Fungal Leaf spot of cut Carnation
Symptoms: a purple round spot between the diameter of 0.5~1.5cm, surrounded by a yellowish-green edge; then the middle of the spot becomes brownish gray and dry, and finally the spot expands, black spores appear, and the leaves begin to turn yellow and fall off. Reasons: watering from the upper part of the plant, poor ventilation, high humidity at night, excessive watering and fertilization after planting is also one of the causes of the disease.
Control methods: keep the plant dry as far as possible, it is best to use drip irrigation, keep good ventilation. Use 1% Bordeaux solution or 75% chlorothalonil wettable powder 500 times solution, or 75% mancozeb 500 times solution, carbendazim 500 times solution, etc. According to the severity of the disease, it was sprayed once every two weeks. In a continuous rainy and humid environment, spray medicine twice a week.
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Occurrence and control of carnation virus disease in protected area
Symptom recognition carnation vein mottle disease carnation leaf vein mottle virus infects carnation, Chinese carnation and American carnation, all produce systematic mosaic, and old leaves often appear hidden phenomenon in winter. Discoloration spots appeared on the petals, especially in the varieties of large red flowers. Carnation latent virus disease Carnation generally shows no symptoms or mild mosaic symptoms after being infected by the virus. However, mosaic symptoms occurred when carnation latent virus and carnation vein mottle virus were co-infected. Carnation
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Key points of fresh-keeping technology of mushroom
The main factors affecting the preservation of mushrooms are as follows: temperature: the higher the temperature, the worse the preservation of mushrooms. 0-4 ℃ is the suitable temperature for mushroom preservation. In addition to quick freezing, freezing injury is easy to be caused when the temperature is less than 0 ℃. Water quality: when the content of iron or copper in the water is more than 2 mg / L, the mushroom color darkens and turns brown, so iron and copper utensils and tools are prohibited. Humidity: 95-100% required. Less than 90% of the color darkens and it is easy to open an umbrella and deteriorate. Gas composition: it contains important causes of decay, which can be inhibited by sterilization and adjusting pH value. Enzyme activity
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