Detailed Explanation of the Latest Control Measures for Sweet Pepper Pests and Diseases

Sweet pepper is one of the vegetables planted on a large scale in our country. During the planting process, it faces the threat of various pests and diseases, and improper control will cause a decline in the quality and yield of sweet pepper. So what pests and diseases harm sweet pepper? Below, the editor brings you a summary of common sweet pepper pest and disease control techniques as follows. Let's take a look together.

1. Leaf spot disease

It mainly harms the leaves of sweet pepper. In the early stage of the disease, yellow-green irregular water-soaked lesions appear, which expand into red-brown or dark green lesions. The lesion sizes vary. When dry, the lesions are mostly red-brown. Once infected, they expand extremely quickly. If individual leaves or most leaves of a plant are affected, the plant can still grow, but in severe cases it will cause defoliation. This disease generally occurs when the pathogen overwinters on seeds and diseased plant residues, then spreads through wind and rain, and invades through wounds. Continuous cropping and continuous cropping with cruciferous crops lead to more severe disease incidence, and it is very easy to spread in high-temperature and rainy seasons.

Control methods: Reasonable crop rotation, use high-ridge cultivation, drain promptly after rain to avoid flood irrigation, treat seeds with fungicide dressing for disinfection before sowing, thoroughly clean the field after harvest, remove diseased plant residues, and carry out deep plowing. In the early stage of the disease, streptomycin sulfate can be sprayed for control, once every 7-10 days, for 2-3 consecutive times.

2. Phytophthora blight

When infected at the seedling stage, dark green water-soaked soft rot symptoms appear on the stem base near the ground, followed by damping-off or sudden wilt and death; when adult plants are affected, dark green water-soaked lesions appear on the leaves, then expand and cause large areas of soft rot on the leaves, and the branches and leaves above the diseased part quickly wither and die; when the roots are affected, the diseased part at the stem base will encircle the stem. This disease is caused by the fungus Phytophthora capsici. The pathogen overwinters in diseased plant residues and soil, spreads through wind and rain, splashing water droplets, and other pathways, and the diseased part produces pathogens, which can cause multiple infections.

Control methods: The occurrence of this disease is closely related to temperature, rainfall, and watering. The number of waterings and the amount of water should be controlled to avoid water accumulation in the field. When the ground temperature is too high, try not to water, and drain promptly after rain. In the early stage of the disease, ridomil can be sprayed for control, and when the condition is more severe, phosethyl-Al can be sprayed for control.

3. Soft rot

Soft rot mainly harms the fruit. In the early stage of the disease, water-soaked dark green lesions appear on the fruit, then the fruit turns brown and rots until it is completely rotten. Diseased fruits often fall off or remain hanging on the branches, and turn white after drying. The pathogen is a bacterial pathogen. It overwinters in the soil with diseased plant residues and spreads through wind, rain, and irrigation the following year. When conditions are suitable, it invades through wounds. After infection, the pathogen spreads again through cotton bollworm, tobacco budworm, and wind and rain. It is prone to epidemics on cloudy and rainy days and when humidity is relatively high.

Control methods: Reasonable close planting, timely planting, cultivate strong seedlings, drain promptly in the rainy season, do not delay, strengthen ventilation, reduce humidity, and at the same time control fruit-boring pests such as cotton bollworm and tobacco budworm well. When the disease occurs, streptomycin sulfate, streptomycin sulfate, and yetaizuo can be used for control, sprayed once every 7-10 days, for 2-3 consecutive times.

4. Cutworm

Generally, about one week after sweet pepper planting, fry cornmeal until cooked, mix it evenly with insecticides such as 50% phoxim or decamethrin, and evenly scatter it on the surface of the pepper field in the evening, using 1-2 kg per mu. Control once every other week, for 2-3 consecutive times, and it can also effectively control aphids.

The above is an introduction to sweet pepper pest and disease control measures. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.