How to solve the red spider I spent?

Spraying should be timely, and spraying 40% dicofol with 1000 ~ 1500 times solution has good insecticidal effect, but it is ineffective for eggs; Spraying with 0.3 ~ 0.5 degree stone sulfur mixture can kill eggs; During the dormant period of flowers and trees, the overwintering female adults can be killed with 3 ~ 5 degrees sulfur mixture. Because red spiders do harm to the back of leaves, aim at the back of leaves when spraying drugs, and pay attention to spraying branches and leaves in the inner room.

Red spider is a kind of mite, which can occur for more than ten generations a year, especially under high temperature and drought conditions. When the temperature is above 30℃, it can reproduce for about 5 days. Puncture the leaves with mouthparts to absorb juice, and the chlorophyll in the injured leaves is destroyed. When the damage is serious, the leaves gradually turn yellow and fall off, or even the leaves of the whole plant fall off, which has a serious impact on growth.

Extended data

1. Soak orange peel in water for about 10 times, soak for one day and night, filter and spray on plants to prevent red spiders and aphids. If it is used to water flowers, it can prevent nematodes in the soil.

2. Washing powder 15g, 20% caustic soda 15ml, and 7.5kg of water. After mixing evenly, spray. After a day or two, the mortality rate of adult spider and nymph mite is 94% to 98%.

3. Take 50g of plant ash, add 2,500g of water, fully stir it, soak it for two days and nights, filter it, add 3g of washing powder, and then spray it once a day 1 time, for three days in a row, every other week, which can kill the second generation pests, and also control sucking pests such as aphids, red spiders and scale insects, and put it into the soil to control maggots.

4. Put a plate of lighted mosquito-repellent incense in the sick plant basin, and then tie the basin tightly with a plastic bag. After an hour or so of smoking, both adults and eggs can be killed. This is a good way to save money and get quick results.

References:

China Forestry Network China Dianthus Flower Network-Extreme Prevention of Common Diseases and Pests in Flowers.