Fungi Snake Eye Recognition and Pathogenesis

Snake eye disease, no matter whether it is in the protected area or in the field, is common. It is a serious disease and it is an important disease of the fungus.

First, symptom recognition

The disease mainly damages the leaves and begins to have a purple-brown lesion. Later, the lesion develops into a round or near-circular shape. The central part is gray-brown or yellow-brown. The edges are purple brown, a little concave, and film-like, due to its thinness. In the end, it is easy to break the perforation, and there are no obvious small black spots on the lesions. In severe cases, the entire leaf is covered with lesions, losing the commodity value and being inedible.

Identification points: the edge of the lesion is purple-brown, gray-brown or yellow-brown in the middle, showing a membrane shape, easy to break in the later period, and there are not obvious small black spots on the lesion.

Second, the incidence of the law

1, the pathogen of fungus dish snake eye disease is caused by the fungal colon of Cercosporasp. The conidiophores are light brown, thick and short, and the conidia are linear, colorless or light in color.

2. The onset of the disease The pathogenic bacteria are mycelia or conidia that have survived the overwintering on the soil surface with the remains of the diseased bodies (in the southern warm areas, the annual damage is caused; there is no overwintering problem). When the environmental conditions are appropriate in the second year, the mycelium produces conidiospores or conidia for initial infection. After the onset of disease, a large number of conidia are produced in the diseased area and transmitted by airflow or rainwater or irrigation water for reinfection.

3, the occurrence of conditions

(1) The relationship between onset and temperature and humidity The temperature is more than 20°C and it is easy to develop; however, the key is humidity, which requires high humidity. If the humidity is long, the onset is serious.

(2) The relationship between the disease and cultivation The incidence of disease replantation is heavy; In addition, low-lying land, water accumulation after rain, poor drainage, watering, over-water irrigation, or planting too dense, and the protection area does not release air, shed, High indoor humidity is conducive to disease development and serious diseases.

(3) The relationship between disease and rainwater is severe if there are more years of rainfall, or frequent rain in spring and autumn.

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