Leaf spot of Carnation

There are many kinds of diseases and insect pests that harm carnation. Unsuitable cultivation environment and mismanagement can induce the aggravation of diseases and insect pests.

Carnation leaf spot disease, also known as carnation white spot disease, can harm a variety of flowers of Carnation family.

[pathogen] Neurosporum caryophyllum (SeptoriadianthiDesm.) belongs to the subphylum of fungal semi-knowledge, Cercospora.

[symptoms] the disease damages leaves and stems. Near-round spots are formed on the leaves and stems, about 5 mm in diameter. The disease spots are light brown, the edges are purple, and the center can be white due to the detachment of the epidermis. The lower leaves of the plant suffered more seriously. If the disease spot expands, it can wither and die at the tip of the leaf. In the later stage of the disease, needle-like black spots can be seen on the disease spot, which is the conidium of the pathogen.

[incidence regularity and epidemic characteristics] the pathogen overwintered on the diseased tissue of the plant or on the diseased remains in the soil. The conidia are transmitted by Rain Water or sprinkler irrigation and invade the host by stomata.

[prevention and control measures] A. Cut off diseased leaves or diseased plants in time to reduce the source of infection. b. When growing in greenhouse, it should be ventilated to keep the leaves dry to prevent the spread of diseases. c. In early spring, Bordeaux solution (1) can be sprayed for protection; when the disease is serious, 1000 times liquid of Fumei Railway or mancozeb can be sprayed for prevention and treatment.