Control measures of Diseases and insect pests of Sweet Pepper

Sweet pepper is one of the vegetables planted in a large area in China, which is threatened by a variety of diseases and insect pests in the process of planting. Improper control will lead to the decline of the quality and yield of sweet pepper. So what are the diseases and insect pests of sweet pepper? the following editor will bring you a summary of common sweet pepper pest control techniques as follows. Let's take a look.

1. Leaf spot

The leaves that mainly harm sweet pepper are yellow-green irregular water-immersed spots at the initial stage of the disease, which are enlarged to reddish brown or dark green, with different sizes, and most of them are reddish brown when dry. Once infected, the expansion rate is very fast. A single leaf or most of the leaves, the plant can still grow, serious will cause defoliation. The disease is generally caused by the pathogen overwintering on seeds and remnants, and then spread by wind and rain, invading from the wound, continuous cropping and cruciferous market, and it is easy to spread in high temperature and rainy season.

Prevention and control methods: reasonable crop rotation, high border cultivation, timely drainage after rain, so as to avoid flooding, disinfection of seeds by chemical dressing during sowing, thorough clearing of fields after harvest, removal of diseased bodies, and deep ploughing. Streptomycin sulfate can be sprayed at the initial stage of the disease, once every 7-10 days, 2-3 times in a row.

2. Epidemic disease

At the seedling stage, the base of the infected stem will appear dark green waterlogged soft rot symptoms near the ground, and then collapse or die; when the adult plant occurs, dark green waterlogged disease spots appear on the leaves, and large chunks of soft rot appear on the enlarged leaves. The branches and leaves above the diseased part will soon wither and die; when the root is sick, the diseased part of the stem will circle around the stem. The disease is caused by the fungus Phytophthora capsici, which overwinters in the disease remnant bowl and soil and spreads through wind and rain, water drop splash and so on.

Prevention and control methods: the occurrence of the disease is closely related to temperature, precipitation and watering. Watering times and amount of watering should be controlled to avoid stagnant water in the field. When the ground temperature is too high, it should not be watered as far as possible, and should be drained in time after rain. In the early stage of the disease, it can be sprayed with pyrethromycete, and when the disease is serious, it can be sprayed with ethyl phosphorus and aluminum.

3. Soft rot

Soft rot mainly harms the fruit, the fruit appears water-stained dark green disease spot at the initial stage of the disease, and then the fruit turns brown and rotten until all rotten, and the diseased fruit often falls off or hangs on the branches and turns white after drying up. The bacteria are bacterial bacteria, which are spread by wind, rain and irrigation in the soil over the winter and next year, invade from the wound when the conditions are suitable, and spread through cotton bollworm, tobacco green worm and wind and rain after infection, and are easy to spread in rainy days and high humidity.

Control methods: reasonable close planting, timely planting, cultivation of strong seedlings, timely drainage in rainy season, not timely, strengthen ventilation, reduce humidity, and control fruit borer pests such as Helicoverpa armigera and tobacco pests. Streptomycin sulfate, streptomycin sulfate and chlortezole can be used to prevent and cure the disease, sprayed every 7-10 days for 2-3 times.

4. Ground tiger

Generally, about a week after the planting of sweet pepper, stir-fry the corn flour, mix it well with 50% phoxim or insecticides such as phoxim, and sprinkle it evenly on the surface of the pepper field in the evening, using 1-2 kg per mu. Control aphids once a week for 2-3 times in a row, but also effective aphids.

The above is the introduction of sweet pepper pest control measures, hope to help you, want to know more related knowledge, please pay attention to us.