Disease

This plant is prone to "brown spot". This is a disease caused by fungi. If you get the disease, primrose will show signs of disease from bottom to top, and spread faster. In the early stage of the disease, some small round spots will appear on the leaves, which are brown and will gradually turn black with the aggravation of the disease. If it gets worse, the disease spots may be connected into one piece. At this time, the leaves will slowly turn yellow and fall, which will also affect the flowering

To prevent this disease, we first need to cut off the infected leaves or branches and deal with them in a centralized manner to avoid infecting other parts. Then spray some chemicals for prevention and control, such as chlorothalonil solution. In addition, it should be noted that before the weather with high temperature or humidity comes, we should reduce the application of fertilizer containing N element and maintain a certain amount of fertilizer containing P element and K element; We should also avoid too much water, especially in the evening

Pest

The first is aphid, which is a very common pest. It often gathers in the leaves and flower buds of plants. In order to deal with them, we usually choose to spray some liquid medicine, such as imidacloprid series liquid medicine, which will have a better effect

Then there is the red spider, which is also a very familiar pest. It is also mainly concentrated in the leaves. To deal with this kind of insect, we can spray some water on the leaves according to their dry characteristics, which can not only wash away the adults and eggs, but also make the environment unsuitable for their survival. Secondly, it is also possible to spray some medicine