Young shoots, flowering stages and young fruit period are the most sensitive periods in the annual growth cycle of fruit trees. The use of drugs is a little careless, and often causes phytotoxicity such as leaf burning, flower damage, and fruit injury. Medication should pay attention to safety, formula should be careful. So how can the spring fruit trees be applied scientifically during the tender stage, flowering stage, and young fruit stage?
1. Avoid the use of drugs during the first physiological drop period.
2. Cannot use "benzene, xylene organic solvents (emulsifiable concentrates), organophosphorus (poison-killing, prochlores, etc.), carbamates (butylthiocarbamate, etc.) during tender shoots, flower buds and young fruit stages. , copper preparations, such as insecticide, acaricide, fungicides pesticides; more can not be used in combination with two organic cream solvent;
3, young shoots, buds, young fruit can not use mineral oil acaricides, so as not to burn young leaves, buds, young fruit and other young organizations, causing falling, fruit drop, deciduous and other phytotoxicity;
4. The acaricides containing high concentration of acetylid have phytotoxicity to young tissues such as spring shoots and young leaves, resulting in imprinting spots. In the growing period of fruit, the concentration is too high and the high temperature is easy to produce phytotoxicity. Therefore, do not use the content of acetylene oxime monotherapy or compounding agent for young shoots, flowering time and young fruit;
5, organic tin (triazotin, fentinyl, etc.) Spring low temperature spring shoots are prone to injury, will cause serious flowering, falling leaves, fruit drop, should be avoided in the spring, summer use should also pay attention to control the concentration;
6, shoot, flowering, young fruit period as far as possible the use of suspension agents, dry suspension agents, water dispersants, wettable powder and other insecticidal, acaricidal, bactericidal and regulators.
7. Try to avoid or use high-dose triazole fungicides (propiconazole, tebuconazole, diniconazole, etc.) and regulators (paclobutrazol, etc.) in order to avoid inhibition of tenderness during tender shoots, flowering stages, and young fruit stages. Shoot growth, shrinkage, shrinkage, stale fruit and other phytotoxicity.
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Intermediate – Intermediate: A material produced during a drug substance processing step that must undergo further molecular modification or refinement to become a drug substance. Intermediates may or may not be isolated. Intermediates are the key products of the previous process of making APIs, which are different in structure from APIs.
for example:
Amoxicillin capsules are called preparations, amoxicillin is called API, and 6-APA is called intermediate.
Ceftriaxone sodium powder is called preparation, sterile ceftriaxone sodium is called API, and 7-ACA is called intermediate.
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Intermediate is a very important type of fine chemical products. Its essence is a type of "semi-finished product", which is an intermediate product in the production of certain products. For example, if a product is to be produced, it can be produced from intermediates, saving costs and reducing It is widely used in the synthesis of medicines, pesticides, coatings, dyes and spices. In the field of medicine, intermediates are an important link in the industrial chain of the pharmaceutical industry. They are used for some chemical raw materials or chemical products in the process of drug synthesis. In a word, they are used to produce APIs.
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