Fungicides have a good control effect on plant diseases, insects and weeds, but the use of fungicides is also skillful. If blindly applied, not only can not achieve the desired effect, but also may cause drug damage, resulting in adverse consequences.
Rational preparation concentration
When disinfectant spray is used, it is necessary to mix or dilute the medicament into appropriate concentration by water. Different fungicides have special requirements for their use concentration. When preparing the concentration, it must be strictly operated according to the instructions, and can not be increased or reduced at will. If the concentration is too high, it will be very easy to cause drug damage, and if the concentration is too low, it will not achieve the effect of drug prevention and treatment of disease.
Prudential drug mixing
Many fungicides are alkaline pesticides, so they can not be mixed with pesticides which are easily decomposed by alkaline substances. For example, Bordeaux liquid and stone-sulfur mixture are alkaline and can not be mixed with 1605, dimethoate and dichlorvos, otherwise neutralization reaction will occur and failure will occur. Some fungicides, such as Carbendazim and Beauveria bassiana, can not be mixed with Bordeaux liquid, stone sulfur mixture, toprazine and other fungicides, which will cause the loss of physiological activity of insecticidal (bacterial) microorganisms or the failure of insecticidal (bacterial) ability.
Of course, not all fungicides can not be mixed with other pesticides, there are a few fungicides mixed with pesticides can also play a synergistic role. For example, the mixture of dimethoate and acidic bactericidal agents such as zinc or wet sulfur or colloidal sulfur will not affect the efficacy of dimethoate, on the contrary, it will improve the efficacy of dimethoate.
Election of Spraying Time
Early spraying time not only causes waste, but also reduces prevention and control. However, if the spraying time is too late, a large number of pathogens have invaded the host or caused harm with half the effort. Therefore, the use of fungicides should be timely based on the occurrence of different crop diseases, predictions and specific conditions of disease occurrence. Usually the time of fungicide use should be controlled before the onset or at the beginning of the onset.
Master the Number of Drug Use
The number of sprays of fungicides is mainly determined by the length of residual period of fungicides and meteorological conditions. Usually every 10-15 days spray once, a total of 2-3 sprays. In case of special circumstances, if it rains after spraying, it should be sprayed again in time.
Improving the quality of medication
The spraying quality of fungicides includes quantity and quality of medication. The quantity of medication should be appropriate, neither because of excessive use of drugs to increase costs and cause harm, nor because of too little use of drugs to achieve the purpose of medication. When spraying, the spraying point should be fine and uniform, spraying all over the plant stem and leaf, and striving to achieve no leakage spraying.
Avoiding drug resistance
Long-term use of a single bactericide (mainly inhaled bactericides) will lead to resistance of pathogens, even repeated use of drugs will not help, or even worsen the cost. In order to avoid disease resistance, it is necessary to select pesticides scientifically, make good use of different types of pesticides alternately, and prohibit the long-term use of a single pesticide.
Prevention of phytotoxicity
There are many reasons for the pesticide damage caused by fungicides. Generally, water-soluble pesticides are prone to pesticide damage, and the sensitivity of different crops to pesticides is different. For example, Bordeaux solution generally does not cause pesticide damage, but copper-sensitive crops may cause pesticide damage. Beans, potatoes and cotton are sensitive to Shi Sulfur Mixture and have a higher risk of pesticide damage. In addition, the response of crops to pesticides is different at different growth and development stages, and it is easy to cause pesticide damage at seedling and booting and flowering stages.
Drug damage is related to meteorological conditions such as temperature and sunshine. Drug use in high temperature and drought, strong sunshine or fog, high humidity and other conditions is very easy to cause crop drug damage.
Contact: Mr. Ma
Email: [email protected]
Add: Fine Chemical Industry Park, Jianan District, Xuchang, Henan, China