Why do apple smears have black and red dots in five or six days?

The apple smearing bag has black and red spots in five or six days, mainly because the bag has no ventilation holes, which causes the temperature inside to be too high, which is not conducive to preservation.

The apple film bag has black and red spots in five or six days, which means that the apple is beginning to appear rotten spots.

The apple modal has black and red spots in five or six days, which may mean that there is some virus in this place, so you can find the fruit doctor.

The apple film bag has been five or six days, and the black and red dots should be five, and it would be better to breathe a little.

Why did the apple have black spots for five or six days, this is that you cover it, and this kind of moldy situation appears.

This may not have been well maintained, and her figure would have done this.

Well, it's not big about this apple, it got up in five or six days, and after the black dots black dots black dots got it out, it depends on the situation to know what it is.

After picking the apples, pyraclostranium resin, tebuconazole and thiophanate-methyl suspensions can be used, and chelated calcium fertilizers with high calcium content and easy absorption can be added. The reason why it is necessary to spray apples after picking bags is because the peel of apples after picking bags is more delicate, and the resistance to various pests and diseases is low, and the probability of infection with black and red spot disease becomes greater.

1. Spray the formula after picking the bag of apples

1. What kind of medicine should be injected after picking the apples?

After picking the bag of apples, the apples can be given pyraclostraneth resin, tebuconazole and thiophanate-methyl suspension, and add chelated calcium fertilizer with high calcium content and easy to be absorbed, which can effectively prevent and control apple fruit cracking disease and bitter pox.

2. Why do you need to spray apples after picking the bag?

Because apples are picked in bags, the peel is more delicate, and the resistance to various pests and diseases is low, and the probability of infection with black and red spot disease is greater. Therefore, 2-3 days after the apple bag is picked, the whole garden should be sprayed with a fungicide to prevent and control the small red dot fungus. It should be noted that the use of powders should be avoided as much as possible to avoid contaminating the fruit surface and affecting the coloring of apples.

2. What to do if there are black and red dots after picking the apples

1. How to solve the appearance of red and black dots.

After picking the bag, the apples appeared black and red spots, mainly suffering from apple spot defoliation, and polyantimycin 800 times could be sprayed; or 10% Polyann 1000 times solution; There are also 80% spray grams of 800 times the liquid.

2. It is not suitable for the time to pick the apple bag.

1) In rainy days or dewy weather, it is not suitable to pick apples, and in windy or rainy weather, it is not suitable to pick apples. If the apples are picked in these weather, it will not only affect the surface of the apples, but also increase the chance of disease.

2) Between 11 noon and 3 pm, try not to pick apples, because the temperature difference between the front and back is too large, and sunburn will occur.

3. Why do red and black dots appear after picking the bag?

Generally, red and black spots appear after picking the bag for apples, mostly because the farmers do not use the medicine in time and choose the fruit bag with fewer air holes after flowering to before bagging, and after bagging the apples, the temperature and humidity in the bag are larger, which gives the conditions for the growth of germs, so after the apple is picked in the bag, red and black spots will appear.

Black spot disease is a disease peculiar to bagged apples. The main pathogenic bacteria of the black spot type diseased fruit is Glocrospora pinkensis, the black spots are mostly concentrated in the calyx depression and calyx shoulder, the size is mostly L-3 mm, and the lesions are cracked and white membranous pectin.

According to the investigation, the calyx, columella, filament, pollen and other flower residues on the young fruit after flowering may be its main host. Under the premise of poor ventilation of the fruit bag, poor moisture drainage and ineffective medication before bagging, the parasitic bacteria on the flower residue invaded the fruit through the stomata, skin hole and wound, and the skin hole changed color in the early stage of the disease, and black-brown dots appeared on the fruit surface, which mostly occurred in the calyx depression and the top of the fruit.

After years of large-scale test demonstration before bagging, use "20% Echo 2000 times + 70% thiophanate-methyl 800 times" fine spray to ensure that a fruit does not leak, it can effectively keep the black spot disease out of the bag and ensure that the fruit is sterile into the bag. At the same time, it should be noted that the bagging operation should be done:

The bag body is bulging, the upper mouth is tightly sealed, and the lower hole is open. When the film bag is first put on and then the paper bag, two seams or two vertical cuts are cut horizontally or vertically at the corners of the lower corners of the bag before the film bag is covered, which can effectively improve the air permeability of the film bag.

Original work Plagiarism must be investigated by Wei Lixin.

Red spot disease is caused by the spotted defoliation bacterium (Cephalospora aprosporus). The disease only infects the leaves on the unbagged fruits, and not only the leaves on the bagged apples, but also infects the young and tender fruit surfaces that have just been picked from the bags. Red spot disease is an indirect infection of the bagged fruit, 3-4 days after the paper bag fruit is taken off the bag in the previous drought and waterlogging years, it is easy to produce small cracks in the skin pores in rainy weather such as rain, fog, dew, etc., and the pathogen is infected with the small cracks, the lesions are distributed on the fruit surface and the shoulder, and the coloring is synchronized with the red spots with large needle tips on the fruit surface, generally 3-5 mm brown to black-brown round spots, with light red or dark green halos around the periphery, slightly concave, and some have small holes, cracks or white colloids.

The lesions do not penetrate deep into the pulp and do not rot and spread. The outer part of the crown is heavier than the inner chamber, the upper part is more than the lower part, and the sunny side of the fruit is heavier than the negative side.

Prevention and control measures: Water in time in case of high temperature and drought weather during the fruit growth period to ensure the soil moisture balance of the orchard**, so that the peel and pulp cells grow and develop synchronously, and reduce the proportion of fruit cracks. Before bag picking, spray 3% polyantimycin 600 times + 70% thiophanate-methyl 800 times.

After taking off the bag, 20% Echo 2000 times + oligosaccharide calcium 1000 times can be sprayed to eradicate spotted defoliant pathogenic bacteria. Avoid picking up the bag with dew in rainy days, the three-color double-layer bag can be picked up first, and the inner red bag can be picked up after 3-5 sunny days. After the outer bag is removed, if it rains, it can be postponed backwards, and the inner bag can be removed after the weather is fine.

Apple black spot disease! Prevent in advance and strengthen field management.

1. After flowering to before bagging, spray 80% mancozeb powder 800 times or 10% polyantimycin 1500 times every 7 days, and spray 3 5 times in a row for sterilization prevention.

2. Fruit bags have a great relationship with the severity of the disease. The paper bag must be of moderate thickness, soft and tough, good air permeability, strong shading, no water seepage, can withstand wind and rain, the edge is tightly glued, the wax is good and the wax is evenly coated, water resistant, and does not dissolve under high temperature and sun.

3. Early bagging can make young fruits less affected by sunburn and adverse external climate, and enhance their ability to resist stress. The film bag should be 15 to 20 days after flowering; Paper bags are better for 25-35 days; If the film bag is added to the paper bag, the paper bag should be put on 15 to 25 days after the film bag.

4. Do a good job of pruning, especially the thinning of summer pruning, so that the thickness of the leaf curtain layer is appropriate, and the ventilation and light transmission are improved; Nitrogen fertilizer should be applied less and more intensively from the middle stage of growth to avoid nitrogen, phosphorus and potassium imbalance and aggravate calcium and boron deficiency; Drain the water during the rainy season to reduce soil moisture content and air humidity.

5. After each rain, check the bag in time to remove the water in the bag and facilitate ventilation; If the bag is drenched by rain and pasted on the fruit surface, remove it in time and put on a new bag.