High incidence of anthracnose leads to reduced yield of chili how to prevent anthracnose of hot pepper

Anthracnose of pepper is more common, mainly causing mature pepper and old leaves. In addition, it can also harm eggplant and tomato. The environment of high temperature and humidity in protected cultivation is conducive to the occurrence and spread of anthracnose. When the disease is serious, the yield of hot pepper can be reduced by 20% and 30%.

Anthracnose of pepper

I. symptoms of the disease:

In the early stage of the disease of hot pepper, there are watery round or irregular disease spots, grayish brown in the center, and then sunken, with small black spots with raised concentric wheels. When dry, the disease spot shrinks, like parchment paper, easy to break; when wet, the reddish sticky material overflows from the disease spot. The damaged leaves were chlorotic water-stained spots at first, dark brown on the back edge, gray-white in the center, small black spots on the disease spots, and the diseased leaves were easy to dry up and fall off. Pepper stems and fruit stalks infected with disease, irregular brown spots, slightly sunken, easy to crack when dry.

Second, prevention and control methods:

1. Seed disinfection: leave seeds from disease-free fields or disease-free pepper plants. before raising seedlings, seeds need to be sterilized. The seeds can be soaked in 55 ℃ lukewarm water and sowed. Pepper seeds can also be immersed in cold water for 6-10 hours, then soaked in 1% copper sulfate solution for 5 minutes, removed, washed in 1% soapy water for 5 minutes, washed with clean water, and then germinated and sown.

two。 Implement crop rotation: avoid continuous cropping with tomato, eggplant and other crops.

3. Strengthen pepper seedling stage and field management: use nutrition bowl to raise seedlings to protect root system and prevent germs from invading by pepper wound. Reasonable close planting, control suitable temperature and humidity. Increase the application of manure, rational application of phosphorus and potassium fertilizer to improve the disease resistance of pepper plants. During the result period, foliar topdressing can be done with 0.2% potassium dihydrogen phosphate or 0.2% potassium dihydrogen phosphate plus 0.5% urea. Diseased leaves and fruits should be removed in time and buried or burned.

4. Chemical control: spray Bordeaux solution or 0.3% copper sulfate solution at the fruiting stage of pepper to prevent the disease. At the initial stage of the disease, you can choose 75% chlorothalonil wettable powder 500-600 times, or 50% carbendazim 600-800 times, or 70% methyl topiramate wettable powder 1000 times, or 50% thiram wettable powder 500 times, or 65% Dysen zinc 500 times, spray once in 5-7 days, 2-3 times in a row. If the pepper is sprayed with 0.2% potassium dihydrogen phosphate and 1% soapy water after planting, once every 7-10 days for 2-3 times, it is also good for the prevention and control of anthracnose.