Chrysanthemum three diseases refer to chrysanthemum gray mold, rust and spot blight. It has been observed that these three diseases often occur in the growing season of chrysanthemum, especially after the autumn. In severe cases, it can cause a large number of fallen leaves, affect plant flowering, and reduce the ornamental value. Measures should be taken as soon as possible.
Gray mold mainly harms the leaves, stems and flowers of chrysanthemums. When the leaves were damaged, they showed brown lesions on the edge of the leaves. The surface was slightly rim-like and wrinkled. The petiole and pedicel were softened first, and then the skin rotted. When flowers are damaged, they affect seed maturity. High temperature and rain, too much nitrogen fertilizer, too dense planting, and heavy soil texture all contribute to the occurrence of diseases.
Control methods: First, planting soil. The pathogenic bacteria mainly overwinter in the soil. Therefore, regardless of whether it is a garden plant or a pot plant, the soil is required to be a disease-free new soil.
Second, diseased leaf strains were found to be cleared in time, buried deep or burned to prevent disease transmission;
The third is to dip the roots 10 to 15 minutes with 65% 300-time solution of zinc citrate before colonization;
Fourth, pay attention to cultivating, pay attention to improving ventilation and light transmission conditions, do not apply nitrogen fertilizer, and prevent soil waterlogging;
Fifth, in the early stage of the disease, Bomi 0.3-0.5 degrees lime sulfur can be sprayed, or zinc carbendazim fungicide.
Rust mainly harms the leaves and stems of chrysanthemums, with leaf victims as the most important. At the beginning, there were small yellow spots on the leaves, and a small brownish green spot appeared on the corresponding parts of the diseased leaves. Afterwards, slightly raised pods were formed. After the pods broke, a large amount of yellow-brown powder was scattered. The color changes from a thirsty color to a yellow-brown color, which often causes the death of the whole plant leaves. Poor cultivation and management, poor ventilation and light transmission, lack of fertilizer or nitrogen fertilizer in the soil, soil waterlogging and excessive air humidity are all conducive to the occurrence of the disease. The disease can be endemic from April to October.
Control methods: First, rational fertilization. Based on the combination of fertilization, appropriate addition of phosphorus and potassium fertilizers to enhance the plant's antibacterial power;
The second is potted chrysanthemum, drainage holes should be often dredge, to prevent waterlogging basin;
The third is ecological disease prevention. Protective cultivation of chrysanthemum should pay attention to ventilation and light transmission, increase temperature and reduce humidity, and delay the time of leaf condensation;
Fourth, chemical control. During the onset of the disease, 65% of Johnson's zinc 500-fold solution, or 0.3-0.5 Baume's lime sulfur can be sprayed, which can effectively control the epidemic.
Spot blotch, also known as black spot disease, mainly harms the leaves of chrysanthemum. Initially, brown spots appeared on the lower leaves and then gradually expanded. The edges were dark brown and later expanded into black-brown circles or irregular spots of near-circular shape. The size was about 5 to 10 mm, and there was an invisible yellow halo outside. The edges of the lesions were dark brown in color and faded slightly in the center. When the humidity was high, there were not obvious dark spots. When the disease is serious, several lesions are connected together, causing the whole leaf to lose power, and the incidence of continuous cropping is serious.
Prevention and control methods: First, rational change for planting, selection of disease-free plants grafted;
The second is to pay attention to trench drainage and reduce soil moisture;
The third is often pruning, eliminating sickness and improving ventilation and light transmission conditions. Implement chemical control technology to promote robust plant growth and enhance disease resistance;
Fourth, chemical control. At the beginning of onset, 30% basic copper sulfate suspension can be used 400 times, or 80% Capitacum wettable powder 500 times, or 50% thiophanate-methyl suspension 800 times or 75% benomyl 1500 times. Prevention.
Gray mold mainly harms the leaves, stems and flowers of chrysanthemums. When the leaves were damaged, they showed brown lesions on the edge of the leaves. The surface was slightly rim-like and wrinkled. The petiole and pedicel were softened first, and then the skin rotted. When flowers are damaged, they affect seed maturity. High temperature and rain, too much nitrogen fertilizer, too dense planting, and heavy soil texture all contribute to the occurrence of diseases.
Control methods: First, planting soil. The pathogenic bacteria mainly overwinter in the soil. Therefore, regardless of whether it is a garden plant or a pot plant, the soil is required to be a disease-free new soil.
Second, diseased leaf strains were found to be cleared in time, buried deep or burned to prevent disease transmission;
The third is to dip the roots 10 to 15 minutes with 65% 300-time solution of zinc citrate before colonization;
Fourth, pay attention to cultivating, pay attention to improving ventilation and light transmission conditions, do not apply nitrogen fertilizer, and prevent soil waterlogging;
Fifth, in the early stage of the disease, Bomi 0.3-0.5 degrees lime sulfur can be sprayed, or zinc carbendazim fungicide.
Rust mainly harms the leaves and stems of chrysanthemums, with leaf victims as the most important. At the beginning, there were small yellow spots on the leaves, and a small brownish green spot appeared on the corresponding parts of the diseased leaves. Afterwards, slightly raised pods were formed. After the pods broke, a large amount of yellow-brown powder was scattered. The color changes from a thirsty color to a yellow-brown color, which often causes the death of the whole plant leaves. Poor cultivation and management, poor ventilation and light transmission, lack of fertilizer or nitrogen fertilizer in the soil, soil waterlogging and excessive air humidity are all conducive to the occurrence of the disease. The disease can be endemic from April to October.
Control methods: First, rational fertilization. Based on the combination of fertilization, appropriate addition of phosphorus and potassium fertilizers to enhance the plant's antibacterial power;
The second is potted chrysanthemum, drainage holes should be often dredge, to prevent waterlogging basin;
The third is ecological disease prevention. Protective cultivation of chrysanthemum should pay attention to ventilation and light transmission, increase temperature and reduce humidity, and delay the time of leaf condensation;
Fourth, chemical control. During the onset of the disease, 65% of Johnson's zinc 500-fold solution, or 0.3-0.5 Baume's lime sulfur can be sprayed, which can effectively control the epidemic.
Spot blotch, also known as black spot disease, mainly harms the leaves of chrysanthemum. Initially, brown spots appeared on the lower leaves and then gradually expanded. The edges were dark brown and later expanded into black-brown circles or irregular spots of near-circular shape. The size was about 5 to 10 mm, and there was an invisible yellow halo outside. The edges of the lesions were dark brown in color and faded slightly in the center. When the humidity was high, there were not obvious dark spots. When the disease is serious, several lesions are connected together, causing the whole leaf to lose power, and the incidence of continuous cropping is serious.
Prevention and control methods: First, rational change for planting, selection of disease-free plants grafted;
The second is to pay attention to trench drainage and reduce soil moisture;
The third is often pruning, eliminating sickness and improving ventilation and light transmission conditions. Implement chemical control technology to promote robust plant growth and enhance disease resistance;
Fourth, chemical control. At the beginning of onset, 30% basic copper sulfate suspension can be used 400 times, or 80% Capitacum wettable powder 500 times, or 50% thiophanate-methyl suspension 800 times or 75% benomyl 1500 times. Prevention.
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