What is the reason why the purple leaf tip of osmanthus fragrans is black and withered?

Autumn dew in Xiao Ying is a new branch, which does not occupy most of the spring in the garden.

What happened to peaches and plums? They laugh at sunny people in the wind.

-Wei Zi Flower.

The peaches and plums are silent, but the flowers are very bright and beautiful, which attracts people to watch them one after another. However, flowers in Wei Zi don't like to compete with others for fragrance, and they won't appear in the spring when flowers bloom. It happened that in June, when the sun was shining and the flowers faded, most of the weaker flowers quietly retired, but Wei Zihua began to bloom her own beauty, which lasted 120 days from June to September.

Osmanthus fragrans is not only bright and beautiful, but also colorful. When it blooms, it is full of purple flowers, which is very beautiful. However, osmanthus fragrans has a long tree age, and it is very popular both as an ornamental tree in the courtyard and as a potted plant for maintenance. Lagerstroemia indica likes warm and humid climate, adapts and grows well in most areas, and has less requirements for soil. For example, the deep and fertile sandy loam can satisfy the growth of Lagerstroemia indica, and it is also very simple to maintain. Do you want to plant flowers on the balcony? You must be right to choose it!

However, in the process of flower cultivation, it is inevitable to encounter some problems of pests and diseases. Some time ago, a flower friend came to ask Uncle Gardener: "Uncle, the leaves of my Wei Zihua are all black and withered. What is the reason? " How should it be treated? "Don't worry, uncle will analyze for you one by one. These are minor problems!

First of all, we want to know why Osmunda has this reason. Generally, Osmunda has black leaves, which are generally caused by these two reasons: the first is the phenomenon caused by the normal growth of plants, called pigmentation. If that's the case, leave him alone and he will get better gradually. The second is caused by pests and diseases.

For example, the cause of sooty blotch, also known as soot disease in sooty blotch, is mainly caused by the harm of Lagerstroemia indica and Lagerstroemia indica, because the mucus produced by these two kinds of pests and diseases is nutrition, which leads to the proliferation of coal-contaminated bacteria and the appearance of black mold layer. In this case, it is necessary to deal with aphids, scale insects and other pests in time, because the secretions of these pests are the foundation of sooty blotch. For example, the mixture of stone and sulfur is a commonly used therapeutic drug.

The above-mentioned "velvet" means that female adults and nymphs suck the branches and leaves in the bud axils and branches of Osmunda japonica, making the branches and leaves of Osmunda japonica black and fall off. In view of this symptom, the turpentine mixture of 10%- 15% was sprayed in winter, or the overwintering female insects were eliminated, and it was sprayed three times before Osmunda japonica germinated.

Usually, we should pay attention to the density between branches of Osmunda japonica, and trim the dense branches and leaves in time to avoid the occurrence of pests and diseases caused by the dense branches and leaves. Pruned diseased branches must also be destroyed in a centralized way, so as to eradicate germs and prevent germs from staying indoors and continuing to bury hidden dangers. Generally speaking, Osmunda japonica has strong vitality and resistance to pests and diseases, and its general maintenance is also extensive.

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