In recent days, in order to do a good job of technical guidance, six technical instructors, Hu Haiying and Bu Yanyan, went to the countryside to carry out fresh cut flower production and technical guidance at Xinqu Township, Daxin Town. In Daxin Town, the area of ​​carnation black spot developed in Xinqu Park was increased. Through investigation of data, consultation with experts, methods for preventing and treating the disease were collated, slides were made into slides, and training courses were held in the park in time to enable effective prevention and control of the park. stand up.
Carnation black spot, also known as purple spot, pathogens are Alternaria spp., Deuteromycete spp. The disease is an airborne disease. The pathogenic bacteria mainly damage the leaves of plants, and it can also harm stems and flowers. In the early stage of disease development, dark green water-like spots of sesame seed size appear on the leaf or stem or calyx. As the course of the disease progresses and the disease progresses, small spots expand to form nearly round or round, grayish black or purple. Brown spots, lesion diameter of about 0.2-0.3cm. Late onset of disease, often seen on the lesion gray-black moldy layer. The main cause of the onset is that the air humidity is too large for a long time, the temperature difference between day and night causes condensation on the surface of the plants, and the airborne Alternaria spp. accumulates on the plant surface with dew, and causes black spot disease to occur through air holes or wounds. . Control methods:
1. Choose disease-resistant varieties, and adopt ventilation, ventilation, and dehumidification to take measures to reduce the temperature and room temperature difference and reduce the condensation of the plants.
2, chemical control can choose mancozeb, thiophanate-methyl (methyl thiophanate), chlorothalonil (promethazine), carbendazim, sclerotin net, subendoxins, difenoconazole rot Fungal (Sulfacin), SanFuMei (Teubacter) and other agents are recommended to alternate cross-medication to prevent drug resistance.
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