1. The difference between mancozeb and complex Mancozeb
(1) Mancozeb: Mancozeb has many advantages such as being applicable to many crops, wide bactericidal spectrum, good bactericidal effect, and good mixability. However, mancozeb contains a large amount of free manganese ions and cannot be used during the flowering stage and young fruit expansion stage of crops. It is prone to phytotoxicity and fruit rust, which greatly limits the use of mancozeb. Therefore, manganese ions were extracted during the production process to generate zinc. However, the scope and effect of mancozeb in preventing and treating diseases are too different from mancozeb, so scientists conducted further research and synthesized mancozeb in complex form.
(2) Complex Mancozeb: In the production process, organic zinc ions are used to wrap the more active manganese ions. After spraying, manganese ions are slowly released, so no harm occurs, the effect of disease prevention and treatment is significantly improved, and the duration of effect is also greatly extended. The particle size of complexed mancozeb is smaller and easier to dilute, which overcomes the shortcoming of easy precipitation of mancozeb. If the manganese ions are all wrapped in the middle during the production process, it will be a fully complexed mancozeb, which is safer and more effective when used.
2. Main characteristics of complexed mancozeb
(1) Good safety: Fully complexed mancozeb wraps manganese ions, which are prone to phytotoxicity, with complexes in the middle, making it difficult to come out all at once. Therefore, if sprayed in time during the flowering stage, no phytotoxicity will occur, and if sprayed during the young fruit stage, no fruit rust will occur, and the safety is greatly improved.
(2) Wider bactericidal spectrum: Fully complexed mancozeb can be used in more than 90 crops and prevents and controls more than 400 diseases. It is currently the most widely used fungicide that controls the widest range of diseases.
(3) Better effect: The production process of fully complexed mancozeb is relatively strict, and the particles are smaller, easier to diffuse in water, and easier to be absorbed by crops. Therefore, the effect of preventing and treating diseases is more significant, not only having a protective effect, but also having a therapeutic effect.
(4) Longer duration of effect: Fully complexed mancozeb, due to the complexation process, exists in the body of the crop for a longer time after being absorbed by the crop. Therefore, the duration of disease control will be longer and the number of sprays will be reduced.
(5) Better mixability: Fully complexed mancozeb can be compounded with dozens of fungicides such as dimethomorph, oxalaxyl, cymoxanil, metalaxyl, azoxystrobin, oxastrobin, and fluopicolin. It is currently the fungicide with the most compound preparations, and its synergistic effect is very significant.
3. Scope of application
Fully complexed mancozeb has a broad bactericidal spectrum and high safety. It can be widely used in more than 90 crops such as wheat, corn, cotton, peanuts, soybeans, rice, sesame, cucumber, watermelon, tomato, eggplant, pepper, cabbage, cabbage, apple, pear, cherry, mango, peach tree, kiwi fruit, etc.
4. Prevention and control objects
It can be used to prevent and control more than 400 diseases such as early blight, late blight, downy mildew, blight, downy mildew, leaf spot, ring spot, white rot, canker, scab, spotted leaf disease, powdery mildew, anthracnose, red spot disease, black shank, scab, boll rot, rust, corn spot, stripe spot, brown rot, and root rot.
5. How to use
(1) Single dose use
Generally, before the onset of crop diseases or in the early stages of the onset, fully complexed mancozeb alone can achieve good preventive and protective effects. Generally, 50 to 70 grams of 80% fully complexed mancozeb wettable powder is used per mu, mixed with 30 kilograms of water, or 500 to 600 times the liquid and sprayed evenly.
(2) Use of mixture
Generally, when serious crop diseases occur, fully complexed mancozeb can be mixed with other therapeutic agents to achieve the effects of prevention, protection, treatment and eradication. Commonly used mixed preparations include 72% manganese zinc with fenfluramine, 69% manganese zinc with dimethomorph, 68.75% manganese zinc with oxazole, 64% manganese zinc with oxazole, 60% manganese zinc with fluorobacteria and other mixtures. According to different diseases, appropriate mixtures can be selected for spray control.
