Magnolia pest control

Magnolia pests and diseases 1: Leaf spot

At the beginning of the onset of magnolia leaf spot disease, there are only small dark red spots on the surface of the leaves. If not treated in time, they will continue to expand very quickly and then connect into large pieces, eventually causing the leaves to wither or even fall off, seriously affecting the beautiful appearance of the magnolia. You should check the leaves more often and treat them promptly if you find any diseases, pests or insect damage.

Prevention and control methods: You should check the leaves of magnolia regularly and start treatment as soon as possible if you find any disease. You can use 50% thiophanate-methyl to spray on the surface of magnolia leaves, once every 7-8 days. Spray 2-3 times in a row and it will be cured.

Magnolia pests and diseases 2: scale insects

There are many kinds of magnolia pests, and once they occur, they are quite serious. Most of them are caused by scale insects. The pests are difficult to deal with, so you should pay more attention to them.

Prevention and treatment methods:

Water the magnolia at regular times, but don’t water it too much, as excessive moisture in the soil can lead to pests. At the same time, apply fertilizer moderately and increase the application of phosphorus and potassium fertilizers.

Move magnolias from indoors to outdoors more often to ensure good ventilation. If diseased plants are found, remove them in time and clean them up.

Usually, you should observe the leaves of magnolia more often. Once scale insects are found, you can spray them with 2000-3000 times diluted imidacloprid or imidacloprid improver to kill the insects.

Magnolia pests and diseases 3: Pittosporum sphaerocephala

This is a very common pest that can cause serious damage once it occurs. This insect often gathers on the buds, leaves, branches and trunks of the magnolia to suck juice. When the situation is serious, the entire branch will be covered with insects, causing the leaves to turn yellow, deform, fall off, and wither, and even the entire plant to die. It is also easy to induce sooty mold, which makes the surface of the magnolia leaves turn black, hinders photosynthesis, affects the growth of the magnolia, and thus reduces its ornamental value.

Prevention and treatment methods:

It is necessary to strengthen the water and fertilizer management of magnolia, water and fertilize appropriately to enhance the resistance of the plant.

In the early stage of the disease, there are fewer insects and they can be scraped off manually or rinsed with clean water, but be careful not to damage the leaves.

Use pesticides, spray with 1000 times omethoate solution, once every 7 to 10 days, and it will be effective after 2 to 3 times.