What are the ways to improve the effectiveness of fungicides?
What are the ways to improve the effectiveness of fungicides? Please give guidance. To improve the effectiveness of fungicides, you can refer to the following methods: 1. Pay attention to the concentration used. When fungicides are applied as liquid sprays, the agent often needs to be mixed or diluted with water to an appropriate concentration. Too high a concentration will cause phytotoxicity and waste, while too low a concentration...
What are the ways to improve the effectiveness of fungicides? Please give guidance.
To improve the effectiveness of fungicides, you can refer to the following methods:
I. Pay attention to the concentration used
When fungicides are applied as liquid sprays, the agent often needs to be mixed or diluted with water to an appropriate concentration. Too high a concentration will cause phytotoxicity and waste, while too low a concentration will have no effect. For some non-wettable or hard-to-wet powders, add a small amount of water first to make a paste, then add more water to prepare it for use.
II. Pay attention to the application time
Applying too early will waste the agent or reduce its effectiveness; applying too late will allow a large number of pathogens to invade the host, and even if a treatment spray is applied, the effect will be very small.
III. Pay attention to the number of applications
Fungicides are generally sprayed once every 10-15 days, for a total of 2-3 sprays. If it rains after spraying, reapply. When using fungicides, consider the cost and use the chemicals sparingly.
IV. Pay attention to resistance
Long-term single use of an agent (mainly systemic fungicides, such as hymexazol) will cause pathogens to develop resistance, making the conventional dosage ineffective and increasing the difficulty of control. To avoid the development of resistance, use different types of agents alternately, such as mixing systemic agents with traditional fungicides.
V. Pay attention to reasonable mixing
Generally, pesticides that easily decompose and lose effectiveness when exposed to alkaline substances cannot be mixed with alkaline pesticides. For example, alkaline fungicides such as Bordeaux mixture and lime sulfur mixture cannot be mixed with 1605, dimethoate, dichlorvos, etc., otherwise chemical reactions will occur. Agents that can cause phytotoxicity also cannot be mixed. A small number of pesticides can have a synergistic effect after mixing. For example, when dimethoate (neutral) is mixed with alkaline fungicides (such as zineb, wettable sulfur, colloidal sulfur, etc.), the effectiveness is not only unaffected, but may even increase slightly.
VI. Pay attention to application quality
The spray volume should be appropriate. Too little application cannot provide thorough protection for all parts of the plant; too much can easily cause phytotoxicity and waste. Spraying should produce fine, even droplets and be applied evenly, covering both the upper and lower surfaces of the plant.
VII. Pay attention to phytotoxicity
There are many reasons why applying chemicals causes phytotoxicity to plants. Agents with strong water solubility are more likely to cause phytotoxicity. Different crops also differ in their sensitivity to agents. For example, Bordeaux mixture generally does not cause phytotoxicity, while cowpea, potato, cotton, etc. are sensitive to lime sulfur mixture and are prone to phytotoxicity. Different developmental stages of crops also react differently to agents; generally, the seedling stage and the booting and flowering stage are prone to phytotoxicity, so use should be cautious. In addition, phytotoxicity is also related to weather and meteorological conditions.
Pay attention to the above seven points on how to use fungicides, and be cautious about mixing chemicals. Many fungicides are alkaline pesticides, so they cannot be mixed with insecticides that easily decompose and lose effectiveness when exposed to alkaline substances, such as Bordeaux mixture and lime sulfur mixture, which are alkaline.
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