In the middle and lower reaches of the Yangtze River, after the fall, the temperature and humidity are moderate and the light is good. This has created favorable conditions for the breeding, breeding and infestation of some germs, often causing certain flowers to be seriously endangered. Now the symptoms and prevention methods of several common diseases are discussed. Introduced as follows:
Powdery mildew suffers most from flowers such as cineraria, rose, dahlia, eel, impatiens, zinnia, big leaf, and boxwood. The victim site first presents a sporadic distribution of small white spots, which gradually expands and spreads, and develops rapidly. Under suitable conditions, lesions can be covered with the entire leaf in 7-10 days, and the surface of the leaves is covered with a layer of white powder. Like the frost, when severe, the leaves withered and shrank. Plants lose their photosynthetic activity, causing flowers to bloom in small shades, and some even fail to bloom. The disease is characterized by dense stems and leaves, hot weather, poor ventilation and light transmission, and under conditions of soil moisture, the incidence is fast and the damage is heavy.
Control methods: 1, enhance the ventilation and light conditions; increase phosphorus, potash fertilizer, avoid partial nitrogen fertilizer, watering can not be excessive, but can not let the basin soil water, of course, can not be short of water; and timely removal of diseased leaves, disease buds , remove diseased plants and concentrate burned. 2, chemical control. At the onset, some flowers can be sprayed with a 1:1:140 equivalent Bordeaux fluid, or 25% triadimefon 1500-fold, 70% thiophanate-methyl 1200-fold, and 50% eubacterial 1500-fold. Alternate use of the above agents can improve control efficiency. When the disease is heavy, it should be sprayed once every 7 days and sprayed 2 or 3 times.
Brown spot disease is also dominated by harmful leaves. At the time of initial onset, brown spots appeared on the leaves, and afterwards, the lesions gradually expanded and became large spots. The lesions were mostly irregular because of the limitation of veins. There is a faded halo on the periphery. The edges are red-brown and gray in the center. Black dots (conidial organs) are produced in the later lesions. The leaves of the damaged plants are easy to fall off. The leaves of the severe plants do not exist, and the diseased plants gradually move from bottom to top. The whole plant died. To azalea, daffodils, jasmine, clove, sweet-scented osmanthus, paste stems Begonia, heather, lotus and other flowers suffer more.
Control methods: 1, promptly cut sick branches, diseased leaves, concentrated burning, reduce the re-infection of bacteria source. 2, chemical control. After onset, it can spray 80% Captanol 500 times, 65% Zeoxin 800 times, 12.5% ​​Super Poly WP 1000 times, 70% thiophanate-methyl 1200 times every 7~10 times. One day spray, spray 2-3 times.
Flower rot mainly damages flowers, buds, and fruit, and it also damages the leaves. After the leaves were damaged, a small russet spot appeared and gradually expanded, causing the disease department to produce a large amount of gray and white mouldy material. When the buds appeared, they could be infected and rot. The diseased flowers were yellow-brown and withered. The disease was more in autumn and rain, and the humidity was high. Foggy conditions easily occur. The disease is harmful to dahlia, celosia, Chinese rose, crape myrtle, zinnia, wind fairy, and fruit pomegranate.
Control methods: 1, continuous rainy weather, rain measures should be taken, should not let buds, flowers affected by rain. Usually we must strengthen the cultivation and management, increase phosphorus, potash fertilizer, reasonable pruning, enhance ventilation and light transmission. 2, chemical control. Spraying Baume 3 to 5 degrees lime sulfur before the onset of disease can play a protective and preventive role. At the beginning of the disease, it can spray 5% Tianshui agent 500 times, 50% eutectic WP 1500 times, and 75% chlorothalonil 1000 times. When severe, spray once every 7-10 days, continuous control 2 to 3 times. Wang Yougong
Powdery mildew suffers most from flowers such as cineraria, rose, dahlia, eel, impatiens, zinnia, big leaf, and boxwood. The victim site first presents a sporadic distribution of small white spots, which gradually expands and spreads, and develops rapidly. Under suitable conditions, lesions can be covered with the entire leaf in 7-10 days, and the surface of the leaves is covered with a layer of white powder. Like the frost, when severe, the leaves withered and shrank. Plants lose their photosynthetic activity, causing flowers to bloom in small shades, and some even fail to bloom. The disease is characterized by dense stems and leaves, hot weather, poor ventilation and light transmission, and under conditions of soil moisture, the incidence is fast and the damage is heavy.
Control methods: 1, enhance the ventilation and light conditions; increase phosphorus, potash fertilizer, avoid partial nitrogen fertilizer, watering can not be excessive, but can not let the basin soil water, of course, can not be short of water; and timely removal of diseased leaves, disease buds , remove diseased plants and concentrate burned. 2, chemical control. At the onset, some flowers can be sprayed with a 1:1:140 equivalent Bordeaux fluid, or 25% triadimefon 1500-fold, 70% thiophanate-methyl 1200-fold, and 50% eubacterial 1500-fold. Alternate use of the above agents can improve control efficiency. When the disease is heavy, it should be sprayed once every 7 days and sprayed 2 or 3 times.
Brown spot disease is also dominated by harmful leaves. At the time of initial onset, brown spots appeared on the leaves, and afterwards, the lesions gradually expanded and became large spots. The lesions were mostly irregular because of the limitation of veins. There is a faded halo on the periphery. The edges are red-brown and gray in the center. Black dots (conidial organs) are produced in the later lesions. The leaves of the damaged plants are easy to fall off. The leaves of the severe plants do not exist, and the diseased plants gradually move from bottom to top. The whole plant died. To azalea, daffodils, jasmine, clove, sweet-scented osmanthus, paste stems Begonia, heather, lotus and other flowers suffer more.
Control methods: 1, promptly cut sick branches, diseased leaves, concentrated burning, reduce the re-infection of bacteria source. 2, chemical control. After onset, it can spray 80% Captanol 500 times, 65% Zeoxin 800 times, 12.5% ​​Super Poly WP 1000 times, 70% thiophanate-methyl 1200 times every 7~10 times. One day spray, spray 2-3 times.
Flower rot mainly damages flowers, buds, and fruit, and it also damages the leaves. After the leaves were damaged, a small russet spot appeared and gradually expanded, causing the disease department to produce a large amount of gray and white mouldy material. When the buds appeared, they could be infected and rot. The diseased flowers were yellow-brown and withered. The disease was more in autumn and rain, and the humidity was high. Foggy conditions easily occur. The disease is harmful to dahlia, celosia, Chinese rose, crape myrtle, zinnia, wind fairy, and fruit pomegranate.
Control methods: 1, continuous rainy weather, rain measures should be taken, should not let buds, flowers affected by rain. Usually we must strengthen the cultivation and management, increase phosphorus, potash fertilizer, reasonable pruning, enhance ventilation and light transmission. 2, chemical control. Spraying Baume 3 to 5 degrees lime sulfur before the onset of disease can play a protective and preventive role. At the beginning of the disease, it can spray 5% Tianshui agent 500 times, 50% eutectic WP 1500 times, and 75% chlorothalonil 1000 times. When severe, spray once every 7-10 days, continuous control 2 to 3 times. Wang Yougong
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