Strictly prevent phytotoxicity
There are many reasons for the production of fungicides . Generally, agents with strong water solubility are prone to phytotoxicity. In addition, different crops have different sensitivities to the agent. At the same time, the response of crops to chemicals in different stages of growth and development is also different. Generally, seedlings and booting stages are prone to phytotoxicity.
Reminder: The occurrence of phytotoxicity has certain relationship with meteorological conditions such as temperature and sunshine. Generally, it is easy to cause crop phytotoxicity under the conditions of high temperature and drought, strong sunshine or heavy fog and high humidity.
When a reasonable concentration of fungicide spray is applied, it needs to be diluted to an appropriate concentration. If the concentration is too high, it will easily cause phytotoxicity. However, if the concentration is too low, the effect of controlling the disease will not be achieved.
Reminder: Different bactericides have special requirements for their effective concentration. They must be handled strictly in accordance with the instructions during the preparation, and should not be increased or reduced at will.
Cautious drug mix
Many fungicides are alkaline pesticides , so they cannot be mixed with insecticides that are easily decomposed and decomposed by alkaline substances.
Of course, not all fungicides can be mixed with other pesticides. A small number of fungicides can also play a synergistic role when mixed with pesticides.
Select the spraying time
Premature spraying time not only causes waste, but also reduces the control effect; if the spraying time is too late, it will be half the effort because a large number of pathogens have invaded the host or caused harm. Therefore, the application of fungicides should be based on the occurrence of different diseases of the crops, predictions and specific conditions.
Usually, the spraying time of the fungicide should be best before the onset (protective use) or the early stage of the disease (preventing it).
Master the number of medications
The spraying frequency of the bactericide is mainly determined according to the length of the residual period of the drug and the meteorological conditions.
Usually spray every 10 to 15 days, a total of 2 to 3 times. In case of special circumstances, such as rain after application, it should be replenished in time.
Improve the quality of medication
The spray quality of the bactericide includes the amount of the drug and the quality of the spray. Don't increase the cost and cause phytotoxicity because of too much medication, and don't use the medicine because it is too small. When spraying, the fog is required to be fine and uniform. It is necessary to spray the stems of the plants and the front and back of the leaves, so as to avoid leaking.
Attention to avoid drug resistance
Long-term application of a single fungicide (mainly a systemic fungicide) can lead to resistance to pathogens, even if repeated use of the drug does not help.
More pesticide knowledge , please pay attention to China Pesticide Network
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