The function of Arbor crape myrtle how to maintain it

The most important thing to pay attention to in breeding tree crape myrtle is to control its diseases and insect pests and prune the flower branches which are not growing well or infected with diseases and insect pests, because these two hazards affect its ornamental value the most.

The function of crape myrtle in Arbor

Purify the air: Arbor crape myrtle is resistant to drought, afraid of waterlogging, likes warm moisture, likes light, likes fertilizer, has strong resistance to sulfur dioxide, hydrogen fluoride and nitrogen, and can inhale harmful gases. It is determined that the leaf can absorb 10 grams of sulfur per kilogram and grow well. Crape myrtle can also absorb dust. In the cement plant, it can absorb 4042 grams of dust per square meter, which is 200 meters away from the pollution source. Therefore, it is the most ideal tree species for urban, industrial and mining greening, and it can also be used as bonsai.

Medicinal value: Arbor crape myrtle also has pharmaceutical effects. Li Shizhen discussed in the Compendium of Materia Medica that its bark, wood and flowers have the effects of promoting blood circulation and promoting menstruation, relieving pain, detumescence and detoxification. Seeds can make pesticides and have the effect of killing pests. Ye Zhi white dysentery, flower treatment of postpartum blood collapse, children with rotten head and fetus poison, radical cure carbuncle sore poison, it can be said that the whole body is a treasure.

Ornamental value: the most precious tree crape myrtle is a newly cultivated "red-leaf tree crape myrtle" in Japan. The leaves are bright red all year round (the highest temperature in late summer and early autumn turns to purplish red), and the flowering period is longer, flowering in that year, flowering for more than 160 days, with very high ornamental value.

II. Pruning points for attention of crape myrtle

Crape myrtle has a strong sprouting ability, so it is necessary to do a reasonable pruning work according to the use of cultivation. Clustered seedlings, we should pay attention to set aside enough growth space, would rather stay less, generally set aside 2-3 main poles, 5-6 main branches can be left, in this way, red leaf crape myrtle can grow well. For single-stem seedlings, it is necessary to control the meristem, pay attention to the cultivation of the main rod, and then cultivate the crown after the main rod has grown.

Third, the method of prolonging the flowering period of crape myrtle.

The tree crape myrtle blossoms earlier. The seedlings with better management can generally blossom in that year. In order to prolong the flowering period, the branches that have already flowered should be cut off in time, so that they can sprout again and grow a new round of flower branches. The branches and the sprouting of branches should be cut off at the right time in the process of growth. If you want to make the trunk stout, you can also cut off a large number of flower branches in the early stage and concentrate on nutrition to cultivate the trunk. Winter pruning is generally carried out after falling leaves in autumn, and the long branches, dry and withered branches, drooping branches, disease and insect branches, slender branches and endophytic branches should be cut off, and the lateral branches in the lower part of the plant trunk should be cut off in time in the young tree stage, so that the upper part of the trunk can get sufficient nutrients and form a good crown. With reasonable pruning, adequate fertilizer and water, and proper management, crape myrtle can blossom many times a year, with a total flowering period of 100-120 days, with a maximum of 160 days.

IV. Disease and pest control of crape myrtle

Prevention and control of aphids: 1.2% bitter tobacco EC can be sprayed 800 to 1000 times, or 50% aldicarb 3000 times, or 2.5% imidacloprid 2500 to 3000 times, or 6% imidacloprid 3000 to 4000 times, etc. one of them is foliar sprayed, and pay attention to safety when spraying.

Control of crape myrtle scale: within 7 days after the peak incubation period of nymphs, 1500 to 2000 times of EC, 2000 times of imidacloprid soluble solution and 2500 times of pyrethroid pesticides were sprayed on branches and leaves when wax was not formed or waxy layer was just formed. Good results can be achieved when the above three agents are used alternately and sprayed every 7 to 10 days for 2 to 3 times in a row.

Control of the big coir moth: the pouch of the bag moth can be seen after falling leaves in winter, which can be removed manually; the adults are trapped and killed by frequency vibrating insecticidal lamps; the larvae are sensitive to trichlorfon, and good results can be achieved by using 1000 to 1500 times of trichlorfon crystals. You can also use 2.5% deltamethrin EC 3500 to 4000 times, or 50% phoxim EC 1000 to 1500 times, 20% chrysanthemum EC 1000 to 1500 times, etc., spray to be uniform.

Prevention and control of coal pollution disease: mainly caused by the secretion of prickly sucking pests such as aphids and shell insects, the key to control it well, it can also be sprayed with 500 times carbendazim.

Arbor crape myrtle is a kind of plant with very high ornamental value. In general, crape myrtle is mainly used to watch flowers, but the "red-leaf crape myrtle" introduced from Japan also has the function of watching leaves, so if there are friends with suitable conditions at home, but try to breed.