What is the situation when the trunk of the peach tree is white ash ? How to govern it?

This is caused by scale insects and can be sprayed throughout the tree with drugs such as fungicides. After falling leaves, before the peach tree germinates, the trunk is coated with a lime-sulfur mixture to kill the scale insects hidden in the cracks in the bark and prevent large-scale development the following year.

Scale insects, mulberry white scales suck the sap of the host with nymphs and adults, the amount of insects is particularly large, some completely cover the bark, overlap each other into layers, form uneven gray-white wax substance, drain mucus to pollute the tree body in the form of oil stains, the damaged branches are underdeveloped, the heavy ones are pruned or the whole plant dies, and the 2-3-year-old branches are the most damaged.

Artificial control. During the dormant period of fruit trees, use a stiff bristle brush or wire brush to brush off overwintering females; Prune severely damaged branches.

For pesticide control, spray 5-7 Baumé stone sulfur mixture or 5% diesel emulsion before germination. During the incubation period of each generation of nymphs (mid-to-late May, early to mid-August), spray 1500 times of 48% lesben emulsifiable concentrate or 2000 times of 5% cypermethrin, or 800 times of 90% trichlorfon, and 1500 times of rapid scale killing. Adding neutral laundry detergent to the pharmacy can improve the prevention and control effect.

Summary. The white hairs growing on the branches of peach trees are the nymphs of peach tree scale insects, and peach tree white scale insects are important pests of peach trees. Female adults and nymphs damage the new shoots, branches and fruits of peach trees, causing serious weakness of the tree, greatly reducing fruit yield and variety, and even dying of the whole tree.

Prevention and control measures: prevention and control are mainly based on drug killing. It can be sprayed with 50% marathon 800-1000 times solution or 40% dimethoate 800-1000 times solution and 80% dichlorvos 1500-2000 times solution during the peak hatching period of nymphs (when a large amount of dichlorvos spreads from the inside of the mother shell to the outside); However, it is difficult to apply the pesticide after the nymphs have spread; Therefore, the medicine should be administered as soon as possible.

What is the white stuff on the trunk of the peach tree, some of the trees are dead, is this the reason? Find prevention and control methods.

The white hairs growing on the branches of peach trees are the nymphs of peach tree scale insects, and the peach tree is an important pest of peach trees. Female adults and nymphs damage the new crop tips, branches and fruits of peach trees, causing serious weakening of the tree, greatly reducing fruit yield and varieties, and even dying of the whole tree. Prevention and control measures:

The prevention and treatment is mainly based on drug killing. It can be sprayed with 50% marathon 800-1000 times solution or 40% dimethoate 800-1000 times solution and 80% dichlorvos 1500-2000 times solution during the peak hatching period of nymphs (when a large amount of dichlorvos spreads from the inside of the mother shell to the outside); However, it is difficult to apply the pesticide after the nymphs have spread; Therefore, it is advisable to apply medication and socks as soon as possible.

Treatment measures (1) Spray 1 or 2 times of Baume 5 degree stone sulfur mixture, or 100 times engine oil emulsion before germination to eliminate overwintering female adults. It is required to spray thoroughly with moisture. (2) During the growth period, before the formation of the scale shell during the occurrence period of each generation of nymphs, spray 1000 times of 50% marathon emulsion, 3000 times of 20% pyrethrin, 20% chrysanthemum 2000 times, and 1500 times of 80% dichlorvos emulsion.

Due to the long duration of the nymph hatching period, it should be sprayed once in about 7 days, and sprayed 3 times in a row. Adding dish soap to the potato and worm liquid can improve the efficacy. (3) When the insect body is densely packed, it can be removed with a stiff brush before spraying, and then spray the finger medicine to facilitate the penetration of the liquid.

4) Strengthen the quarantine of seedlings and scion to prevent spread.

In the past few days, farmers have sent ** from their peach orchards, and there are many small white spots on the branches of peach trees, and they don't know what's going on. After our identification, we found that this is a pest, called peach tree mulberry scale, which is a relatively common pest in the process of peach tree planting.

Mulberry white scale to the peach tree is more harmful, when the occurrence is serious, female adults and nymphs live on the branches to suck the sap, causing the tree to weaken, if the control is not timely, it will even cause the peach tree to die directly. So how to control the peach tree mulberry white scale? Let me give you some suggestions below.

First of all, for the mulberry white scale that appeared in this period, because the fruit has been harvested and most of the leaves have fallen, it can be combined with pruning to directly scrape the more concentrated mulberry white scale community.

10% cypermethrin. Propylene ether suspension 750 times + silicone.

30% spiroethyl ester. Propyl ether 1500 times + 20% acetamiprid water 1500 times + vegetable oil.

Spiromethane ethyl ester 2000 times + 70% acetamiprid 1500 times 25% thiamethoxam 1000 times + silicone.

20% emamectin benzoate. Pyryl ether 1500 times + 10% homeopathic cypermethrin 1500 times 20% dipyroxidin 1500 times + additives.

33% ethyl spirosteris. thiazinone 2500 times + acetamiprid, clothianidin, cypermethrin, etc. + additives.

45% chlorpyrifos 1000 times + cypermethrin + additives.

In the past, the control of scale insects was mostly used to kill phosphorus, but this ingredient has been banned. And the above formulas are all practiced, and the current effect is relatively good!

After the prohibition of phosphorus, the main active ingredients for the prevention and control of scale insects are chlorpyrifos, pyripropyl ether, thiazinone, spiromethane, etc., in terms of effect, pyripropyl ether, thiazinone, spiromethane ethyl ester, the fast-acting effect is slow, but the effective period is long. Therefore, when choosing preparations, it is often necessary to choose to use a compound ingredient of various ingredients, and then use nicotinoid or pyrethroid insecticides to improve the quick effect.

Finally, it is important to remind that silicone and other additives are indispensable agents for the control of scale insects, because there is a thick waxy layer on the outside of scale insects, and the use of penetrants can make the drug effect better.

These are my suggestions, and I hope to help fruit farmers who are facing the damage of scale insects.

It should be caused by scale insects, which can be sprayed on the whole tree with drugs such as scale insects and fungicides. After the leaves have fallen and before the peach tree germinates, the trunk is coated with a lime-sulfur mixture to kill the scale insects hidden in the cracks in the bark and prevent the tree from developing in the following year.

How to prevent fruit tree rot disease?

1. Bordeaux liquid method (1) dispensing: the ratio of white ash to blue alum is 3 2 kg. The white ash is melted with cold water, the slag is removed, the white ash liquid is poured into the tank, the blue ash is melted with boiling water, one person takes a stick and stirs it in the lime liquid tank, and the other person slowly pours the blue ash liquid into the tank of the white ash liquid until it is stirred into a blue paste, and finally a small amount of water glue can be added.

2) Scrape the bark: Scrape the scar and extend it 1cm beyond the edge of the scar.

3) Application: Use a brush to apply the prepared slurry to the scar, which should be 2-3cm beyond the scar.

2. Wipe off the twigs and dead branches around the scars on the main branch and the main trunk (middle stem) (if it is convenient to bandage, it can also be not cut). With water and new mud (dry and wet to be able to knead into a ball), apply a layer of 3-5cm thick mud on the scar, 4-5cm wider than the scar around it, and press it many times to make it stick tightly to the scar. Then use waste plastic cloth to wrap the mud part tightly for a week (plastic cloth can be wrapped in two layers if there is a tear), and then tie it tightly with straw rope, hemp rope or plastic rope to avoid the mud in the plastic sheet being dried by the wind or washed away by rain.

Plastering can be done from spring to before the leaves fall, but spring is the best. After about half a year to a year, the plastic sheet is removed, and the dry scar formed by the disease is scraped off with the soil.

3. The sodium humate method sodium humate 100x solution + Fumei arsenic 100x solution is mixed, which has a good effect on the prevention and control of scars after scraping. It can also be directly treated with 2% or 3% sodium humate on the scar after scraping.

4. "Arsenic permeability" method: 50 grams of JFC wetting agent produced by Tianjin Auxiliary Factory, 150 grams of 40% Fumei arsenic produced by Tianjin Pesticide Pilot Factory, 2500 grams of water are added together, and stirred into "arsenic permeability". When using, first use an eyepunch to make dense small holes in the diseased skin, including the surrounding good skin, within 2cm, or use a quick knife to dissect the diseased skin, deep into the xylem, intervals, cut strips to grow 2-3cm of diseased spots, cut the outer ring around the good skin for a week, and then evenly coat the "arsenic permeate", and then apply it again after 6 days.

In order to prevent the disease of other good skin and good branches, 150-200x Fumei arsenic plus 100 grams of wetting agent "arsenic exudate" can be sprayed once during germination in spring. Orchards with severe rot disease can be sprayed with 100x Fumei arsenic plus 50g of wetting agent once more after fruit picking and before defoliation. In this way, the apple tree rot disease can be completely controlled.

This method uses the strong penetration of the wetting agent to bring the agent arsenic into the plant to sterilize, thus protecting the apple tree from rot disease.

Botrytis cinereais in peach trees: It is the main disease of peach trees cultivated in greenhouses in the south. It mainly occurs in the flowering period and young fruits, and is harmful to flowers, fruits, and leaves.

The diseased fruit produces a gray mold layer of lesions, and after enlargement, the diseased part is dented and rotted. The lesions on the leaves are light brown at first, and then irregular whorls are seen.

Prevention and control methods: The temperature and humidity of the shed are too high, and it is easy to get sick. Therefore, it is necessary to pay attention to ventilation, reduce temperature and humidity, and reduce the incidence of disease.

Spray 75% chlorothalonil 650 times, or 65% zebsen 600 times, or Baumé stone sulfide mixture plus sodium pentachlorophenol mixture, or 70% methyl tobuzine 800 times solution for control.