Because many pests and diseases often occur, and most of the drugs can only control one or a certain type of pests and diseases, many farmers hope to achieve the effect of concurrent treatment by mixing two or several agents at a time; others hope to improve by mixing The effect and quick-acting effect of chemical control. Regardless of whether it is mixed or not, you should pay attention to the following three principles: Does not change the physical properties, that is, there is no oil slick, flocculation, sedimentation or discoloration after mixing, and no heat generation or bubble generation. If they are the same powder, or the same granules, fumigants, aerosols, generally can be mixed; between different dosage forms, such as wettable powder, emulsifiable concentrate, thick emulsion, suspension, water solvent, etc. The agent should not be mixed at will. Does not cause chemical changes, including many agents can not be mixed with alkaline or acidic pesticides , under alkaline conditions such as Bordeaux mixture, stone sulfur mixture, carbamate, pyrethroid insecticide, thiram, Daisen ring, etc. Dithiocarbamic acid fungicides are prone to hydrolysis or complex chemical changes that destroy the original structure. Under acidic conditions, 2,4-D sodium salt, 2 methyl 4-chlorosodium salt, amitraz and the like are also decomposed, thereby reducing the efficacy. In addition to acidity and alkalinity, many pesticide varieties cannot be mixed with metal ion-containing drugs. The dithiocarbamate fungicide and the 2,4-D herbicide can be combined with the copper preparation to form a copper salt to reduce the efficacy; the methylthioglycol and the thiophanate can be complexed with copper ions and lose activity. Remove copper preparations, other preparations containing heavy metal ions such as iron, zinc, manganese, nickel, etc., should be used with caution. In addition, the combination of stone sulphur and Bordeaux mixture can produce harmful copper sulfide, which also increases the content of soluble copper ions; chlorpyrifos and butachlor cannot be mixed with organic phosphorus and carbamate insecticides. Because some chemical changes may cause phytotoxicity. Biological pesticides cannot be mixed with fungicides. Under the premise of ensuring the normal use of their original role, consider the following complementary effects: Compounding insecticides, bactericidal and even herbicides, treating multiple pests and diseases at the same time, or mixing fungicides with different bactericidal spectrums, expanding the control targets, and reducing the number of application times. This requires choosing the right timing and potion. For example, in the heading stage of wheat heading, mixed triadimefon, imidacloprid and potassium dihydrogen phosphate can cure aphids, powdery mildew and rust, promote the growth of wheat flag leaves, increase photosynthesis, prolong wheat growth period and prevent dry hot wind. harm. Mixing quick-acting agents with agents that are highly effective, but slow-acting, such as pyrethroid or chlorpyrifos mixed with avermectin; mixing agents with different mechanisms of action (no cross-resistance) can delay the rise of drug resistance The effect also improves the control effect and prolongs the effective period of the medicament. Regardless of the mixture of drugs, you should pay attention to the "current use, not long-time release" and "diluted separately, then mixed" provisions. It is best to experiment first in a small area. The higher goal of mixing is synergy, which requires rigorous scientific testing and analysis, and most of the results have been converted into compound preparations that can be purchased from stores. Any mixture should be limited as much as possible to the occurrence of a variety of pests and diseases and the emergence of a single agent can not control the object or situation, and do not arbitrarily expand the scope of application, can not regard the compounding agent as a spirit. Symptomatic medication is still the most important. Wpc Fence Panel,Hardwood Decking ,Plastic Fence Panels ,Composite Decking Wood Plastic Composite Flooring Co., Ltd. , http://www.china-wpc-decking.com