Control of Common Diseases of Flowers in Spring

With the rise of temperature in spring, many insect pests begin to ravage, so today the editor will share with you the prevention and control of common diseases of flowers in spring.

There are common diseases and insect pests in flowers in spring, the temperature in spring is warm and cold, and the air humidity is high. At present, the occurrence of crop diseases and insect pests is moderately serious, and there are also many diseases and insect pests in flowers. Generally speaking, there are the following serious hazards from April to May:

Aphid hibiscus, green peach, mulberry, rose, honeysuckle and so on are vulnerable to aphids. With the rise of temperature, aphids are also increasing. Control method: 1.40% omethoate or more or 50% imidophos is sprayed 1200-1500 times the water. two。 A small amount of potted flowers can also be sprayed with 70-100 times neutral laundry powder.

The harm of red spider to jasmine, Fusang, asparagus, rose, dahlia and so on began in early April.

Prevention and control methods: 1. Can spray speed culling 1000 times liquid. two。 A small amount of potted flowers often rinse the front and back of the leaves with tap water, or spray or dip in 100-150 times of batter water that has been boiled and cooled, and rinse again with clean water in a day or two, you can get obvious results.

Scale insects (flower lice) most of the scale insects on Magnolia, rose, yellow poplar and Haitong began to hatch from mid-April to mid-May.

Prevention and control methods: 1. Gently brush off the worm body manually before hatching. two。 1000-1500 times of omethoate was sprayed during larval incubation.

When the temperature reaches 20 ℃, newly sown flowers, saplings and some flowers with rotten roots are very prone to bacterial blight when the soil moisture is high.

Prevention and control methods: 1. Before sowing, each seedling was evenly mixed with 70% pentachloronitrobenzene 1.5-4kg. two。 Control watering at the seedling stage so as not to make the soil too wet. 3. At the beginning of the disease, irrigate 1% ferrous sulfate or 200-400 times 50% Dysenamine solution, and 2-4kg solution per square meter.

Rose rust infects roses when they are in bud.

Prevention and control methods: 1. When the rose sprouts, the first yellow bud should be removed and burned in time to eliminate the source of infectious disease. two。 Spray 15% of strychnine 700Mel 1000 times in the initial invasion period.

Chinese rose powdery mildew and impatiens powdery mildew mostly occur from May to June, which are easy to cause yellow leaves, withered leaves, tender shoot bending and other symptoms in summer.

Prevention and control methods: 1. Pay attention to the ventilation and light of the flowers. two。 Apply less nitrogen fertilizer and more phosphorus and potassium fertilizer. 3. Spray 15% trimethoprim 700-1000 times at the initial dyeing stage.