
Proper application of drugs generally starts from the flow of sap in spring, and it can be used for injections before winter trees enter into dormancy. Among them, the use of drugs is best from April to September, but it should be diluted in order to avoid the use of drugs in summer and autumn. Produce phytotoxicity. In addition, we must determine the critical period of prevention and control. In general, leaf-feeding insect pests were injected at the early stage of their hatching, and fulminant pests such as cockroaches and cockroaches were injected before their occurrence. Anoplophora glabripennis and other insect pests were injected at the early stage of their larvae (1 to 3 years of age) and adult emergence. Fruit trees must not be injected within 40 days of fruit picking.
The location, amount, and depth of punching are generally perforated at a location where the lower part of the trunk is 5-20 cm from the ground and the perforating tool is easy to operate. The prevention and treatment of diseases and worms in the leaves or shoots can be perforated in the first branch; the control of root diseases and insects can be perforated in the rough roots near the ground. The number of holes to be drilled should be determined according to the diameter of the DBH. For breasts below 10 cm in diameter, 1 hole per tree, 1 to 25 cm in diameter, 2 holes opposite, 2 to 40 cm in breast diameter, 3 holes in equal diameter, 4 mm or more in diameter . Injection hole diameter is generally 0.5 ~ 0.8 cm, the depth should be based on the size of the fruit tree and the thickness of the cortex may be, usually 3 to 5 cm, the hole depth is the best hole injection needle in the two or three years xylem Department, special attention can not be Too shallow to prevent the liquid from injecting under the bark and not achieve the effect of spraying.
The preparation of liquid medicine should be based on the resistance of trees and pests to determine the appropriate concentration. General forest pest control can take 15% to 20% concentration, fruit trees can take 10% to 15% concentration. If phytotoxicity occurs, inject large amounts of fresh water immediately. If it is an acid pesticide injury, an appropriate amount of quicklime can be added to the injection water to accelerate the decomposition of the pesticide. The preparation of injections is preferably soft water, such as river water, rainwater, and cold water. Acidic substances should not be mixed with alkaline substances. The pH of the prepared solution should be controlled between 4 and 7. If the solution is precipitated or there are too many impurities, the above clear liquid should be sucked in, and the suspension or floc solution cannot be injected into the trunk. The drug solution should be used with the device, and it should not be placed for a long time to prevent the drug efficacy from decreasing.
The injection dose is generally 1 to 2 milliliters of the initial solution of the juvenile tree or pests. If adult trees or diseases and insect pests are harmful, the dosage may be increased. It is advisable to use 3 to 5 ml of the original solution per plant. To prevent the deficiency of fruit trees, the dosage should be increased. Such as the prevention and treatment of apple iron deficiency yellow leaf disease, each strain needs to be injected with 10% of ferrous sulfate solution 15 ~ 25 ml; to prevent zinc deficiency leaf disease in fruit trees, each strain needs to be injected with 60 ml of zinc sulfate solution.

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