Peach? Cercospora shot hole (Peach? Cercospora shot hole), is a common disease of peach trees, each peach cultivation areas are distributed.
Symptoms? Peach tree leaves, shoots and fruits. A round or near-circular lesion occurs on both sides of the leaf. The border is purple or reddish-brown with a ring-like pattern with a size of 1-4mm. The late lesions grow brown-brown moldy material, and the middle part dries off and forms a perforation, perforated edges. neat. When there are many perforations, the leaves fall off. The shoots and fruits were infected and the symptoms were similar to those of the leaves, all producing gray-brown moldy textures.
Pathogen ??? Fungi, Deuteromycorrhizal subfamily Stemonosporidium æ ¸ ecoCecospora circumscissa SSacc.
Onset of disease? Mycelia with mycelium in diseased leaves or shoots disease overwintering, Hunchun temperature rise, after the rain produced conidia, spread by wind and rain, infestation of leaves, shoots and fruits. Later, the conidia produced by the diseased part were re-infected. Germ development temperature 7-37 °C, temperature 25-28 °C. Low temperature and more rain facilitate disease occurrence and epidemic.
Control methods
1 Strengthen Taoyuan management? Pay attention to drainage, increase organic fertilizer, trim reasonably, and increase permeability.
2 Chemical control After spraying, spray 70% mancozeb WP 500 times, 70% thiophanate-methyl ultra wettable powder 1000 times, 75% chlorothalonil wettable powder 800 times, 50 % Sulphur Sulphur Suspension 500 times, 7-lOd sprayed once, sprayed 3-4 times.
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