In the process of growth, peony is vulnerable to black spot disease, white peony disease, rust, and pests and diseases such as cockroaches, mites, and spider mites, and must be strengthened.
In the initial stage of black spot disease, spraying 65% dexamethasone WP 500 times, which has a certain effect; After the onset of the epidemic, it is sprayed once every 7 to 10 days to prevent and treat with equal amount of Bordeaux mixture until the autumn. Although this can not cure the disease, it can relieve symptoms; it can concentrate on burning dead branches and diseased branches; it can sterilize the soil with 1-100 formalin solution; it will not be continued for 3 to 4 years.
The soil was replaced or disinfected by the disease; the diseased plants were cut off at the beginning of the disease and burned in a concentrated manner. The surrounding soil of the diseased plants was watered with mercury, lime, and water (1:1.5:1500); more than 50% of the soil was sprayed regularly before the onset of disease. Diosperm wettable powder 500 times or 50% thiophanate wettable powder 500 times.
Rust regularly spray 65% ​​zeocin zinc wettable powder 500 times liquid or lime sulfur 0.3 to 0.4 degrees liquid, spray once every 10 to 15 days, continuous spray 3 to 4 times, can achieve certain results.
In early spring, 1% of trichlorfon solution or 20 to 30 grams of carbofuran per square meter is used to irrigate the soil; deep-turning the land to make the overwintering eggs freeze to death.
The mites eliminate overwintering weeds; when the hazards occur, spray 40% dimethoate emulsion 3000 times.
Red spider weeding, composting, elimination of overwintering eggs, reduction of insect pests in early stages; spraying 20% ​​triclosan wettable powder 1000 times or 40% dicofol emulsion 2000 times; spraying Baume 0.2 to 0.3 degrees in summer Sulfur mixture, from 6 to 7 days after spraying, needs to be sprayed once more, and spray water to clean the blades in time.
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