Why do vegetables have a white powder?

Vegetables have a white powder, and it is the vegetables that have powdery mildew.

Powdery mildew is a common bacterium when we usually plant vegetables on the balcony, and if we don't maintain it properly or if the weather and environment are not suitable, these vegetables and fruits on the balcony may be infected.

Powdery mildew is caused by a fungus, and the reason why we can see this resemblance to powdery mildew is because it is an exophytic disease that is epiphytic to the foliar surface of the plant and does not erode into the foliar surface of the plant. Therefore, when powdery mildew begins to sprout and grow slowly, it will form little spots on the leaves, although it will not invade the leaf surface, but it will still absorb the nutrients and water of the leaves, and the leaves will appear yellow, white and even gray, which has a very bad impact on the growth of the whole plant.

Therefore, once we see the leaves infected with powdery mildew, we must deal with them in time.

In general, powdery mildew is difficult to grow in a dry environment, but it is easy to grow in some humid places.

After all, powdery mildew is also a kind of fungus, and we all know that creeping fungi are commonly known as long hairs, and they are generally more likely to be produced in the humid summer of summer, so we should pay special attention in this humid season.

If you have already found powdery mildew in your plant, you should pay attention to what stage of growth the plant is in when maintaining it.

Because mild powdery mildew does not cause a very serious disease to the plant itself, if it is a small amount of powdery mildew when it is about to be harvested, then you don't need to worry about it.

At this time, only the more seriously infected leaves can be picked and destroyed, and the whole plant can be directly uprooted and destroyed after harvesting, and the soil should be thoroughly disinfected.

If you are not sure, you can use a clean paper towel dipped in a little carbendazim.

The solution is gently rubbed on the leaves, and the soil is watered with carbendazim solution.

If a relatively small, growing plant has powdery mildew, then you should pay more attention to it, because if it is not handled properly, it may not survive the day of harvest

Immediately prepare some carbendazim solution and put it in a watering can, spray and wipe carefully between the leaves and the soil, remove and destroy all the infected leaves, avoid expanding the infection, and move to a place with low humidity in time.

The reason why vegetables have a white powder when they are placed in the refrigerator may be due to the condensation that is produced during the refrigeration process, and then the minerals in the condensate are dissolved in the water and form a white powder on the surface of the vegetables through water vapor. This phenomenon usually occurs on the bucket feast of vegetables or on the contact surface between vegetables. When the temperature rises, these minerals crystallize to form a white substance.

In addition, vegetables themselves also contain certain bacteria and microorganisms, which will grow and multiply during refrigeration if not properly treated during refrigeration, resulting in white powder on the surface or leaves of the vegetable residue. If this is the case, it is recommended to take the vegetables out of the refrigerator for washing, and use a paper towel to dry the surface moisture before putting them back in the refrigerator to avoid the moisture from re-generating condensation when refrigerating, thereby reducing the formation of white powder. At the same time, keeping the inside of the refrigerator dry before storing vegetables can also reduce the production of white powder.

The blue powder on greens is usually a pesticide residue, that is, the residue of a fungicide solution or an insecticidal granule. Because all kinds of pests and diseases often occur in the growth process of crops, farmers will use corresponding pesticides to repel insects in order to ensure the later yield and avoid the harm of pests and diseases, and the blue powder is the traces left by pesticides on vegetables. <

The blue powder on greens is usually a pesticide residue, that is, the residue of a fungicide solution or an insecticidal granule. Because all kinds of pests and diseases often occur in the growth process of crops, farmers will use corresponding pesticides to repel insects in order to ensure the later yield and avoid the harm of pests and diseases, and the blue powder is the traces left by pesticides on vegetables.

Ms. Wu from District 1 called this newspaper** and said that the roots of the 70 Chinese cabbages bought by her family had turned pink, and the family did not dare to eat them. Downstairs at Ms. Wu's house, the reporter saw 70 cabbages being placed in two rows, with the roots facing outward, and the roots of each cabbage extending to the cabbage gang have different areas of pink and purple, and the skin was scratched, and the inside did not change color. "I bought it for 8 cents on October 5th, and then put it in the open space downstairs, because I was afraid of uneven ventilation, and I went over to turn them over a few days ago.

This morning, I found that each cabbage had different degrees of discoloration, and I originally planned to take it back to pickle the sauerkraut, but now I don't dare to get it. ”

During the interview, the reporter saw a lot of Chinese cabbage hoarded downstairs in the community, and some citizens also reported that the cabbage they bought had the same situation as Ms. Wu's house, but only a few of them. "The neighbors bought 10 trees and all changed color early and dug up, but they still pickled the sauerkraut, and I found that the discolored parts were all in the sunshine, and I don't know if it was a pesticide reflection. In response to the discoloration of Ms. Wu's cabbage, the reporter called Wang Cong, who taught the vegetable class of Bishop Lu He, College of Agriculture of Inner Mongolia University for Nationalities.

Teacher, Mr. Wang said: "During the growing period, the cabbage gang is in the lower part, which is different from the light received by the flat after picking, and the light and temperature will be the cause of the cabbage gang's discoloration, which has nothing to do with pesticides and can be eaten." After the reporter fed back this information to Ms. Wu, Ms. Wu said that this hanging heart can finally be put down.

This should be the color after environmental pollution

Water spinach white rust, the lesions are born on the back of the leaves, the front of the leaves initially appear light yellow to yellow spots, and then gradually brown, the lesions expand, the back of the leaves produce white raised blisters, nearly round or oval to irregularly shaped, sometimes healed into larger blisters, and the later blisters rupture and scatter white incompetent sporangia. When the leaves are seriously damaged, the lesions are dense, the diseased leaves are deformed, and the leaves fall off.

3. Prevention and control methods.

Choose disease-free seeds or seed dressing with seed weight of manganese and zinc.

The disease is only limited to the infection of spindle vegetables, after 2-3 years of crop rotation, the disease prevention effect is good.

Pay attention to the drainage of stains in the field, and the ventilation of the plants.

In the early stage of the disease, spray 48% methalene-zinc wettable powder, 40% methalene copper wettable powder, or 64% alum wettable powder 600 times, Pukri water 800 times liquid, once every 7-10 days, 2-3 times of continuous treatment.