At the beginning of the disease, there are only dark red dots on the surface of the leaves. If not treated in time, they will continue to expand and grow rapidly, and then they will become large pieces, which will eventually cause the leaves to wither or even fall off, seriously affecting the beautiful appearance of Mulan. Usually, we should look at the leaves more often. Once we find diseases and pests, we should treat them in time.
Prevention and control method: you should often look at the leaves of Magnolia at ordinary times. Once you find the disease, you should start treatment as soon as possible. You can use 50% of tolbutine methyl to spray on the surface of magnolia leaves. Spray once every 7-8 days, and spray 2-3 times continuously to recover.
There are many kinds of pests in Magnolia, and once they happen, they are more serious. Most of them are pityriasis scale. It's troublesome to deal with them, so we should pay more attention to them at ordinary times.
Control method:
Usually, water Magnolia at the right time, but do not water too much, because the soil humidity is too high, it is easy to produce pests. At the same time, appropriate fertilization and increase the application of P and K fertilizer.
At ordinary times, move Magnolia from indoor to outdoor for ventilation to ensure good ventilation. If any disease is found, it shall be removed in time and cleaned up.
We should observe the leaves of Magnolia at most times. Once we find the insects, we can use insecticide imidacloprid or imidacloprid 2000-3000 times to spray.
This is a very common pest, once the occurrence of serious harm. This insect often concentrates on the buds, leaves, branches and stems of magnolia to suck the juice. When it is serious, the whole branch will be full of insects, causing the leaves to turn yellow, deform, fall leaves, dead branches, and even the whole plant to die. Moreover, it is easy to induce coal pollution disease, making the surface of magnolia leaves black, hindering photosynthesis, affecting the growth of Magnolia, thus reducing the ornamental value.
Control method:
It is necessary to strengthen the water and fertilizer management of Magnolia, water and apply fertilizer appropriately, and enhance the resistance of plants.
In the early stage of the disease, there are fewer insects, which can be scraped off manually or washed with clear water, but it should be handled with care and do not hurt the leaves.
Use insecticide, spray with 1000 times of Omethoate solution, spray once every 7-10 days, 2-3 times can get the effect.
