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, high efficiency, low toxicity, low residual, long duration, there is a certain fumigation effect on the control of watermelon powdery mildew have a good effect, In the early stage of onset, 25% triadimefon 2000 times can be sprayed, and the concentration cannot be arbitrarily increased during use. Otherwise, it will produce phytotoxicity. When the phytotoxicity occurs, the leaves become smaller and the color is darker green and no longer grow. This should be stopped. Use, and strengthen the management of fertilizer. 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-methyl (wettable powder): thiophanate-methyl, also known as thiophanate-methyl, is a broad-spectrum within the fungicide, low toxicity, can control watermelon powdery mildew, in the early stages of disease, with 70 % Thiophanate-methyl wettable powder 800-1000 times, 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, a control 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 an efficient broad-spectrum fungicide, can prevent melon powdery mildew, downy mildew, etc., no corrosion, easy to stick to the plant surface, it is difficult to be washed away by rain, residual period is 7-10 days, use can not be mixed with alkaline pesticides such as sulfur.

5, tebuconazole: tebuconazole low toxicity, is a high-efficiency, broad-spectrum systemic fungicide, a wide range of sterilization, long duration, with protection, treatment and eradication of three major functions, to pay attention to the concentration during use, So as not to create a major 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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