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Second, pathogenic yellow skin anthrax pathogen is Colletotrichum gloeosporioides Penz, is a semi-known fungi subphylum. The small black spots of the diseased part are its conidium discs, and the orange red viscous spores are conidial spores. Conidia are oval or cylindrical, single-celled, colorless, with an oil droplet inside.
Third, the infection cycle, disease conditions yellow skin anthrax bacteria with mycelium and conidia plate in dead branches, diseased leaves, diseased fruit and other diseased body overwintering. The next spring encounters suitable temperature and humidity conditions, will form a large number of conidia, through the rain and rain for the initial infection. Anthracnose pathogen is a typical latent infestation pathogen. The pathogenic bacteria invade the tissue from the flower organ and young fruit, and then the disease occurs when the fruit matures, causing fruit rot. High temperature, rainy and humid weather are most suitable for the occurrence of anthrax; poor orchard management, weak plants, and severe disease.
Fourth, control methods
1. Strengthen the cultivation and management After the fruit is harvested, soil plowing should be carried out, organic fertilizer should be added, and the disease resistance of fruit trees should be improved.
2. Remove the source of overwintering bacteria in winter should be thoroughly pruned, remove the diseased branches, diseased leaves and diseased fruit, and collect the leaves burned, spraying a 40% extermination Weiwei glue suspension 500 times.
3. The spray protection of spring shoot stage, flowering period and young fruit period is an important period of anthrax infestation, and it is necessary to carry out drug protection. There are 50% carbendazim WP 500 to 600 times; 70% thiophanate-methyl WP 800 to 1000 times; 65% Zn WP 50 times or 40% EV 500 times solution.
Symptoms and control of yellow skin anthrax
First, the symptoms of yellow skin can be infected with anthrax during each growth period, resulting in leaf spots, leaf rot, branches, fruit rot. Leaf spotted leaves form round or semi-circular lesions in the center and edges of the leaves. Diameter 1 to 2 mm. Several small spots can merge into one large spot. The middle of the leaves is gray, and the lesions are stained on the edges. Obviously, in the later stages of the disease, there are many small black spots (ie, the conidia plate of the pathogen). Leaf rot disease mostly occurs from the tips of leaves and leaves. The diseased part is brownish and rotten. The disease rapidly expands. There is no obvious boundary between diseased and healthy parts, and within a few days, the whole leaf rots. The petiole suffers from browning, resulting in premature leaf blight. The branches and branches of the branches were brown and necrotic, and the necrotic parts were grayish white, with many small black spots on the top. Fruit rot on the victim's fruit surface, initially formed water-stained brown spots, later expanded into round lesions, diseased parts were brown rot, slightly sag, surface dense orange red spores (spore of pathogenic bacteria) Mature fruit is heavier than young fruit.