The common diseases of arrowhead are mainly white silk disease and leaf spot disease. Let's focus on these two diseases today.
It is quite common that the white silk disease occurs on the arrowhead. When the arrowhead appears the white silk disease, its stem and leaf base will be rotted near the soil, and then the white bacteria will grow, spread in the soil, and then cause the above ground part of the disease to wither and die. In the early stage of the disease, the disease appears white, and in the later stage, it gradually turns yellow, and finally turns brown. The disease mainly occurs in July and August every year, especially when the soil humidity is too high and the soil is poor.
When the white silk disease appears, it can be disinfected by adding disinfectants to the soil where arrowhead is planted. When the sclerotia is not completely formed, the infected soil and the diseased plant should be removed and destroyed. In the process of planting, it is necessary to ensure the air permeability of the plant.
The main symptom of leaf spot is to produce small spots on the leaves, and then gradually expand. The onset time of leaf spot disease is not fixed, which may occur in all seasons of the year. In September October and next March is the peak of leaf spot disease, which will dry the leaves of arrowhead.
Apply appropriate amount of fertilizer to the soil, enhance the resistance of plants, destroy the diseased parts and plants in time to prevent re infection.
