Spring flowers common pests and diseases

Spring flowers have more pests and diseases. In April and May, the following are more serious: Aphids (grasshoppers), hibiscus, bifoam, hibiscus, rose, and honeysuckle are all vulnerable to aphids. As temperatures rise, locusts are also increasing and must be controlled. Control methods: 1,40% of omethoate or 50% of imidophos is sprayed after 1200-1500 times of water. 2, a small amount of potted flowers can also spray 70 to 100 times the neutral detergent. Red spider Jasmine, hibiscus, asparagus, rose, dahlia, etc. began to damage from the beginning of April. Control methods: A small number of potted plants are often rinsed with tap water on the back of the leaves, or on the back, or sprayed and boiled with 100 to 150 times the batter water that has been boiled and cooled. After one or two days and then flushed with clean water, it can receive significant results. The scale insects of the scale insects (Magnolia jasminoides) Magnolia, Rose, Cyclovirobuxine, and Pittosporum were mostly hatched between mid-April and mid-May. Control methods: 1, artificially gently brush off the body before hatching. 2. Diligently check and spray 40% omethoate 1000 to 1500 times during the larval hatching period. Blight occurs when the temperature reaches 20 °C, the newly sown flowers, saplings, and some easily rotted flowers are prone to blight when humidity is high. Control methods: 1, before sowing with 70% of per-mu five-nitrochlorobenzene 1.5 to 4 kg evenly mixed in the soil. 2. Control the watering of the seedlings during the tender period and do not make the soil wet. 3. When the diseased seedlings are found at the beginning, water 1% ferrous sulfate or 200-400 times 50% Daisendamine solution, and water 2 to 4 kg of potable water per square meter. The rust estrus rust disease is prone to massive violations of flowers and trees after the April and May rains. Rose rust is infested when the roses are in bloom. Control methods: 1. When the rose germinates, it is necessary to remove the first germinating yellow disease bud in time and eliminate the source of the infectious disease. 2. Spray 15% triadimefon 700 to 1000 times in the initial infringement period. Powdery mildew rose, Impatiens balsamina and Astragalus powdery mildew mostly occur in May and June, and yellow leaves, dead leaves, and tender shoots are easily caused in summer. Control methods: 1, pay attention to the flowers ventilation. 2, less nitrogen fertilizer, apply more phosphorus and potassium fertilizer. 3, the initial period of dyeing spray 15% triadimefon 700 ~ 1000 times can be.

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