Peony pest control
Paeonia anthracnose symptoms: leaves, petioles and stems can be infected. Leaf lesions were initially oblong and then subsided slightly; after a few days, they expanded into large dark brown irregular lesions that were not plastically deformed. When the weather is wet, a pink sticky spore heap appears on the surface of the lesion, which is a mixture of pathogenic conidia and glial. In severe cases, the diseased leaves droop and the spore piles of dense foliage pathogens. The lesions on the stems are similar to those on the leaves and can cause them to fold when they are severe.
Pathogens: The pathogen of peony anthracnose is Gloeosporium sp. The conidia discs are disc-shaped, buried under the surface of the host and exposed afterwards. Conidia are oval or cylindrical.
Infection route: The mycelia overwinters on diseased leaves or diseased stems, and the conidia discs produce conidia in the following year. They spread through wind and rain and invade the wound. In August-September, the incidence of heavy rainfall was heavy. The pots were placed too densely and the watering was improper. For instance, watering in the evening would make the water easily retained on the leaves. The beneficial conidiospores were fused and germinated and invaded.
Control methods
1, clear the source of the disease: disease during the timely removal of diseased leaves to prevent re-infection damage. In the autumn and winter, the ground sicknesses, together with the remaining branches and leaves, were completely removed, and high-temperature rot was concentrated to reduce the source of infection in the early next year.
2. Chemical control: Spraying is best at the beginning of the disease. Common agents can be used: 80% anthrax omeprazole WP 800 times; 50% carbendazim WP 500~800 times; 50% thiophanate-methyl wet Powder 500~800 times; 365 methyl thiophanate flotation 500 times; 50% polysulfide suspension 500 times. Spray once every seven or eight days, spray two or three times, spray the spray after the rain. Can also be used 75% chlorothalonil WP 1000 times plus 70% thiophanate-methyl WP 1000 times, the control effect is better than a single use.
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