Control methods of muskmelon downy mildew

First of all, plant varieties with strong disease resistance. Secondly, do a good job in field management. For example, increase the application of organic fertilizer, chemical fertilizer nitrogen, phosphorus, potassium combined application; July-August rain should not be watered, if the need for water should be irrigated half of the ditch water; timely vine, maintain ventilation and light. Finally, spray the potion. At the initial stage of the disease, 47% Garinon wettable powder was sprayed 700-800 times, 70 liters per mu, once every 7-10 days, and 3-4 times in a row.

Introduction of muskmelon downy mildew

Muskmelon downy mildew is mainly aimed at planting melons in greenhouse all the year round, but it can occur continuously, once it occurs, it is usually out of control, and the epidemic is very fast. It is mainly harmful to leaves, and the disease is most likely to occur after melon fruiting at the adult stage, and the loss is also large.

Muskmelon downy mildew has a wide adaptability to temperature, 15: 24 ℃ is suitable for its disease; excessive watering or watering is easy to occur in moderate to heavy rain, high groundwater level and dense leaves; most of the disease begins in leaves near the root, and the pathogen is transmitted through wind, rain or irrigation water; germ germination and invasion require high humidity conditions, and the pathogen can invade only when the leaf has water droplets or water film, and the relative humidity is higher than 83%.

When infected at the seedling stage, water-stained spots appeared on the cotyledons, then expanded into light brown spots, and a grayish-purple mildew layer grew on the back of the leaves when the humidity was high. When the adult plant is infected, the light yellow disease spot appears on the leaf surface, which expands in a polygonal shape along the leaf vein. When there is condensation or spitting water on the leaf surface in the early morning, the disease spot is flooded, and in the later stage, the disease spot becomes light brown or yellowish brown polygonal spot. Under the condition of continuous rainfall, the disease spot rapidly expanded or fused into large patches, causing the leaves to roll up or dry up, and all the lower leaves dried up, sometimes leaving only a few green leaves near the growing point.

What medicine does muskmelon downy mildew use?

In the early stage of melon disease from July to August It can be sprayed with 47% Carinone wettable powder 700 times 800 times, 60% ethyl phosphine aluminum wettable powder 500 times, 70% ethyl phosphine ·manganese zinc wettable powder 500 times, 18% metalaxamide ·manganese zinc wettable powder 600 times, 64% alum wettable powder 400 times 500 times, 72% Kangling wettable powder 800 times, 56% mountain and water dispersible micro-granules 800 times, 72.2% Pulic water 600 times, 15% Manor Le water agent 200 times liquid, 15% elimination Ling water agent 600 times liquid. Spray 70 liters per mu, spray once every 7-10 days, spray 3-4 times continuously, spray 4 hours after spraying in case of rain, stop using medicine 3 days before harvest.