The methods for controlling pests and diseases of day lily are as follows:
The main diseases of the diseases and insect pests of day lily are rust, leaf spot and leaf blight, all of which are fungal diseases. Mainly endangering leaves, rust can also damage flower stems and flower stalks. Rust is controlled by powder rusting spray, and leaf spot and leaf blight are controlled by carbendazim or thiophanate spray.
The main pests of the needles and diseases of the day lily are aphids and red spiders. The former harms young leaves and flower buds, and is sprayed with 2,500 times spray of deltamethrin or flupentin; the latter is concentrated in the back of the leaves, and is sprayed with dicofol or amitraz. The drug was stopped 10 days before the picking.
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