Watermelon powdery mildew, also known as "white disease", mainly occurs on the leaves. Severely, it also promotes premature aging or death of plants. It is a serious image of watermelon yield, masters the knowledge of watermelon powdery mildew, and is effective in prevention, thus reducing the economy. There are five types of fungicides commonly used in watermelon powdery mildew, and we will give a detailed introduction to these five watermelon powdery mildew fungicides.
1, triadimefon:
Triadimefon, also known as triadimefon, is a systemic fungicide that is highly effective and low in toxicity. It has a low residue, a long duration, and a certain fumigation effect. It has a good effect on the control of watermelon powdery mildew, and can be sprayed at the early stage of disease. Apply 25% triadimefon 2000 times, the concentration can not be arbitrarily increased during use, otherwise it will produce phytotoxicity. When the phytotoxicity occurs, the leaves become smaller and the color is dark green and no longer grow. This kind of situation should be stopped and strengthened. Fertilizer management. The use of this drug in combination with acidic or slightly alkaline agents can increase control effectiveness, but do not mix with strong alkaline agents.
2. Thiophanate (wettable powder):
Thiophanate, also known as thiophanate-methyl, is a broad-spectrum systemic fungicide with low toxicity and can control powdery mildew of watermelon. In the early stage of disease, it can be used 800-1000 times with 70% thiophanate-methyl WP. Liquid, the effect is remarkable. The long-term single use of this agent will produce a certain degree of resistance, and it must not be mixed with alkaline or inorganic copper preparations.
3, carbendazim:
Carbendazim is a broad-spectrum fungicide that has a preventive effect on melon powdery mildew. Mu with 50% wettable powder 100-200 grams, in the early stages of the incidence of watermelon powdery mildew water spray, interval 5-7 days, a total of 2 sprays, if the resistance area of ​​carbendazim, should be resolutely disabled. This agent can be mixed with other agents, but it must not be mixed with strong alkaline agents or copper-containing agents.
4, chlorothalonil:
Chlorothalonil is a highly effective broad-spectrum fungicide that can prevent melon powdery mildew, downy mildew, etc., has no corrosive effect, and easily sticks to the surface of plants. It is difficult to be washed away by rain, and the residual period is 7-10 days. It cannot be mixed with alkaline pesticides such as limestone.
5. Tebuconazole:
Tebuconazole is a low-toxic, high-efficiency, broad-spectrum, systemic fungicide with a wide range of sterilization and long duration. It has the three functions of protection, treatment, and eradication. Attention should be paid to the concentration during use so as to avoid a serious problem.
The above five kinds of watermelon powdery mildew fungicide should do a good job of protection work during use, comply with the safe use of pesticides operating procedures, in strict accordance with the instructions for use, pay attention to the concentration of agents, so as not to produce phytotoxicity.
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