Cucumber fluid does not have to be Sclerotinia

Cucumber fluid does not have to be Sclerotinia

After entering the low-temperature season, humidity inside the greenhouse increases significantly. If proper ventilation is not carried out, it can lead to the spread of sclerotinia, a fungal disease that affects many crops, especially cucumbers. But what exactly is sclerotinia? Many farmers mistakenly identify any wet or oozing areas on cucumber vines as sclerotinia and immediately apply fungicides like "sclerotium net" for control. However, this is a common misconception because other pathogens can cause similar symptoms. Using these strong fungicides unnecessarily may not only fail to control the actual disease but also harm the plants. Sclerotinia typically appears as white, cotton-like mold growth on cucumber stems or leaves, followed by gray mold in the early stages. In advanced cases, dark brown, mouse-dropping-like structures may form. These are classic signs of sclerotinia, which often starts at the base of the stem. Therefore, not every oozing vine or melon strip indicates sclerotinia. There are several other diseases that can cause similar symptoms, such as: 1. **Cucumber Scab** – This disease affects young leaves, stems, and fruit near the growing point. It causes rotting within 2–3 days, leading to a "bald" appearance. Lesions on leaves appear as circular, yellowish spots that later turn brown and develop a star-like pattern when dry. The stems and vines show dark green, water-soaked lesions, and the fruits may develop pitted, discolored spots. It thrives in cool, humid conditions with temperatures between 15–22°C and high humidity. 2. **Cucumber Rot (Bacterial Wilt)** – This disease mainly impacts leaves, stems, and fruit. Leaves develop large, water-soaked, dark brown spots that become soft and rot when wet. When dry, they break easily. Stems soften and rot, causing wilting. The fruit develops water-stained, dark green, sunken lesions that exude a milky white fluid, turning amber over time. White mold may appear, and a foul odor is present. It occurs most frequently in warm, rainy weather, with an optimal temperature range of 25–30°C. 3. **Blight (e.g., Angular Leaf Spot)** – This disease affects stems, leaves, and fruit. Lesions near the roots appear as water-soaked, light brown areas that soften and ooze. The stems may crack and dry out, while leaves develop V-shaped lesions from the edges inward. Fruits show yellowish chlorotic spots that eventually turn brown and deform. A key feature is the presence of black spots on all lesions. It prefers cooler temperatures (18–25°C) and high humidity. To prevent cucumber oozing and related diseases, the following measures are recommended: - Use appropriate chemical treatments like Shigong or copper-based fungicides. - Control greenhouse humidity by watering in small amounts during sunny midday hours. On cloudy days, use aerosols to manage disease and maintain humidity. - If oozing is accompanied by bacterial wilt or gray mold, add a broad-spectrum fungicide to prevent secondary infections. - Most importantly, focus on reducing air humidity, especially during continuous cloudy weather. Proper ventilation is crucial to avoid disease outbreaks while maintaining stable temperatures inside the greenhouse.

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