Is the disease can not avoid Dahlia suffering from dark stripes how to do?

Now is the active season of Dahlia, Dahlia is gorgeous and fascinating, which is one of the reasons why many people love it. But the editor has also heard the "worries" of many flower friends and some difficult problems about the maintenance of dahlias. Among them, there is such a problem, how is it that the leaves of dahlias grow spots from the edge and slowly blacken and zoom?

The leaves withered. It's a disease.

According to the editor's judgment, he is likely to be suffering from dark stripes. Presumably everyone is not very clear what is dark stripe, what are the symptoms? In order to let everyone encounter the same symptoms in the future, you can directly prescribe the right medicine to the case.

With dark streak, round or semicircular dark green spots appear on the leaf surface and edge, and after a period of time, the spots begin to turn dark brown and turn grayish green in the middle. When the disease develops to a certain extent, small black spots grow on the spot, and even when the disease is serious, the leaves begin to wither and droop.

Fungal infection is the culprit.

The pathogen of dark stripe disease is Phytophthora dahliensis, which belongs to half-known fungi. The pathogen overwinters with mycelium and conidia on the diseased body or diseased parts, and in the coming year, the wildfire will burn forever, the spring breeze will still flourish, and the conidia will begin to float and spread everywhere through the wind and rain. carry out primary infection and re-infection, and finally make the plant sick.

Timely treatment is the right solution.

Flower friends should not be merciful in dealing with dark streak, remove the diseased body or diseased parts in time, and concentrate on burying or burning them to prevent the growth of germs.

Cutting off and burning the diseased leaves in a small amount of disease can inhibit the spread and development of the bacteria.

Flower friends should pay attention to rational fertilization, apply less nitrogen fertilizer and increase potassium fertilizer, and strengthen maintenance and management, which can improve the disease resistance of plants.

Flower friends can be reasonably close planting, timely drainage, the formation of ventilation and light, no stagnant ecological environment, can reduce the incidence of disease.

Once it is found that the initial use of 75% chlorothalonil wettable powder 500 times liquid, once every ten days or so, prevention and treatment once or twice.