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Cucumber fluid does not have to be Sclerotinia
After entering the low-temperature season, humidity levels inside greenhouses tend to rise. If proper ventilation is not carried out, it can lead to the spread of Sclerotinia, a fungal disease that affects many crops, especially cucumbers. However, many farmers mistakenly identify symptoms as Sclerotinia and rush to apply fungicides like "Sclerotia Net" without confirming the actual cause. This can be harmful and even damage the plants.
So what exactly is Sclerotinia? It typically appears as white, cotton-like fungal growth on cucumber stems or as gray mold in the early stages. In more advanced cases, dark, mouse-dropping-like structures may form. These are key signs of Sclerotinia, which usually occurs at the base of the stem. However, the common phenomenon of "melon strips dripping" or "vine oozing" is not always caused by Sclerotinia. There are several other diseases that can lead to similar symptoms.
First, Cucumber Scab is a common issue. It damages young leaves, stems, and fruit near the growing tip. The growing point may rot within 2–3 days, causing a bald appearance. Leaf lesions appear as small, circular, yellowish spots that turn brown over time. As they dry, they may develop a star-shaped edge. The vines show dark green, water-soaked lesions that become sunken and rough. When broken, they release a sticky fluid, leading to ulcers and wilting in wet conditions. The melons may start to ooze and eventually form dark, pitted spots. This disease thrives in cool, humid environments with temperatures between 15–22°C and relative humidity above 90%.
Second, Cucumber Rot (or Bacterial Wilt) mainly affects the leaves, stems, and fruit. Infected leaves show large, dark brown, water-soaked spots that soften and rot when wet. When dry, they become brittle and break easily. Stems develop soft, water-soaked rot, leading to wilting. If multiple parts are affected, the entire plant may wilt and die. The fruit shows water-stained, dark-green, sunken lesions that exude a milky white fluid, which later turns amber. White mold and foul odors may develop. This disease is most active at 25–30°C and is common during rainy seasons in summer and autumn.
Third, Cucumber Blight (or Angular Leaf Spot) affects the stems, leaves, and fruit. Lesions appear on stems near the roots as water-soaked, light brown areas that soften and crack. Severe cases lead to stem collapse and plant wilting. Leaf lesions begin from the edges, forming a “V†shape or near-brown spots that break easily when dry. Melon surfaces show yellow chlorotic spots that progress to brown, causing deformation and sometimes amber oozing. A key feature is the presence of black spots on all lesions. This disease thrives at 18–25°C with high humidity and is more severe in continuous cropping systems with poor drainage.
To prevent cucumber oozing and related diseases, consider the following measures:
1. Apply chemical treatments such as Shigong or Alu Copper for prevention and control.
2. Reduce greenhouse humidity by watering in small amounts and only during sunny midday hours. On cloudy days, use aerosols to manage diseases while maintaining air humidity.
3. If symptoms resemble Botrytis or bacterial infections, combine treatments with quick-acting agents to prevent re-infection.
4. The most effective strategy is to control air humidity, especially during prolonged cloudy weather. Ensure proper ventilation to lower moisture levels while keeping the temperature stable inside the shed.
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Cucumber fluid does not have to be Sclerotinia