After pesticides are mixed, pesticides that cause chemical harm due to chemical reactions can not be applied separately by using Bordeaux mixture and lime sulfur. They can prevent and treat various diseases, but chemical changes occur soon after mixing, resulting in dark brown copper sulfide precipitation. This not only destroys the original bactericidal capacity of the two agents, but also produces copper sulphate which will further produce copper ions, causing the plants to fall leaves, fruit drop, burning spots on leaves and fruits, or serious injury phenomena such as dry shrinkage.
Acid and alkaline pesticides can not be mixed with commonly used pesticides are generally divided into acidic, alkaline and neutral three categories. Lead fluoride, sodium arsenate, etc. are neutral pesticides. Copper sulfate, sodium fluorosilicate, white peony, and superphosphate are all acidic pesticides. The rosin mixture, lime sulfur, Bordeaux mixture, aluminum arsenate, soap, lime, and lime nitrogen are alkaline. The combination of acid and alkaline pesticides will break down, reduce efficacy, and even cause phytotoxicity. Most organophosphorus insecticides such as dimethoate, kaempferol, malathion, ammonium phosphate, etc., and some microbial pesticides such as kasugamycin, jinggangmycin, quercetin, etc., as well as pigs, rice net and mancozeb With ammonium, etc., can not be mixed with alkaline pesticides. After spraying the crops with lime or ash, the pesticides cannot be sprayed.
Damaged pesticides after mixing cannot use calcium-containing pesticides such as calcium arsenate, lime sulfur, calcium methyl arsenate, etc. Generally, they cannot be mixed with emulsion pesticides, nor can soap be added. Because creams and soaps chemically react with calcium-containing agents, calcium soap precipitates. Emulsions are destroyed, efficacy is reduced, and phytotoxicity occurs.
With the development of the extraction and separation of the active ingredients of medicinal plants, the determination of their composition and structure, and the study of their pharmacological effects, some isolated and purified plant extracts have begun to receive attention. Some companies that produce plant extracts are actively researching and developing such new products, and some larger cosmetic companies have also carried out a lot of research work to separate and prepare pure extracts and apply them to various products. These plant extracts have high active ingredients, do not contain or less contain other irrelevant substances, contain one or several relatively pure components, the content and structure of the components are accurate, and there are clear quality standards and inspections. Methods, products have undergone pharmacological tests, clinical trials and activity tests. The use of such plant extracts is more effective and practical, and it is convenient for product preservation and quality control, but the cost is higher than that of general extracts. The following discusses some of the isolated and purified plant extracts that are used in cosmetics and whose components and structures are well understood.
Due to the influence of traditional Chinese medicine culture, my country's Plant Extract industry has unique development advantages. With abundant resource advantages and technological advantages, China has become one of the most important suppliers of plant extracts in the world.
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