How to control cabbage bacterial leaf spot
First, the symptoms: Chinese cabbage from the seedling stage to the rosette period, the heart period will be infected by the bacteria and then the disease. In the early stage of disease, there are spots on the back of the leaves that gradually grow into irregular keratinous spots. When the air humidity is high, the oily spots on the back of the leaves will overflow the white pyomyocactus, and in the case of air-drying, the lesions will crack and perforate.
Second, the incidence of law: cabbage bacterial leaf spot disease in addition to dipping cabbage, but also dip tobacco, celery, lettuce and other crops. Cabbage seedlings and rosettes encounter rainy weather and are prone to disease.
Third, prevention and control methods:
1, a reasonable rotation, reduce pathogens.
2, according to local conditions, the selection of disease-control species.
3, chemical control. In the early stage of disease, neophytin 4000 times solution or 72% of streptomycin-soluble powder 3000 times for agriculture, spray once every 7-10 days, continuous prevention and treatment 2-3 times. If copper preparations are used, attention should be paid to the use concentration. Cabbage is more sensitive to copper preparations, and excessive concentrations may easily cause phytotoxicity.
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.
Our company specializes in providing key intermediates for various APIs
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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