Prevention and treatment of common diseases of Photinia rubra

Photinia rugosa is an evergreen tree species of Rosaceae. Because the new shoots and tender leaves of Photinia rubra are bright red, so the ornamental value is very high. However, Photinia rubra will also encounter the threat of diseases and insect pests in the process of cultivation. The editor will introduce to you the common diseases of Photinia rubra.

Photinia frase

First, anthrax is easy to be infected with anthrax during cutting, resulting in red leaf Photinia rooting only without sprouting. Prevention and control measures: the seriously damaged leaves are removed and taken out of the nursery in time. At the initial stage of the disease, 70% methyl topiramate wettable powder can be sprayed every 7 ~ 10 days, 500 ~ 1000 times solution of methyl topiramate wettable powder, or 600 times solution of 65% Dessen zinc wettable powder.

Second, the leaf spot appeared on the leaf during the growing period. Prevention and control measures: timely removal of dead branches and leaves in winter and spring, reduce the overwintering places of pathogens, and control with 50% carbendazim 300 Mel 400 times solution, or 50% methyl thiophanate 300 Mel 400 times solution.

Third, when silkworm pupae and leaves are found, silkworm pupae and leaves should be removed in time, and the young larvae can also be sprayed with 1000 times of 80% dichlorvos EC, 1000 times of 50% phoxim EC or 2000 / 3000 times of pyrethroid insecticides.

Fourth, red spiders spray with 20% dicofol 800 times before bud germination in spring, or spray with 40% dimethoate emulsion 800 times.

Prevention and control of common diseases and insect pests of Photinia rubra

Photinia rubra had strong resistance and no destructive diseases and insect pests were found. The common diseases and insect pests of Photinia rubra are quenching disease, blight disease, leaf spot disease, anthracnose, gray mold, leaf spot disease or being harmed by shell insects and so on. These infectious diseases often cause large-scale death of Photinia rubra in a short time and bring serious losses to seedling farmers. Citing the views of seedling experts, the Red Leaf Heather Network introduces you to several comprehensive control measures for reference when seedling farmers need them. First, select the nursery site.

Light clay loam or sandy loam with better water source and higher topography should be selected as nursery land, and rotation system should be adhered to, and the same kind of Photinia rubra should not be cultivated continuously in the same nursery.

When raising seedlings, the soil in the nursery should be disinfected in advance, and the main methods are as follows: ① formalin disinfection: every square meter of nursery is sprayed evenly with formalin 50ml and water 10kg, then covered with plastic film or straw bag, the mulch is opened for about 10 days, so that the gas can be volatilized, and the seeds can be sown two days later. ② carbendazim disinfection: mix 1.5g per square meter with 50% wettable powder. It can also be sprinkled on the seedling bed according to the proportion of 1 ∶ 20, which can effectively control the diseases in the seedling stage. ③ pentachloronitrobenzene disinfection: per square meter nursery land with 75% pentachloronitrobenzene 4 grams, Dysen zinc 5 grams, mixed with 12 kilograms of fine soil, sowing under the pad and cover, against anthracnose, blight, sudden disease, Sclerotinia sclerotiorum and so on. ④ ferrous sulfate disinfection: treat the soil with 3% ferrous sulfate solution, 0.5kg per square meter, which can control coniferous seedling blight, peach and plum leaf shrinkage disease, and chlorosis caused by iron deficiency in flowers. The nursery should be ploughed deeply in winter and once shallowly when sowing in the second year.

Second, seed disinfection

Seeds should be carefully selected before sowing to eliminate diseases and weak species. When sowing, the seeds should be treated with medicine. Soak the seeds with 0.3%-0.5% potassium permanganate solution for half an hour to 1 hour or soak the seeds in warm water of 50 degrees Celsius for 24 hours. Then soak the sunken seeds with 0.2% formalin solution for 30 minutes, and then soak them for another 2 hours. You can also soak the seeds with 0.5%-1% copper sulfate solution for 1 hour to 2 hours, then pick up the seeds and rinse the solution with clean water, and sow the seeds in time after drying. Pay attention to the depth when sowing, and the cover soil should not be too thick so that the seeds can germinate and emerge.

III. Drug treatment

Starting from the seedling stage of Photinia rubra, every 7 to 10 days, 50 kg to 75 kg of 0.5% Bordeaux solution is sprayed on the seedling bed of Photinia rubra every 7 to 10 days, so as to form a protective film on the outside of the seedlings and prevent the invasion of germs. At the same time, fertilizers should be applied mainly with farm manure and supplemented by chemical fertilizers. Garbage compost, compost and barnyard manure may carry germs and should be composted and fermented before use. After the disease, remove the diseased Photinia seedlings in time, sprinkle lime powder around the seedling holes of the diseased Photinia rubra to prevent spread, and apply once every 10 to 15 days, you can spray 100kg / mu of Dexong 500x ~ 800x solution, or 65% Dysen Zinc 300kg ~ 800x solution 100kg, or use 1 ∶ 100kg of arsenic methyl sulfide soil or 8 ∶ 2 grass limestone powder mixed and sprinkle appropriate amount on the bed of Photinia chinensis seedlings. For treatment. It can also be sprayed with copper-ammonium mixture.

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. Leaf spot disease can be controlled with more than 60% carbendazim 300 Mel 400 times or Topurazin 300 Mel 400 times. Scale insects can be sprayed with 200 times of dimethoate emulsion or 800ml 1000 times of liquid spray. Soil silkworm control should be carried out before planting, the land should be properly ploughed, and sprinkled with phosphorus insecticides such as soil insects must be killed. 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.

What are the common types of heather? Planting techniques of Photinia rugosa

[FAQ] what are the common types of heather? How should I plant it?

[expert answer] Photinia is an evergreen tree of the family Rosaceae, which has high ornamental value. The common planting varieties of Photinia are Photinia angustifolia, Photinia angustifolia, Photinia angustifolia and so on. Among them, Photinia is the most ornamental, has the greatest market potential and is widely planted. In this paper, the common species of Photinia and the planting techniques of Photinia are introduced as follows:

Picture: heather

1. Common species of heather

1. Photinia rugosa: Photinia rugosa is a general term of hybrids of the genus Photinia of Rosaceae. It is named for its bright red shoots and tender leaves. There are about 60 species in the world, mainly produced in subtropical and temperate regions of southeastern Asia, eastern and North America. In spring and autumn, new shoots and young leaves are fiery red, bright and lasting in color, and are full of vitality. In summer high temperature, the leaves turn bright green, giving people a fresh and cool feeling.

two。 Elaeagnus mandshurica: Prunus mandshurica, Prunus mandshurica, Prunus mume, Goushu, Shanguanmu, thousand-year-old red, etc., are evergreen trees of the apple subfamily of Rosaceae, which are often cultivated near the garden and graveyard. The leaves are evergreen and decorated with yellow and red fruits in winter, and the color changes greatly in a year. Leaves, flowers and fruits can be seen. It is the most suitable garden tree species in the Yangtze River Basin and the south of China at present.

3. Photinia glauca: Photinia glabra, also known as fan bone wood, light chisel tree, red lemon, grouper, mountain tree, etc., is an evergreen tree of the subfamily Apple subfamily of Rosaceae, which is similar to Photinia and Photinia, but the petiole of Photinia is longer, the leaf is larger, the petals are glabrous near the base, the inflorescence of Photinia is pilose, the flower and fruit are larger, and it is easy to distinguish.

4. Photinia angustifolia: Photinia angustifolia, also known as Niu Jin Mu, Niu Li, Shan Hong Zi, Bang Tou Guo, Pear, etc., is a deciduous shrub of the genus Photinia of the Apple subfamily of Rosaceae, born in low hilly shrubs or forest margins and ditches below 1000 meters above sea level. China is mainly distributed in Henan, Jiangsu, Anhui, Zhejiang, Jiangxi, Hunan, Hubei, Sichuan, Guizhou, Taiwan, Guangdong, Guangxi and other places.

Photo: Photinia rugosa

2. Planting techniques of Photinia rugosa

1. Growth habits: Photinia likes strong light, but also very shady, like warm, moist growth environment, suitable for growing in slightly acidic soil, climate requirements are not too strict, can withstand the low temperature of-18 ℃, can be cultivated in all parts of our country.

two。 Soil selection: the soil of Photinia chinensis is loose, fertile, slightly acidic to neutral, and cultivated in sandy soil is the best choice. the requirement of soil is not strict, and it can grow normally in red and yellow soil.

3. Cuttage culture: in general, Photinia rubra is propagated by cuttings, so it is necessary to choose branches with strong growth and no diseases and insect pests. Note that the cuttings had better use semi-lignified twigs or woody annual branches. According to these standards, cut 6cm long branches from the plant as cuttings.

4. Seedling transplanting: the planting time of Photinia chinensis is generally from March to April in spring and from October to November in autumn, and the planting spacing should be determined according to the local climatic conditions, and the planting spacing should be determined according to the time of keeping the nursery and the cultivation target. If it is planned to sell annual shrubs, the appropriate row spacing is 35 × 35 cm or 40 × 40 cm, and about 3000 plants per mu.

5. Pruning and shaping: Photinia pruning branches are very strong in germination and grow very fast. They are extremely resistant to pruning and easy to be pruned. They can be pruned all the year round, but they should be pruned mainly in winter, mainly in short truncation and thinning, etc., and high temperature in summer is not suitable for short pruning and heavy short pruning, otherwise it is more difficult to restore the tree potential after pruning.

6. Watering the right amount: Photinia rubra is more wet, but excessive water is easy to cause disease, so we must strictly control the moisture. Watering should be moderate, but no stagnant water, preferably from 8 to 10:00 in the morning, or from 4 to 6 in the afternoon.

7. Fertilization management: apply urea every half a month in spring, about 5 kg per mu in spring, about 5 kg per mu in summer and autumn, and mature organic fertilizer in winter with a dosage of about 1500 kg per mu.

8. Prevention and control of diseases and insect pests: Photinia chinensis has strong resistance and no destructive diseases and insect pests have been found for the time being, but if it is not managed properly or the environment of the nursery is bad, gray mold, leaf spot or be harmed by shell insects and soil silkworms may occur. In case of these diseases and insect pests, we should pay attention to take corresponding measures to prevent and control them in time to ensure the normal growth of Photinia rubra.

As an important ornamental tree species, there are many kinds of heather with great market potential and broad prospects. The above introduces the common species of Photinia and the planting technology of Photinia rubra. I hope it can be helpful to you!