Cultivation, management and control of yellow oak bonsai with mealworm disease control measures
The author | Jinglan ecological landscape
When not competing with the spring color, Xie Quanfang is only wu qiu.
Yellow oak, also known as red leaves, tobacco trees, deciduous shrubs or small trees of the family Sumacaceae. The bark is dark grey-brown, the new branches have a smooth epidermis, and the old branches are rough. The leaves are ovate and the petioles are slender. It has small yellow-green flowers, the inflorescence is conical, and the stem of the infertile flower is pink feather-shaped, and it blooms for a long time without withering. In the spring, the young leaves are shaded, the mid-spring is emerald green, the branches are luxuriant in mid-summer, and the autumn leaves are dyed in late autumn. Patches of yellow oak are like wisps of cooking smoke, swirling endlessly.
In recent years, bonsai made of yellow oak tree stumps has been favored and loved by the general public. Its tree posture is simple and vigorous, and its branches are ever-changing and dazzling.
If you dig from the mountains, you can do it from late autumn to the spring of the following year. It grows mostly on the sunny slopes and between the cracks in the rock crevices of the cliffs, and its posture is tortuous and vigorous, like a dragon born. Excavation can be taken perennial, pole branches are curved, short and thick old piles. Because there are not many roots, the roots should be preserved as much as possible when excavating, the taped main root is cut off, and the unwanted branches are cut. Wrap it in plastic bags, moss, grass ropes, etc., to moisturize the roots, avoid dehydration, and lose the opportunity to cultivate.
Rough (downhill pile) bagged sand breeding, to the resurrection into the daily cultivation of a period of time after moving to purple sand pots, glaze pots a type of planting, of which, to pottery pots, purple sand pots are the most suitable, such as ornamental, choose black and other dark color glaze pots are especially good. If the conditions are met, the colorful, single-dark pottery bottle can be cut off according to the similarities and differences in form, and transplanted into it. Fun and fun, elegant and extraordinarily elegant.
Propagation of yellow oak has seed sowing, striping, plant splitting method and so on. As for rare varieties such as American red leaf yellow oak and golden leaf yellow oak, other domestic yellow leaves can be used for grafting.
The branches are soft, easy to trim and shape. Because its leaves are large and sparse, the petiole is long, most of them use a natural crown to close the top, and the common tree postures are straight dry, curved dry, cliff, double dry, jungle, lying dry, stone, big tree and so on. Most of the branches are made of metal wire and other materials coarsely tied and finely sheared, and if the trunk is thick and it is not easy to take the bend, the method of cutting off the animal branches can be adopted: cutting in the bending part of the trunk, making new branches, gradually storing, cultivating, and adjusting the tree shape. For small piles, it can be cut and applied, depending on the needs of the main pole and some branches, and gradually sort out the high and low staggered, dense, beautiful form, interesting and flexible posture. In order to make the tree shape plump, in the growth season, the head is plucked, the long branches, crossed branches, parallel branches, diseased insect branches, and fine weak branches are cut off, and the control and adjustment are made to promote the germination of more branches and leaves on the side branches, and the leaf potential is denser and more perfect.
Huang Li prefers a warm, humid, sunny environment and is resistant to cold. On weekdays, it can be maintained in the outdoor light, air circulation, and the summer high temperature can be properly shaded to avoid exposure. Watering master does not dry (in a slightly damp state) do not water, watering is thorough, to avoid long-term accumulation of water in the potting soil. Large fat and large water can easily lead to plant growth and excessive leaves. During the daily maintenance period, water is sprinkled every morning and evening to improve the air humidity so that the leaves are fresh and vibrant. In winter, move indoors or to a sheltered place in the sun, at which time the potting soil should not be too dry to avoid soil "dry freeze" and damage to the plant. Depending on the size of the plant, turn the pot once every 1-2 years or so before germination in the spring, remove half of the old soil when turning the pot, mix in the new soil, and put some organic fertilizer such as rotten cake fertilizer on the bottom of the pot to replant. For soils, loose, fertile, humus-rich sandy soils with good drainage and breathability are preferred.
In the season of vigorous growth, moderate trimming is carried out again to leave a straight bend, (pruning the main vein of the branch, retaining the side branches) so that after several years of maintenance, the hard corners of the branches can be twisted and turned, and the strength is strong.
HuangQi has a strong force, and the excess bud points should be erased in time after spring buds, so as not to consume nutrients in vain and hinder its good growth.
Powdery mildew is one of the main diseases that harm Astragalus. Pathogenic bacteria overwinter on fallen leaves or branches as closed shells, and also in buds in the form of hyphae. In the early summer of the following year, the closed cyst shell absorbs water and cracks and releases ascospores, and the mycelium directly produces conidia for the first transmission, and the conidia are re-infected in the growing season. In May and June, the rains are early, and the onset of the disease is also early, and vice versa, it is delayed. Every year in July and August, the amount of rainfall determines the severity of the disease in the current year.
Powdery mildew begins in the lower leaves of the plant and then gradually spreads upwards. The disease progressed slowly from the beginning of the disease to early August, and from mid-August to early to mid-September, the disease spread rapidly. Due to the strong tillering force of the roots of the yellow oak plant, there are many young tissues, and it is closest to the source of overwintering bacteria. Due to the excessive density of the plant, poor ventilation causes disease. In contrast, trees that grow on the top of the mountain have a milder incidence of disease than those that grow in the Valley of the Nest Wind. The main occurrence of this pathogen occurs in Beijing, Shandong, Hebei, Henan, Shaanxi, Sichuan and other places, especially in Beijing and Xi'an. At the beginning of the onset, white needle-like spots appear on the leaves, and then gradually expand, forming nearly circular spots, the spots are radial around the spots, and in the later stages, the leaf surface is covered with white powder, which becomes the last black-brown granule, that is, the closed shell of the pathogenic bacteria. The harm of powdery mildew can lead to the obstruction of photosynthesis, dry leaves or early shedding, resulting in weak growth, autumn leaves are not red, become grayish yellow or dirty white.
Prevention and control measures
1. Avoid the source of infection
In autumn, combined with Qingyuan, the diseased leaves are completely removed, and the diseased dead branches are cut off and burned; The ground is sprayed with sulfur powder. Strengthen water and fertilizer management, improve tree potential, and enhance its disease resistance; In the spring, tillers are pruned in time to reduce the germ site.
2. Pharmaceutical prevention and treatment
Sprayed with Baume 5 degrees, stone sulfur compound, extinct overwintering fungus source. At the beginning of the disease, spraying 15% wettable powder rust 800 times liquid can effectively control the disease.
Attached: Bonsai root replenishment method - root system
This method is suitable for people with severe root disc defects, such as single root, few roots, root rot, and material that needs to be reconnected in most areas of the root disc. It can be re-rooted by ringing the upper part of the root plate, but for tree species with weaker or less difficult roots, this method is often prone to failure, resulting in the death of the entire plant. Therefore, it is relatively prudent to adopt the method of relying on the root system. In cases where grafts are required on all sides, the punching method is not suitable. Because of the porosity, there will be crossovers between them, and the definite purpose will not be achieved.
Rooting method step
1, the material that needs to be processed - take the seedlings that are close to the connection, clean them, and soak them in clean water to prevent the root system from drying out.
2, the material that needs to be processed - in addition to the floating roots, the xylem of the pile foundation has been carbonized or decayed, and it is difficult to root again.
This situation generally occurs when separating prematurely at high pressure or mountain picking materials, the root potential is weak, the treatment is not timely, and it is difficult to form a balanced root potential and a uniform octagonal root system.
(The state of the cutting completed, as shown above)
The state after excision should be: fresh xylem, forming layers, and phloem can be seen. Cut the edge of the root disc with a poke out of the bevel in order to increase the area in contact with the seedling forming layer, accelerate the mutual integration, and gradually merge into one.
The seedlings used to be used to connect are cut out of a cross-section, which is close to the section they have cut. (Pictured below)
Finished close by, fixed with small nails to make it close together. Over time, the sectional healing layer merges into one, slowly forming new xylems and phloems.
By analogy, repeat its steps where they need to be docked.
Apply a healing agent to the adjacent area to prevent moisture from dissipating and can prompt it to heal faster.
At the bottom of the wood removed, apply preservatives and other drugs to avoid decay (above).
The status of the rooting complete (above). Wait for the joints to be completely integrated, and the seedling part can be removed.