Symptoms: leaf spot is its main disease. There are many round spots of different sizes scattered on the leaf surface, with a diameter of about 1-5mm. They are dark brown at the beginning, dark brown after expansion, gray white in the middle and dark brown at the edge in the later stage.
Prevention and control: from the end of autumn to the beginning of winter, the fallen leaves need to be removed, and then concentrated to be destroyed. It is also necessary to strengthen the maintenance, pay attention to the management of fertilizer and water, and enhance the ability of disease resistance. Excessive moisture and water accumulation are the main causes of disease, and timely drainage is required after rain. In the early stage of the disease, you can spray a little Bordeaux, garranon, etc.
Symptoms: in the growth process, because the maintenance method is not correct, it may lead to the infection of aphids, which will gather on the stems and leaves, suck the juice inside, bite the leaves above, and the leaves may dry out, causing problems in the whole growth.
Prevention and control: timely prevention and control shall be conducted before the onset of disease, ventilation shall be enhanced, and possible pests shall be prevented and controlled. If you find insect damage, you can use the yellow board to trap and kill, and apply oil on it to achieve the effect of removal.
