Spring flowers common pests

The pathogen of blight is Rhizoctonia solani, and its optimal temperature for growth is 24 to 28°C. When the temperature of the plant seedlings at 20°C is high in soil moisture, blight easily occurs. If coupled with low-lying topography, viscous soil, former crops as host plants and old seedbed soil, and incomplete use of composted compost, it will increase the incidence of disease. The symptoms are stem-based oval dark brown spots, and sometimes, Mild brown mycelium can be seen in the diseased area. Control methods: 1. Prior to sowing, choose a higher terrain, drainage is better, loose, disease-free or mildly nursery. 2. Formalin fumigation, with 360ml liquid per square meter with 9-27kg of water, evenly spray the liquid, then cover it tightly with plastic film, remove the film after one week, loosen the soil, let the drug fully evaporate, Sow after two weeks. 3. At the onset of disease, the seedling base was sprayed with a 70% thiophanate-methyl wettable powder 1000 times solution, or mixed with plant ash (8:2) and sprinkled on the seedling base. Powdery mildew is common with morning glory powdery mildew, purple powdery mildew, powdered cineraria powdery mildew, the disease is roughly the same, when the initial onset of the leaves will appear white mold, then quickly expand and connect to each other to form large white mold layer, Severely deformed and dwarfed the diseased plants, some could not normally bloom, and the leaves turned yellow and died. Control methods: 1. Plants should not be too dense, should be air and light, humidity should not be too high. 2. In the autumn and winter, the fallen leaves are removed, the diseased plants are cut off, and they are burned. 3. Less nitrogen fertilizer, more phosphorus and potassium fertilizer. 4. At the time of onset, 20% triadimefon can be sprayed 1000 times, and the drug can be developed according to the condition later. The rust rust rash disease began in May. Irregular brown lesions appeared on the leaves, and yellow-brown granules were produced on the back of the leaves. Rose rust occurred when the roses were in bloom and the leaves appeared yellow spots on the front of the leaves. Control methods: 1. Timely and complete removal of diseased plants and diseased bodies, concentrated burning. 2. The planting area should be well drained. 3. After germination, spray 15% triadimefon 800 times liquid for control. The main harm period of scale insects rose, red plum, Pittosporum sinensis, Ligustrum lucidum, and boxwood is from 3 to 5 months. The egg grows in the soil around the roots of the parasitic plants during the summer or winter, and as the temperature rises, it starts to harm the soil. Some of them are not in the trees but harm the underground stems and roots. Control methods: 1. At the end of the winter and early spring, scrape the old skin at the base of the trunk and apply a shellac about 10 cm wide to prevent the nymphs from getting on the tree. 2. In the control of nymphs during the incubation period, they can be sprayed with 80% dichlorvos 1000 times solution or 40% omethoate 1000 to 1500 times solution. 3. Protect and use predominant natural enemies such as ladybugs. The locusts rose, hibiscus, redbud, chrysanthemum, etc. are all vulnerable to locusts. The damage period starts from March. The nymphs and nymphs overwinter on the shoots of the host stems and leaves, or as the temperature rises. After the occurrence of locusts, due to rapid propagation and rapid spread, timely prevention and control must be carried out. Control methods: 1. Protect and use natural enemies. Ladybugs, grasshoppers, spiders, etc. 2. Choose a plant agent that has good safety and low side effects on flowers and plants, such as spraying 25% rattan extract 600 to 800 times liquid or washing powder 300 times liquid. 3. Spray 40% Dimethoate 1000 times or 50% Imthiophos 1000 to 1500 times.

 

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