Hibiscus flower, when it appears pests and diseases, many people do not know how to deal with it. In fact, different diseases have different pesticide control methods. The following are several pesticide treatment programs for common pests and diseases.
Pesticide control scheme for wood hibiscus powdery mildew:
It is mainly harmful to the leaves. When the damage is serious, the plants may be weakened and the leaves may turn yellow and prematurely dry. In the early stage of the disease, many small spots appeared on the front of the leaves, and then the small spots merged into white powdery spots with no obvious edges. In the autumn, the black and brown small particles may be produced in the white powder.
Control methods: a. Remove the diseased plants and burn them in the late autumn; b. Spray with 25% of the powdery rust 2000 times solution or 70% of the thiophanate-methyl WP 1500 times solution.
The pesticide control scheme of the spotted spotted moth: the larvae of the biological pesticides are clustered on the back of the leaves, feeding the mesophyll and leaving only the epidermis, the 3rd instar larvae are scattered and feeding, and the mature larvae are crusted and licking on the back of the leaves; before winter, 3 The larvae overwinter under the bark.
Control method: a. Winter can scrape the wintering larvae under the bark; b. Use 20% permethrin emulsifiable concentrate 2500 times solution or 20% fenvalerate 2500 times solution in the middle and the middle of June, or 90% trichlorfon 1000 times liquid spray.
Pesticide control program for small green leafhopper:
The adults and nymphs suck the sap of the plants, causing the white leaves to appear in the damaged leaves. In severe cases, the whole leaves are pale and early leaves, which affects the normal growth and ornamental value of the plants. Adults lay eggs in the main veins, new shoots or petioles of the back of the leaves. The nymphs inhabit the back of the leaves, and they are good at jumping and having a habit of doing horizontally.
Control methods: a. Remove weeds around plants, eliminate wintering places, reduce the number of insect bases in the second year; b. Before the first peak period, use 50% chlorpyrifos, 50% neothion, pyrethroids 1500 times each of the pesticides, or 50% malathion 1500 times solution or 40% chlorpyrifos 1500 times solution spray.
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