Bacterial blight, gray mold, sclerotinia, anthrax, and bacterial soft rot all cause rot in cucumber stalks. Symptomatic treatment should be identified.
Blast disease Most recent cucumber vines are caused by spoilage. The symptoms of bacterial blight on cucumber stalks are oval-shaped or diamond-shaped white lesions at the onset of the disease. Sometimes milky gelatinous substances flow out, and the stems and vines are cracked when severe, eventually causing the vines to rot. The leaves are also susceptible to disease. The bacteria begin to invade from the edges of the leaves and develop inwards. The shape is "V" shaped, the lesions are light yellow, there are unclear ring patterns, and there are many small black spots on the top.
Cucumber leaf blight occurs when the temperature is 18-25°C and the relative humidity is above 85%. Winter greenhouse management should pay attention to warming and humidity removal. The daytime temperature is controlled at 25~33°C and nighttime at 15~20°C. Under the premise of guaranteeing the temperature of the greenhouse, there is a great relationship between the amount of water. It is advisable to use the method of pouring small water under the membrane to water, and to use water as the degree of water. Diseased plots should be removed as soon as possible from sick branches and diseased leaves, and brought out of the shed or buried.
After the cucumber enters the fruiting period, it absorbs a large amount of nutrients due to fruit enlargement, resulting in thin and thin stems, thinning leaves, reduced resistance to plants, and easy infection by pathogens. It can be sprayed with 80% thiram WP or 75% chlorothalonil wettable powder 500 times every 7 to 10 days. After onset, it is sprayed with 25% Prochloraz EC 1000 times.
Gray mold Grey mold is a disease that occurs on cucumbers in greenhouses in winter, and most of them invade from residual flowers, causing melon rot. The infected streaks and rotten melons adhere to the vines and cause the vines to rot. In severe cases, the vines are broken and the plants die. The bacteria can produce a large number of spores, spread with the airflow, the condition is more difficult to control. Gray mold is prone to occur when the temperature is 20~23°C and the relative humidity is above 90%. Before the onset of the disease, 40% carbendazim WP or 75% thiophanate-methyl WP can be sprayed at a dose of 500 times every 7 to 10 days. After the occurrence of gray mold should control the amount of air release, keep 38 to 40 °C high temperature boring shed 2 hours to kill a large number of bacteria in the shed. At the same time, 40% carbendazim wettable powder (500x liquid) spray was sprayed with 50% procymidone wettable powder or 50% ethylene nucleus water dispersible granules (500 times liquid). Combining 50% procymidone and other smoked sheds to kill shed bacteria.
Sclerotinia Stem infected mostly in the stem near the ground began to disease, the initial appearance of light brown water-stained lesions, soft stem later disease stem rot, grow white cotton flocculent hyphae. The medullary cavity of the diseased department was rotted or cracked, and the mycelia of the latter stage formed dense black rat urea nucleus. The appropriate temperature for the onset of S. sclerotiorum is 24°C, and the relative humidity is 85% or above. When the humidity in the greenhouse falls below 80%, it does not become an onset. Sclerotinia should pay attention to environmental regulation, reduce the humidity within the greenhouse. Chemical control can be sprayed with 50% vinyl sclerotin water dispersible granules or 50% procymidone wettable powder 500 times, or with 50% procymidone smoke.
Anthracnose is the main culprit and petiole. The lesions are oval, tan, and sags, and when severe, the main vines are surrounded by a piece, causing the plants to die in part or in whole. When the relative humidity was above 87% and the temperature was 24°C, cucumber anthracnose showed obvious symptoms from infestation in only 3 days, and the onset rate was fast. For non-pathogenic plants, protective fungicides such as chlorothalonil can be used to prevent disease. After onset, it can be sprayed with 25% bromomycetin wettable powder (500 times liquid) or 25% prochloraz (1000 times liquid) mixed with 80% thiram wettable powder (750 times liquid) spray control.
In the early stage of bacterial soft rot, stems became water-stained and turned brown and curled. The leaves wilted from the bottom to the top. Noon was more severe and could be recovered sooner or later. Finally, the whole plant withered and died. Cut open stems and squeezing out milky white pus from the vascular bundles. The vascular bundles generally do not change color.
In the management process, care should be taken to reduce wound production. Spread the vine before watering, so as to avoid the water content of the stalk after watering, resulting in broken vines, increased wounds, and not easy to heal. Select sunny leaves in the afternoon and pick up the leaves and spray them in time to reduce the chance of pathogens invading from the wound. You can use 72% of agricultural streptomycin sulfate soluble powder 1500 times or 3% of Zhongshengmycin wettable powder 500 times. Strengthen fertilizer and water management, reduce root damage, and enhance plant resistance.
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