What is the disease of the pear tree tree 75, what is the disease of the pear tree tree

1.Drying roots is the mass experience of preventing and treating root rot disease, which can effectively prevent the onset of the disease or inhibit and slow down the development of the disease. However, it is mainly effective for local invasion of the root neck and invasion of the upper roots.

The specific method is to peel off the soil layer around the root neck (white silk disease and root rot) or root (other root rot disease) to expose it to ventilation and light. The rooting time can start from early spring (March) until the autumn leaves, and can also be carried out in stages, during the rooting period, the tree hole can not be filled with rainwater into irrigation water, therefore, in the rainy season, the soil can be temporarily filled in or outside the hole to build a weir to block water.

2.Sand change is also an effective way to prevent and control root rot in the neck of fruit tree roots. The specific method is to dig out the original soil at the root neck first, and then replace it with clean new sand, and then change it again after half a year to a year.

3. Adopt the method of "root grafting" For the diseased plants that have been infected and rotted in the root neck, the method of "root grafting" can be used to save them.

There are many harmful insects in pear trees, if it is a leaf-eating pest, it only needs to spray phosphine, dichloride, cypermethrin, pyrethrin and so on to successfully control it.

The main cause of rot disease at the base of the trunk of the pear tree is the infestation of the pear borer.

Powdered pesticides are buried in the roots of trees.

If you want to get this disease, hurry up and use pesticides, it's very harmful.

Is the book cover rotten, if yes, it's over.

This is pear tree rust and can be carried out with fungicides**.

How to maintain pear trees.

1. Temperature: Different varieties of pear trees have different temperatures that are most suitable for them. It can be kept at 13-21, which is generally suitable for each variety.

In addition, the cold tolerance of different varieties is also different, if it is a wild variety, it can even tolerate low temperatures of tens of degrees below zero, and in general, almost all varieties do not need to be cold-proof.

2. Light: The pear tree is a very light-loving plant, so it is necessary to provide sufficient light. In general, five to six hours of light per day is appropriate, and more light is needed in winter.

3. Watering: In the growth period, the water demand of pear trees is large, if it is planted in the ground, due to its large volume, the demand for water will be more, and it needs to be replenished in time. If it is a potted plant, keep the potting soil slightly moist.

4. Fertilization: In the growth period, the main types used are nitrogen fertilizers. At the flowering and fruiting stages, it is mainly potassium dihydrogen phosphate in fertile leaves.

The symptoms are that the pear tree will dry up, and the leaves will also fall off, and black spots will appear on the leaves, and white fluff will appear on the nose.

There will be noticeable changes in the foliage, it will turn yellow, some spots will appear, causing the whole plant to wither and die.

You will find that the leaves of the plant are curled on the top, and there will be black spots, the spots will expand, and there will be red and yellow components, and it will affect the yield of the plant, and also affect the final quality.

This is pear tree rust, which can be prevented and controlled by powdered rust.

1. Black spot disease

Black spot disease harms pear leaves and fruits, and the young leaves are the earliest, with round black spots of different sizes appearing in the early stage, and gradually expanding round or irregular disease spots in the later stage, which will lead to leaf loss in severe cases. Strictly clear the garden, remove the diseased fruits and leaves in a timely manner, and destroy the pear tree before germination 3-5 Baumé stone sulfur mixture, spray 1:2 after the onset of the disease

200 times Bordeaux liquid, 50% carbendazim wettable powder 500 times liquid, 65% zeb wettable powder 500 times liquid, spray in advance for prevention, three times a year, spray insecticides and fungicides before and after pear trees.

2. Pear rust

Pear rust infects young leaves, young fruits, seedlings, etc., and in the early stage of the disease, orange-yellow dots of needle-sized size appear at the disease location, and orange-yellow spots appear in the middle of the lesion. In March and April, when it is found that there are lesions on the leaves, spraying can be sprayed with 1000 times of 25% powdery rust wettable powder, generally spraying 1-2 times.

3. Brown spot disease

Brown spot disease mainly harms leaves, such as concentric ring type, needle type, mixed type, etc., and generally harms the leaves of the lower part of the crown or the inner chamber, and the diseased leaves are easy to fall off.

**: In mid-May, pay attention to prevention and control, pay attention to reasonable pruning, improve light conditions, clean up fallen leaves and destroy them in time, and choose fluconazole, tebuconazole, etc.

Fourth, anthrax

It mainly harms the fruit, and mostly occurs in the middle and late stages of growth, and there are black and sunken lesions on the fruit. Pay attention to the garden, do a good job of prevention and control measures, and spray methiotebuconazole, prochloraz, bromonitrile, etc. after the onset of the disease.

Fifth, the problem of insect pests

The insect pests of pear trees include pear aphid, pear weevil, pear eye beetle, pear heartworm and so on.