Common pest and disease control methods for spring flowers

Control of common pests and diseases of spring flowers

Spring flowers suffer from many pests and diseases. In April and May, the more serious ones include the following: Aphids (nìchóng). Hibiscus syriacus, ornamental peach, Chinese hibiscus, Chinese rose, and Japanese honeysuckle are all easily harmed by aphids. As the temperature rises, they increase and become more serious day by day. They must be discovered and controlled early.

Control methods: 1. Spray 40% omethoate or 50% phosmet, diluted with water at 1200-1500 times; 2. For a small number of potted flowers, you can also spray 70-100 times neutral laundry detergent

Red spider mites. The red spider mites on many flowers such as jasmine, Chinese hibiscus, asparagus fern, Chinese rose, and dahlia mostly begin to cause damage from early April. Control methods: For a small number of potted flowers, you can often rinse the front and back of leaves with tap water, or spray or dip with boiled and cooled 100-150 times flour paste water, then rinse once more with clean water after a day or two, which can achieve obvious results.

Scale insects (flower lice). The scale insects on white magnolia, Chinese rose, boxwood, and Pittosporum tobira mostly begin to hatch and become active from mid-April to mid-to-late May.

Control methods: 1. Before hatching, gently brush off the insects by hand; 2. Check frequently, and during the nymph hatching period spray a Kuangshajie 1000—1500 times solution.

Damping-off. When the temperature is in the 20s Celsius, newly sown flowers or flowers sown last autumn, tree seedlings, and some flowers prone to root rot are highly susceptible to damping-off if soil moisture is high. Control methods: 1. Before sowing, use 70% quintozene 3-8 jin per mu of soil, evenly mixed into the soil; 2. Control watering during the tender seedling stage, and do not let the soil become too wet; 3. When diseased seedlings are first found, pour on 1% ferrous sulfate or a 200-400 times 50% amobam solution, each applying 4-8 jin of solution per sq m.

Rust disease. Begonia rust is easily infects in large amounts after rain in April and May; rose rust infects when rose buds are about to open. Control methods: 1. When the rose disease occurs at sprouting, promptly remove and burn the yellow diseased buds that sprout first, to eliminate the source of infection; 2. During the initial infection period, spray 15% triadimefon, diluted with water at 700-1000 times, with obvious effect.

Powdery mildew. Chinese rose powdery mildew, garden balsam powdery mildew, and smoke tree powdery mildew mostly infect in May and June, and in summer easily cause symptoms such as yellow leaves, withered leaves, and curved tender shoots. Control methods: 1. Pay attention to ventilation and light transmission for the flowers; 2. Apply less nitrogen fertilizer and more phosphorus and potassium fertilizer; 3. Spray once with a 15% triadimefon 700-1000 times solution at the initial infection stage.

Control methods for common pests and diseases of spring flowers

        Spring flowers suffer from many pests and diseases. In April and May, the more serious ones include the following: Aphids (nìchóng). Hibiscus syriacus, ornamental peach, Chinese hibiscus, Chinese rose, and Japanese honeysuckle are all easily harmed by aphids. As the temperature rises, they increase and become more serious day by day. They must be discovered and controlled early.

       Control methods: 1. Spray 40% omethoate or 50% phosmet, diluted with water at 1200-1500 times; 2. For a small number of potted flowers, you can also spray 70-100 times neutral laundry detergent

       Red spider mites. The red spider mites on many flowers such as jasmine, Chinese hibiscus, asparagus fern, Chinese rose, and dahlia mostly begin to cause damage from early April. Control methods: For a small number of potted flowers, you can often rinse the front and back of leaves with tap water, or spray or dip with boiled and cooled 100-150 times flour paste water, then rinse once more with clean water after a day or two, which can achieve obvious results.

       Scale insects (flower lice). The scale insects on white magnolia, Chinese rose, boxwood, and Pittosporum tobira mostly begin to hatch and become active from mid-April to mid-to-late May.

       Control methods: 1. Before hatching, gently brush off the insects by hand; 2. Check frequently, and during the nymph hatching period spray a Kuangshajie 1000—1500 times solution.

       Damping-off. When the temperature is in the 20s Celsius, newly sown flowers or flowers sown last autumn, tree seedlings, and some flowers prone to root rot are highly susceptible to damping-off if soil moisture is high. Control methods: 1. Before sowing, use 70% quintozene 3-8 jin per mu of soil, evenly mixed into the soil; 2. Control watering during the tender seedling stage, and do not let the soil become too wet; 3. When diseased seedlings are first found, pour on 1% ferrous sulfate or a 200-400 times 50% amobam solution, each applying 4-8 jin of solution per sq m.

       Rust disease. Begonia rust is easily infects in large amounts after rain in April and May; rose rust infects when rose buds are about to open. Control methods: 1. When the rose disease occurs at sprouting, promptly remove and burn the yellow diseased buds that sprout first, to eliminate the source of infection; 2. During the initial infection period, spray 15% triadimefon, diluted with water at 700-1000 times, with obvious effect.

       Powdery mildew. Chinese rose powdery mildew, garden balsam powdery mildew, and smoke tree powdery mildew mostly infect in May and June, and in summer easily cause symptoms such as yellow leaves, withered leaves, and curved tender shoots. Control methods: 1. Pay attention to ventilation and light transmission for the flowers; 2. Apply less nitrogen fertilizer and more phosphorus and potassium fertilizer; 3. Spray once with a 15% triadimefon 700-1000 times solution at the initial infection stage.