Methods of Propagation for White Magnolia
The editor will explain the topic of flower propagation, focusing on the knowledge of propagating white magnolia. Here are the methods for propagating white magnolia, which will be detailed by the editor.
Propagation of magnolia can be done through grafting, layering, cutting, and sowing, but the most commonly used methods are grafting and layering.
(1) Grafting Propagation: There are two methods in grafting, one is approach grafting, and the other is cut grafting. ① Approach Grafting: Approach grafting can be done throughout the growing season from spring to autumn, with April to July being the most common. The best position for approach grafting is 70 centimeters above the ground. After binding, wrap with a mud ball and cover with leaves to prevent rainwater erosion. It can be separated after about 60 days. Approach grafting is an easier method to survive but is not as vigorous as cut grafting.
(2) Layering Propagation: Layering propagation also has two types: common layering and high-layering. ① Common Layering: It is best to perform common layering in February to March,割 half the depth of the base of the branch to be layered, then make an incision upwards, insert a piece of tile in the middle, gently press it into the soil without breaking it, insert a U-shaped thick wire into the soil to secure it, preventing it from翘起, then pile soil on it. For spring layering, it can be cut and transplanted after roots have emerged. ② High Layering: Before the start of the hottest days of summer, select healthy and disease-free tender branches (1.5-2 cm in diameter) on the mother plant, cut a crack at the base of the branch, then cover with a bamboo tube or a bottomless pottery jar filled with potting soil, tie it securely with thin绳, and gently spray water to keep it moist. By the following May, new roots will have formed and can be transplanted.
What are the common pests of magnolia? How to control them? The common pests of magnolia include the cicada, red wax scale, cottony cushion scale, and red spider.
(1) Cicada: The nymphs of this pest suck the root sap of flowers in the soil, while the adults not only suck the sap of the main leaves but also the females insert their ovipositor into the branches to lay eggs, causing the branches to wither.
Control methods:
① Promptly search for and kill the mature nymphs that have just emerged from the soil.
② If there are many, you can light a fire near the tree trunk during hot nights in summer, shake the branches to make the cicadas fall into the fire, and kill those that fall outside the fire pile.
③ Apply a sticky tung oil or a sticky ball made from cobwebs to the top of a pole to catch adult pests.
④ Regularly inspect and prune the egg-laying branches from April to August.
(2) Red Wax Scale: Both the nymphs and adults of this pest suck the sap of flowers, and their excrement often causes sooty mold, forming a layer of black mold or a thick black film on the leaves, making the whole plant black, weak, and seldom flowering or unable to flower at all.
Control methods:
① In winter and early spring, remove some branches with many pests during pruning.
② If the affected plants are few and short, they can be manually scraped in winter and spring.
③ Spray 25% diaminothiocarb emulsion 1000 times liquid or 40% dimethoate emulsion 1500 times liquid during the peak hatching period of nymphs, every 4-6 days for three times to see effects.
④ When introducing flower seedlings, carefully inspect to prevent the pests from being brought in.
(3) Cottony Cushion Scale: Refer to the control methods for cottony cushion scale in "Peony".
(4) Red Spider: The red spider, also known as the cinnabar spider mite, refer to the control section of cinnabar spider mite in "Jasmine".
The above is a detailed explanation of the propagation methods of white magnolia. I hope this article can bring you help in green plant management!