Seedling propagation and cultivation techniques of crape myrtle

The crape myrtle is one of the best ornamental trees and flowers in urban afforestation due to its variety of colors, bright and full bloom, and a short flowering season, long flowering period, rapid growth, easy propagation, strong tree vigor and blooming trees. Because of its high ornamental value, it has been rated by the public as a city flower.

1, species morphology characteristics

The crape myrtle is also known as full house red, hundred days red, itchy tree, Lythraceae, crape myrtle, deciduous shrub, or small tree. Its trunk is green, smooth, with obvious exfoliation, many twisted branches, young branches slightly 4-angled, leaves oval, single leaves alternate. Green, petiole extremely short, flowers towards the top, purple, pink and white. One can open 50-60 flowers, flowering from June to September, Kaixie successively, can be extended for about 100 days, it is also known as "Hundred Days Red." The fruit is oval and the seeds are winged. If the trunk of this tree is gently touched by the hand, the trunk of the whole tree will vibrate, as if it is a conscious animal, so it is also called "fear tree".

2, breeding methods

2.1 Seeding propagation

Sowing method is generally suitable for large-scale breeding. When the seeds mature in October, timely harvesting and drying, use a small cloth bag to be placed in a ventilated and dry place. In March of next year, soak it in warm water of 40-50°C for 2-3 days. After the fish is removed, it can be sown in a short time. When sowing, loosen the seedbed first, and then sow the planting furrow at a spacing of 20-50cm wide. The depth of the furrow is about 3cm. Then spread the seeds evenly into the furrow every 3-4cm. Spread 2-3 capsules as well. After the sowing, cover the ditch and water, pay attention to keep the soil moist. About 50 days or so, the seedlings can be flushed out. At this time, the water is poured once, and weeding the weeds. At the same time, we must do a good job of seedlings, that is, a plant with a seedling distance of 10-15 cm, and the rest are unplugged. After one year, it can grow to 30-40cm in height, and it can bloom in the second year.

2.2 cutting seedlings

Cutting time is generally in late April. Cut off the thick branches after flowering in the first year of the winter, dig it out before and after the rain, and cut about 15cm of cuttings to insert into the loosely-prepared sandy soil. The depth of seedlings is 15-20cm. 2/3, once poured, pour water once, then cover a layer of fine soil about 5cm thick. About 40 days after germination; in May it began to shade. By July, the height of seedlings can grow to about 30cm. At this time, weeding and loosing soil will be carried out. Until October, the height of the seedlings will be 60-70cm.

3, fixed value

In March of next year, the upper shoots of the seedlings were cut off, and the seedlings were transplanted with a root height of about 30 cm and the spacing was 5060 cm. After planting, pour enough water. Afterwards, always water, remove sprouts, loosen soil and weed. It can bloom in the year.

4. Pest control

4.1 Pest Control

The common pests of crape myrtle include purple velvet cicada, yellow scorpion moth, big cockroach moth, aphid and so on.

Control methods: 1 combined with winter pruning, cut off pests, concentrated burned. 2 Protection Red-winged Mosquitoes prey on Lagerstroemia velutipes. 3 In the early stage of larvae, spray 80% of dichlorvos EC 1000 times. 90% trichlorfon 1000 times or diflubenzuron 3 200 times.

4.2 Disease Prevention and Control

The common disease of crape myrtle is Ziwei coal contamination.

Control methods 1 Control locusts and aphids in time. 2 planting should not be too dense and should be properly trimmed to facilitate ventilation. 3 Spray 50% of Tortoise WP 800 times, or spray 70% thiophanate-methyl WP 100 times.

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