A few days ago, a vegetable farmer asked me with some cucumber leaves: "Do you see if these leaves are bugs?" I said, "Do you see if there are any bugs?" he said: "I look for everything up and down. Didn't find insects all over you, did you see if it was a wormhole?†I took a look at it: the wormhole on the blade showed a “star-shaped†perforation, the edges of the hole were irregular and there were yellow halos, the veins twisted, and the leaves Shrinkage is not smooth, the lesions on the stems are cratered and cracked, and transparent gel particles are spilled.
This is a cucumber scab, belongs to a fungal disease, is a quarantine disease in China and is one of the devastating diseases in greenhouses. Once it occurs, taking care of prevention and control, such as the prevention and control of the time, will cause great economic losses. The relative humidity is about 90%, and the temperature can occur at 9-30°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. Judging from the situation reflected by the vegetable farmer, it was the seeds that caused the disease.
Control methods: 1 selection of disease-resistant varieties. 2 Soaking in warm water of 55-60°C for 15 minutes or soaking with 50% carbendazim WP 500 times for 20 minutes rinse with water and then germination. 3 to strengthen management: In the case of ensuring the temperature, try to put moisture to remove moisture, reduce leaf surface condensation, inhibit bacteria germination and invasion; winter to a small water pouring, can not flood irrigation; often wipe the film, increase light transmittance. 4 Use 45% chlorothalonil smoke agent 300g/mu evening smoked shed for 8 hours. 5 at the beginning of the disease, 10% difenoconazole water dispersible granules 1500 times, 40% fluorosiliconazole 7000 times, and 12.5 % myclobutanil 1500 times, 62%. 25 Methionizole Manzozeb Mancozeb WP 1000 times and other foliar spray for prevention and treatment, depending on the condition 5-7 times.
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