How to control the latest pepper powdery mildew?

Pepper powdery mildew is mainly harmful to leaves, old or young leaves can be killed, the pathogen is powdery mildew in Tatar, in the vegetative growth stage, the hyphae are hidden in the leaves, wait until the production of reproduction, so it is often difficult to detect in the early stage, and once found that it is difficult to use drugs to control it, let's take a look at how to control pepper powdery mildew!

Symptoms of pepper powdery mildew

Pepper powdery mildew is mainly harmful to the leaves. At first, round powdery mildew spots grow on the front or back of the leaves, which gradually expand and soon become one. In the later stage of the disease, the whole leaf was covered with white powder, and then became grayish white. Relatively speaking, the disease on the back of the leaf was more serious. The back of pepper powdery mildew produces white powdery matter rather than mildew layer, and the disease spot is densely spread, and the whole leaf turns yellow and falls off seriously, which seriously affects the yield and quality of pepper.

Occurrence regularity of pepper powdery mildew

The pathogen overwintered on the surface with diseased leaves in closed cysts. After overwintering, a split robe is produced and spread by airflow. Generally speaking, the disease is more in the middle and later period of growth, and it is easy to be popular in the open field when the weather is dry from mid-August to early September. The pathogen takes more than 20 hours from spore germination to invasion, so the disease develops rapidly and often spreads in a short time. All the bacteria could move at 10: 30 ℃, and the optimum temperature was 20: 25 ℃. The onset of the disease is quick when the relative humidity is 45-75%, and can also be caused by conidia germination when the relative humidity is less than 25%. When the relative humidity exceeds 95%, the disease is significantly inhibited.

How to prevent and cure pepper powdery mildew?

The main results are as follows: 1. Resistant varieties can be selected for agricultural control of pepper powdery mildew, planting with high topography, good ventilation and drainage, increasing phosphorus and potassium fertilizer, and avoiding too much nitrogen fertilizer in pepper growing period.

2. In the early stage of the disease, medicaments can be used to prevent and cure the disease. the medicament can be sprayed with 25% ethoxylate 1000 times, or 30% ether fungus ester 1000-1500 times, or 47% plus Ruinong wettable powder. Spray once every 7 to 10 days, 2 times in a row.

3. When the disease is serious, 50% chlorobromoisocyanuric acid mixed fluorosilazole spray combined with ethoxyl-azoxystrobin aerosol fumigation shed, the effect is very good. In order to improve the control effect, attention should be paid to the details such as spraying time, agent selection, reasonable water use and so on.