Knowledge of prevention and control of common diseases and insect pests of Photinia rubra

Photinia przewalskii has strong resistance, but if it is not managed properly or the nursery environment is bad, gray mold, leaf spot or be damaged by shell insects and soil silkworms may occur. As a member of the Garden China Network, I introduce some of my experience to the majority of flower lovers. I hope you can communicate and learn more.

First of all, understand what kind of diseases and insect pests it is:

1. Botrytis cinerea can be prevented by spraying 50% carbendazim 1000 times solution, and during the onset period, 50% Dysen zinc solution can be used to prevent and control the disease.

2. Leaf spot can be controlled with more than 60% carbendazim 300 Mel 400 times or Topurazin 300 Mel 400 times.

3. Scale insects can be sprayed with 200 times of dimethoate emulsion or 800m of 1000 times liquid spray.

4. The control of soil silkworms should be carried out before planting, the land should be ploughed properly, and phosphorus-containing pesticides such as soil insects must be killed.

Matters needing attention

If you encounter the harm of soil silkworm after planting, it needs to be remedied in time, otherwise it will do great harm to spread, especially for Photinia rubra at seedling stage, which may cause large area death.

Common diseases and insect pests of Photinia rubra

Common diseases and insect pests of Photinia rubra

1. Bombyx mori

This is mainly aimed at the infancy of Photinia rubra. Some places near rotten plants are easy to breed local silkworms, such as firewood piles, haystacks and livestock pens in rural areas. The main harm of the soil silkworm lies in its gnawing on the root of Photinia rugosa. If you find many normal-growing seedlings that suddenly lodge or beat, you can pull out the seedlings and check the roots. if there are obvious signs of insect pests eating, it is likely to be infested by soil silkworms. You can open the nearby soil and usually catch the soil silkworms.

There are many ways to kill the soil silkworm, using soil silkworm insecticide spraying or liquid insecticide spraying, can play an obvious control effect. The prevention and control of soil silkworms should be timely, and the insecticidal effect should be tracked. If it is not thorough, it needs to be killed again.

two。 Hairy spicy seed

The name may be different from place to place, and there is obvious pain after people's skin comes into contact with it. This kind of insect mainly appears at the turn of spring and summer. If it is not controlled in time, the pest can last until autumn. Causing a large area of red-leaf Photinia leaves to be eaten, causing serious harm to the growth of red-leaf Photinia.

The main control methods are phosphorus-containing insecticides. Need to spray the whole field, the general effect is very obvious. Most of the spicy seeds will die after spraying insecticide. If you get rid of insects thoroughly, you only need to do it once a year.

3. Heart-drilling worm

This term is not necessarily accurate. The symptoms of its diseases and insect pests are drilling holes in the tree trunk and a lot of sawdust in the soil below the tree trunk. This pest usually occurs on Photinia rubra, which is more than 3 years old. The older the tree is, the higher the incidence is. If left untreated, the trees will be hollowed out and broken.

The main control methods are phosphorus-containing insecticides. A diluted insecticide can be injected into the wormhole by needle injection. Usually in the foliar application, the trunk can also be sprayed appropriately to increase the control effect.

Tip: if you want to know more about seedlings, please go to Northwest Seedling Network for information. Source of this article (Seedling Wholesale Network)

Cultivation techniques and pest control knowledge of red-leaf Photinia container seedlings

With the development of container nursery, the advantages of container seedlings are becoming more and more obvious. In order to facilitate the promotion and sale of new excellent color-leaf tree species, the cultivation in the form of container seedlings is more and more adopted. Photinia chinensis, as a new excellent colored leaf tree species, is being accepted by more and more nursery producers, and the cultivation form of container seedlings is also gradually adopted.

1. Seed and seedling selection:

Photinia rubra propagates mainly by cutting. The seedlings that can be selected are ground cuttings, container cuttings and tissue culture seedlings. If the producer has just started the production of Photinia container seedlings, it is recommended to introduce container cutting seedlings, that is, hole plate seedlings or tissue culture seedlings, in order to ensure the survival rate of seedlings. Of course, you can also use land to plant cuttings, or grow cuttings to be sold before container cultivation.

Second, the choice of containers:

For the producers of container seedlings of Photinia rubra, the choice of containers is very important. Different containers should be selected according to different specifications of seedlings and different cultivation purposes. At present, there are many varieties and specifications of containers on the market, such as considering long-term planting, you can choose woody planting container gallon basin, its service life can reach about 3 years, anti-aging, can be reused, as the first choice for cultivation; if considering short-term sales, you can choose woody planting bags, its service life is about 1 year, and the cost is low.

3. Media:

The ideal container cultivation medium should be 50% solids, 25% air and 25% moisture. As a medium, there are many substances, such as fine sand, peat, perlite, pumice, pine scales, nuclear scales, coconut bran, sawdust, straw, grain husk, carbonized grain husk, bagasse. Specifically, the mixed media should meet the following requirements:

(1) good air permeability, good drainage and strong water holding capacity.

(2) the ph value is between 5.5 and 6.5, the EC value is low, and it has sufficient cation exchange capacity to continuously supply the elements needed for plant growth.

(3) the standard of material selection is the same, there are no toxic substances and no germs, pests and weed seeds.

In the proportion of cultivation media, we should also consider the combination of several media materials as little as possible, and it may be necessary to adjust the ph value and add long-term controlled-release fertilizer. Considering the factors such as cost and medium source in production, peat and perlite are the main medium materials.

Fourth, the seedlings on the pot:

The cultivation medium of Photinia container seedlings uses peat: perlite = 4:1, slaked lime should be added to adjust ph value and supplement medium calcium nutrition (because peat is sour and calcium deficient). When potting, we must pay attention to several points: the root system should be stretched, the seedling should be upright, and it should not be planted too deep. Generally, the hairy root should be embedded in the medium 2~3cm.

Fifth, the use of fertilizers at the seedling stage:

The most convenient way to produce container seedlings is to use long-acting slow-release fertilizer, which has a long effective period, and only needs to add an appropriate amount when using the medium. Container seedlings can be irrigated with slow-release fertilizer or water-soluble fertilizer after planting.

In container seedling production, peat and perlite are often used as media, and there is a lack of ca, mg and trace elements, so it is necessary to supplement water-soluble fertilizer in addition to controlled-release fertilizer, so as to quickly and effectively supplement a variety of trace elements necessary for seedling growth and make seedlings grow healthily.

6. Change the basin:

When the root system of Photinia chinensis container seedlings is full in the container, when you see that the fibrous root has wrapped the peat, when the water is difficult to pour through, it is necessary to change the pot. The main points of changing the basin: empty basin plus 1 big 3 medium (base fertilizer, mix well), seedling placed in the center of the basin, upright, filled with medium, slightly pressed around, shake.

The container to change the basin must be larger than the original, the medium can be added loose scale or nuclear scale medium, sand loam without weed seeds, in order to reduce the cost.

When the recycled medium is reused, it must be disinfected (600 times 800 times with dimethicol or other disinfection methods).

When the seedlings change pots, the most convenient and economical way to apply base fertilizer is to use long-acting slow-release fertilizer, which only needs to add appropriate amount in the medium ratio. The amount of fertilization depends on the size of the container.

Taking advantage of the opportunity to change the basin, we can correct the bad growth direction of the seedling and make it grow towards the shape we want.

The container seedlings in the changed pots should be placed neatly, the number of seedlings in each district should be the same, and there should be walkways to facilitate watering, fertilization and other operations.

VII. Management:

The internal space of the container is limited and the water and fertilizer holding capacity is very limited. In order to make the container seedlings grow healthily, it is necessary to replenish water and fertilizer to the medium in the container regularly. Watering is a frequent and fine management process. Usually, large containers are watered once every two weeks, and small containers are watered every three or six days. Of course, the watering frequency is also closely related to the size of seedlings in the container. Uneven watering will cause seedlings to lose water and wilt. Only by watering thoroughly can the potted seedlings grow strong. In general, the peat in the upper part of the container needs to be watered again when the peat in the upper part of the medium turns white, not until the seedlings wilt. In particular, it should be reminded that after the wilting of the seedlings, only a small amount of water wetting medium can be irrigated at the beginning, and only when the wilted leaves of the seedlings return to normal can they be watered through, and must not be irrigated at one time, otherwise it is easy to cause the roots to rot in the water and lead to the death of the seedlings. If it is difficult to penetrate during watering, it is because the medium is too dry or the root system tightens the medium, which can shorten the watering cycle in management, or use sprinkler irrigation equipment to water regularly.

Topdressing is a very important operation for the production of red-leaf photinia container seedlings. Limited root growth space and regular watering make the fertile Photinia appear to be undernourished. However, the frequent use of quick-acting fertilizers not only causes burning of seedlings, but also increases the cost and difficulty of production and management of container seedlings. Therefore, we try our best to recommend the use of apex long-acting controlled release fertilizer to container seedling producers, which only needs to be applied once or twice a year, which greatly saves labor. When topdressing, the hole can be applied, that is, the Jack, the fertilizer will be applied in the hole, the number of holes in each basin depends on the size of the container.

8. Pest control:

The main container seedling diseases of Photinia rubra are anthracnose, leaf spot and so on. Prevention and treatment: spray control is used during the disease period, with 50% carbendazim 500 times, 75% chlorothalonil 500 times 800 times, and 50% topiramine 800 times 1000 times. Spray once every 7 to 10 days for 3 or 4 times in a row. Root diseases can be irrigated with 800-1000-fold solution of Dike. It is usually necessary to spray medicine in time to prevent wound infection after pruning.

The main pests are aphids, moth larvae and so on. Using periodic spraying control, choose imidacloprid 800x solution, 90% trichlorfon 1000 times solution or 50% fenitrothion 1000 times solution, or pyrethroids. The nursery should be inspected frequently and the newly hatched larvae should be sprayed in time.