Blight The pathogen of blight is Rhizoctonia solani, and its optimum temperature for growth is 24 to 28 ° C. When the temperature of the plant seedlings is 20 ° C, the plant seedlings are prone to blight. If the terrain is low, the soil is sticky, the former crop is the host plant and the old seedbed soil, and the application of the under-fertilized compost is used, the disease will be aggravated. The symptom is that the stem base produces elliptical dark brown lesions. Sometimes, Light brown hyphae can be seen in the diseased department.
Control methods: 1. Before planting, choose a nursery with higher topography, better drainage, loose, disease-free or mild disease. 2. Use formalin fumigation, add 30 to 27kg of water per 360 square meters of seedbed with 360ml of liquid medicine, spray the liquid evenly, then cover with plastic film tightly, after a week, uncover the film, loosen the soil, and let the medicine fully evaporate. Sowing two weeks later. 3. At the onset of the disease, the base of the seedlings is sprayed with a solution of 70% thiophanate-methyl WP 1000 times, or it can be mixed with grass ash (8:2) and sprinkled on the base of the seedlings.
Powdery mildew is common with morning glory powdery mildew, purple powdery mildew, and cineraria powdery mildew. The condition is almost the same. White mildew spots appear on the leaves at the initial onset, and then rapidly expand and connect with each other to form a large white mold layer. Severely, the diseased plants will be deformed and dwarfed, and some will not bloom normally, and the leaves will turn yellow and die.
Control methods: 1. Plants should not be too dense, should be ventilated and light, and the humidity should not be too high. 2. In autumn and winter, the leaves are removed, the diseased plants are cut off, and the plants are burned intensively. 3. Apply less nitrogen fertilizer and apply more phosphorus and potassium fertilizer. 4. When the disease occurs, it can spray 20% of the powder rusting 1000 times solution, and then use the medicine according to the condition.
Rust plague rust began to develop in May, irregular brown spots appeared on the leaves, yellow-brown small particles appeared on the back of the leaves, and rose rust occurred when the rose contains sputum, and yellow spots appeared on the front of the leaves.
Control methods: 1. Timely and thorough removal of diseased plants and diseased bodies, concentrated burning. 2. The planting area should be well drained. 3. After germination, spray 15% powder rusting wettable powder 800 times liquid for prevention and treatment.
The main hazard of scale insects in the seasons of Chinese worm, red leaf plum, sea paulownia, privet, and boxwood is from March to May. The eggs are over-summer or wintering in the soil around the roots of the parasitic plants. Some also do not have trees and are harmful to underground stems and roots.
Control methods: 1. At the end of winter and early spring, scrape the old skin at the base of the trunk and apply shellac with a width of about 10 cm to prevent the nymph from getting on the tree. 2. In the nymph hatching period for chemical control, you can use Aketai 10000 times liquid spray. 3. Protect and utilize superior natural enemies such as ladybugs.
Aphid rose, hibiscus, bauhinia, chrysanthemum, etc. are all vulnerable to aphids. The hazard period begins in March, with the cockroaches and nymphs overwintering on the buds of the host stems or on the back of the leaves. As the temperature rises, After the occurrence of mites, due to rapid reproduction and rapid spread, it is necessary to prevent and control in time.
Control methods: 1. Protect the use of natural enemies. Ladybugs, grasshoppers, spiders, etc. 2. Use a plant-based agent that is safe for flowers and plants and has few side effects, such as 25% squid 600-800 times or 300 times washing powder. 3. Spray 10% imidacloprid 2000~2500 times solution or Aketai 10000 times.
Source: Agricultural Network
Control methods: 1. Before planting, choose a nursery with higher topography, better drainage, loose, disease-free or mild disease. 2. Use formalin fumigation, add 30 to 27kg of water per 360 square meters of seedbed with 360ml of liquid medicine, spray the liquid evenly, then cover with plastic film tightly, after a week, uncover the film, loosen the soil, and let the medicine fully evaporate. Sowing two weeks later. 3. At the onset of the disease, the base of the seedlings is sprayed with a solution of 70% thiophanate-methyl WP 1000 times, or it can be mixed with grass ash (8:2) and sprinkled on the base of the seedlings.
Powdery mildew is common with morning glory powdery mildew, purple powdery mildew, and cineraria powdery mildew. The condition is almost the same. White mildew spots appear on the leaves at the initial onset, and then rapidly expand and connect with each other to form a large white mold layer. Severely, the diseased plants will be deformed and dwarfed, and some will not bloom normally, and the leaves will turn yellow and die.
Control methods: 1. Plants should not be too dense, should be ventilated and light, and the humidity should not be too high. 2. In autumn and winter, the leaves are removed, the diseased plants are cut off, and the plants are burned intensively. 3. Apply less nitrogen fertilizer and apply more phosphorus and potassium fertilizer. 4. When the disease occurs, it can spray 20% of the powder rusting 1000 times solution, and then use the medicine according to the condition.
Rust plague rust began to develop in May, irregular brown spots appeared on the leaves, yellow-brown small particles appeared on the back of the leaves, and rose rust occurred when the rose contains sputum, and yellow spots appeared on the front of the leaves.
Control methods: 1. Timely and thorough removal of diseased plants and diseased bodies, concentrated burning. 2. The planting area should be well drained. 3. After germination, spray 15% powder rusting wettable powder 800 times liquid for prevention and treatment.
The main hazard of scale insects in the seasons of Chinese worm, red leaf plum, sea paulownia, privet, and boxwood is from March to May. The eggs are over-summer or wintering in the soil around the roots of the parasitic plants. Some also do not have trees and are harmful to underground stems and roots.
Control methods: 1. At the end of winter and early spring, scrape the old skin at the base of the trunk and apply shellac with a width of about 10 cm to prevent the nymph from getting on the tree. 2. In the nymph hatching period for chemical control, you can use Aketai 10000 times liquid spray. 3. Protect and utilize superior natural enemies such as ladybugs.
Aphid rose, hibiscus, bauhinia, chrysanthemum, etc. are all vulnerable to aphids. The hazard period begins in March, with the cockroaches and nymphs overwintering on the buds of the host stems or on the back of the leaves. As the temperature rises, After the occurrence of mites, due to rapid reproduction and rapid spread, it is necessary to prevent and control in time.
Control methods: 1. Protect the use of natural enemies. Ladybugs, grasshoppers, spiders, etc. 2. Use a plant-based agent that is safe for flowers and plants and has few side effects, such as 25% squid 600-800 times or 300 times washing powder. 3. Spray 10% imidacloprid 2000~2500 times solution or Aketai 10000 times.
Source: Agricultural Network
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