There are many ways of using fungicides. Each method of use is designed according to the law of disease occurrence. The main methods of use are: spraying three kinds of crops in the field, soil disinfection and bacteria sterilization.
In view of the field crop spraying, the factors affecting the effect of Fungicides on field disease control are no less than the three aspects of pesticides, environment and crops. But the application of fungicides is more demanding than the application of pesticides and herbicides, especially to fully understand the occurrence and development of diseases, because the occurrence and development of diseases are not like insects. Harm and grass damage are so clear.
We should pay attention to two points for spraying crops in the field: first, the type and concentration of pesticides. The choice of medicaments depends on the type of disease, so it is necessary to make a correct diagnosis of the type of disease before the right medicaments can be prescribed. For example, rice blast can be selected rice blast net, rice blast Ling, tricyclazole, wheat powdery mildew, rust to choose triazole alcohol, triazolone, peanut leaf spot to choose methyl tobrazine, etc. But it should also be noted that if the same disease occurs on different crops, sometimes can not use the same chemical, such as Bordeaux liquid can prevent downy mildew, but easy to produce pesticide damage to Chinese cabbage, so it is not appropriate to control downy mildew in Chinese cabbage. After the selection of fungicides, the suitable concentration should be selected according to crop species and growth, fungicide types and dosage forms, and environmental conditions.
Methods to improve the efficacy of fungicides:
It is necessary to dilute water before spraying, whether it is water or wettable powder. Different concentrations of bactericides are required, so it is necessary to strictly follow the instructions for the formulation, a reasonable concentration is more conducive to the efficacy of bactericides. If the ratio is too high, too much concentration will cause phytotoxicity to crops.
Suitable spraying time
The time of spraying fungicides is directly related to the control effect. Early spraying will cause waste of fungicides and reduce the control effect. Late spraying of pathogens has caused harm to crops. Therefore, it is necessary to take timely medication according to the laws, forecasts and specific circumstances of different diseases. Generally speaking, the time of taking fungicides can be chosen before or at the beginning of the disease.
Improving the quality of medication
The quality of fungicides includes the quantity of medication, the frequency of medication and the quality of spraying. The amount of medication should be appropriate, too much medication will increase the cost and cause harm, too little and can not achieve the effect of prevention and control, so according to the specific situation increase or decrease. Drug use times depend on the residual period and weather conditions, usually sprayed every 10-15 days, a total of 2-3 times. If it rains after spraying, it needs additional spray. The way to improve the quality of the medicine is to spray evenly and fine the spray, spray the stem and leaves of the plants.
Prevent drug damage
There are many reasons for the pesticide damage caused by fungicides, such as the pesticide itself, the different sensitivity of crops, the growing stages of crops and climate conditions. Generally speaking, the more water-soluble drugs and crops in the seedling and booting flowering stage, high temperature and drought, fog heavy high humidity and other conditions have a greater probability of drug damage, therefore, need to be carefully handled.
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