Manson Manganese Zinc is an old drug used for many years in China. Farmers use it at a high frequency and have a large market capacity. When talking about this product, manufacturers, distributors, and farmers will give him the “conventional” “old drug” and “large goods”. "The supporting role" "fool fungicide" label. However, it has been found in the market that it is precisely such a “mature” old drug that actually has a lot of problems. The phytotoxicity problem is a problem that people are more concerned about. In this regard, the market sees it as a small article. For reference.

Mancozeb is a broad-spectrum, low-toxicity, low-residue, high-efficiency, multi-site protective bactericide that does not easily produce resistance. It belongs to organic sulfur-based bactericides and can form on the surfaces of leaves and fruits after use. The breathable, water-permeable and light-transmitting dense protective film inhibits the germination and invasion of pathogenic spores and destroys the activity of various enzymes required for the normal physiology and metabolism of germs, so as to achieve the purpose of bactericidal and disease prevention, and can prevent and control fungal diseases of various crops. Has become an important species in the fungicide, mancozeb has excellent compounding, can be mixed with a number of systemic fungicide, broaden the spectrum of sterilization, to achieve a complementary mechanism of action, improve the efficacy, delay the The production of insecticide resistance has become an important part of compound fungicides. To date, the use of mancozeb has been used for more than 50 years in the world. It has also been used in the country for nearly 30 years. It has now become our country. One of the major protective fungicides for fruit trees and vegetable growing areas.

The author found in the production that many farmers in the process of using mancozin, due to improper drug selection or application time, dose, number of improper production of phytotoxicity, light caused damage to the leaves, weakening photosynthesis, affecting crop growth, In severe cases, drug spots (brown spots, macular spots, net spots, etc.) are formed on the fruit surface and leaves, causing even large fruit spots, rough fruit surfaces, and fruit rust, which seriously affect the commercial value of the fruit. The farmers have suffered heavy losses. It is found that the main cause of drug injury is due to the following reasons:

1. Unqualified mancozebs cause high drug damage. Qualified mancozebs should be manganese-zinc complexes of mancozenic acid under the heat-complexation process. There are small businesses and counterfeiters on the market. Their products cannot be called mancozeb in nature. Some small companies, Due to limitations in production equipment and production processes, only a small part of actual production will be complexed into mancozeb, most of which is a mixture of mancozeb and zinc salts. These products are dark in color, contain high levels of impurities, and are subject to wet conditions. Heat is easily degraded and it is extremely easy to produce phytotoxicity when these varieties are used. For example, the use of poor quality mancozeb in apple young fruit will affect the fruit surface wax deposition, make the skin damage, resulting in circular medicine damage spots, spots with fruit development and expansion.

2. Blind drug compounding affects the safety of mancozeb use. Pesticide compounding should be considered from many aspects such as the active ingredients, physicochemical properties, control effects, and prevention and control targets of pesticides. Blind compounding will not only reduce the efficacy but also increase the risk of phytotoxicity. For example, the combination of mancozeb with alkaline pesticides and copper-containing heavy metal compounds will reduce the efficacy of mancozeb, and the mixture of mancozeb and phosphate will show flocculent precipitation with hydrogen sulfide. The gas is escaping.

3, pay no attention to the choice of spraying time to adjust the spray concentration to increase the risk of injury. In actual use, in order to improve efficacy, many farmers prefer to reduce the dilution factor to the highest concentration on the instructions when dispensing, and even use the highest concentration higher than recommended in the manual, thus increasing the risk of drug injury. At the same time, the farmers mixed various pharmaceutical agents to increase efficiency, only took note of the differences in trade names, and ignored the active ingredients and content. In the process of compounding, the same active ingredient dosage was added, and the drug concentration increased in phase and exceeded the safe concentration. , causing phytotoxicity. The use of drugs under high temperature conditions will increase the activity of pharmaceuticals, and the spraying of pharmaceuticals at high concentrations will increase the risk of injury.

4. The quality of the product affected the safety of mancozeb zinc. The fineness, suspension rate, wettability, and spreading performance of Manson Manganese Zinc Powder influence the efficacy and safety of the product. Some Mancozebs are affected by the production process, and the fineness, suspension rate, and wetting There are deficiencies in the technical indicators such as sexuality. In the actual use process, drug layering, chemical precipitation and clogging of spray nozzles are common. Precipitation of chemicals in the spray process causes inconsistency in the concentration of sprays during the spraying process, and the lack of concentration reduces the efficacy. If the concentration is too high, phytotoxicity can easily occur. The poor performance of the pharmacy exhibition, coupled with the large amount of spray water, the drug can not spread well on the foliage, will cause the liquid to accumulate at the tip and fruit surface, resulting in high local concentration, resulting in spots of injury.

Damage prevention measures:

1. Scientifically use drugs during the sensitive period of crops. The sensitive period of crops is the key period for the use of protective agents. To ensure the efficacy of the pesticides, the use of mancozeb must be selected from the regular manufacturers, and it is preferred to use foreign excellent fully complexed agents, such as sprays. Grams (80% Mancozeb WP) are produced through a thermal complexing process and have a high degree of complexity. They are produced using a four-stage ultrafine particle crushing technology. The particles are finer, the suspension rate is higher, and the chemical safety is high. It has been used in China for more than 16 years. It has been found in actual production that it is safe to use in sensitive seasons such as young leaves, flowering stages and young fruit stages.

2, strictly control the concentration of mancozeb zinc, can not arbitrarily adjust the concentration of drug use, need to refer to the instructions and product label instructions, in a safe and efficient concentration range. During the compounding process, care should be taken not to mix various agents containing mancozeb active ingredients.

3. To use mancozeb zinc in high temperature season, in order to avoid the occurrence of phytotoxicity, avoid high temperature time medication at midday, or adjust the dilution of the drug and use lower concentration.

4. Scientifically and rationally mix pesticides. Mixing a variety of pesticides can not only expand the scope of use, but also can increase drug resistance delay resistance. When a variety of pesticides need to be mixed and used, the need to select targeted pesticide species, to avoid a variety of agents and the same active ingredients Repeat the compounding, and at the same time, first do a compounding test to observe whether there is a reaction between the agents. When it is confirmed that there is no precipitation, stratification, discoloration, and oily substance precipitation after compounding, it can be used.

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