Grab the key prevention and treatment period medication

Plant diseases occur from point to face, from small to large, from light to heavy, to prevent such diseases, and to grasp the critical period of disease prevention and control. Before or after the onset of the disease, it is good to use only one drug. If the drug is used after a large area of ​​the disease, it should be used at least 3 times to stop the spread. This increases the cost of the drug and increases the labor cost. It caused irreparable damage to crops.

Do the right medicine

Many growers do not recognize the condition and are therefore unable to properly select the drug, resulting in poor or even ineffective control. First, mistakenly consider plant physiological diseases as invasive diseases, and use fungicides to treat physiological diseases. Physiological diseases are diseases caused by lack of certain elements. Only by supplementing the corresponding elements can the root disease be cured. If the fungicide is used for prevention and treatment, the medicine is not symptomatic, it is ineffective, labor-intensive, and costly.

The second is to use fungicides to control bacterial diseases and viral diseases, and the therapeutic effect cannot be achieved. Instead, the quality of the purchased drugs is problematic.

Third, there are many types of fungal diseases that occur in crops. If the disease is judged incorrectly, the selected fungicides are not appropriate, and the expected control effects are not achieved. Both gray mold and rust are fungal diseases, but their medications are very different.

The fourth is that the protective fungicide and the therapeutic fungicide are different. The protective fungicide is used before the disease occurs, and a protective film is established on the surface of the stem, leaf and fruit of the plant to prevent the invasion of the pathogen and protect the disease. The effect of the drug before the onset is good, but the control effect after the onset is poor. The therapeutic fungicide generally has a systemic action, which can be quickly inhaled and transmitted to the plant body, killing the pathogen to play a therapeutic role, and should select a therapeutic agent after the onset.

The method of application should be correct

The root disease should be treated by liquid medicine. The disease of the stem part should be sprayed or brushed. The disease of the leaf should be sprayed on both the front and the back and evenly and thoughtfully. For example, the root rot should be sprayed, and the black stem disease of tobacco should be sprayed.

More pesticide knowledge , please pay attention to China Pesticide Network

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