The temperature in spring is still warm and cold. The pests and diseases that harm flowers during the period are as follows:
ã€aphid】
Hibiscus, blue peach, rose, honeysuckle, etc. are all vulnerable to aphids. As temperatures rise, locusts are also increasing.
Control methods: spraying with imidacloprid, acetamiprid, can add a very small amount of detergent to enhance efficacy.
Red spider
For jasmine, asparagus, rose, dahlia, etc. from the beginning of April began to harm.
Control methods: Use peony and avermectin to control.
ã€Coccinea】
Most of the scale insects on Magnolia, Rose, Cyclovirobuxine, and Lagerstroemia incubate from mid-April to mid-to-late May.
Control methods: 1, artificially gently brush off the body before hatching. 2. Spray chlorpyrifos and beta-cyfluthrin during the larval hatching period.
Blight
When the temperature reaches 20°C, the newly sown flowers, saplings, and some easily rotted flowers are prone to blight when soil moisture is high.
Control methods: 1. Seed-dressing agents used for flower seeding before sowing. 2, control the watering in the seedling stage, do not make the soil too wet. 3. At the beginning of illness, water 1% ferrous sulfate or mancozebite.
Rust
Rose rust is infringed when the rose is in its infestation.
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% Triadin 700-1000 times in the initial infringement period.
ã€powdery mildew】
Rose powdery mildew and impatiens powdery mildew mostly occur from May to June, and early summer can easily cause symptoms such as yellow leaves, dead leaves, and tender shoots.
Control methods: 1, pay attention to the flowers ventilation. 2, less nitrogen fertilizer, apply more phosphorus and potassium fertilizer. 3, the initial dyeing period spray 15% triadimefon 700-1000 times can be.
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