1、 What medicine is the most effective

It belongs to a kind of mite pest. It is relatively small, usually about 1mm. If you just find red spider erosion, you can move to a well ventilated place, pick the diseased leaves, and wipe the plant frequently with clean water. After a while, the plant can recover. If the pest is serious, you should spray it. Drugs can be dicofol, malathion, amitraz, etc. when used, it can be diluted 1000 times and sprayed. When there are many pests and general drugs can't control them, you can use 1000 times of 10% pyridaben or 3000 times of 5.7% methotrexate emulsion. The effect will be better after mixing

2、 How to prevent

1. Protection of natural enemies: there are many kinds and quantities of natural enemies of red spider, mainly including heterochromatic ladybug, small flower bug, bundle tube mite eating ladybug, deep point mite eating ladybug, phytosuis mite, large and small sandfly, etc. They can play a positive role in controlling the number of red spiders. Therefore, natural enemies should be protected during prevention and control

2. Improve the environment: red spider belongs to high-temperature activity type. High temperature determines its development cycle, yield and reproduction speed. Generally, it will occur in a large number in case of dry eye heat. Therefore, if you want to prevent and control, you should pay attention to environmental management. In high temperature and dry seasons, you must strengthen prevention and control