Cucumber Scab Prevention Techniques

Symptoms Leaf "insect mouth" presents "star-shaped" perforation, the edge of the hole is not neat, and there are yellow halos, veins twisted, leaf shrinkage is not smooth, the lesion on the stem is sunken and cracked, there is transparent plastic Grain overflow. This is cucumber scab, belongs to a fungal disease, is a quarantine disease in China and is one of the devastating diseases in greenhouses. The relative humidity is about 90%, and the temperature can be between 9°C and 0°C. The bacteria invade the epidermis, stomata, and wounds of the crop. There are water droplets in the shed film and the crop leaf inside the shed, which is an important condition for the occurrence of the disease. The humidity in the shed was high, the light was weak, and the incidence was heavy under the climatic conditions after the watering. The germs are present in the greenhouses as mycelium and become the initial source of infection; conidia can also be attached to the surface of the seed or the mycelia can be latent in the seed coat to carry the seed. The seeds can invade the seedlings and the colonized seedlings can be colonized. After the disease will soon.

Control methods used disease-resistant varieties, soaked with warm water 55 °C ~ 60 °C for 15 minutes or 50% carbendazim WP 500 times soaking for 20 minutes, rinse with water and then primed. In the case of ensuring the temperature, as far as possible to release air to remove moisture, reduce leaf surface condensation, inhibit the germination and invasion of bacteria, often wipe the film, increase the transmittance. With 45% chlorothalonil smoke agent 300 grams per acre night smoked shed about 8 hours. In the early stage of disease, 10% difenoconazole water dispersible granules 1500 times, 40% fluorosiliconazole 7000 times, 12.5% ​​myclobutanil 1500 times, 62.25 myclobutanil Mancozeb WP 1000 Leaf liquid spray and other control, depending on the condition 5 to 7 times.

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