1、 How

Avocado root rot is mainly caused by root damage. There are many reasons for the damage, such as flooding the root caused by too much watering, burning the root caused by too thick fertilizer, or accidentally cutting the root when loosening the soil. For rotten roots, if the situation is relatively minor, there is no need to take off the pot and trim, as long as daily maintenance is done and proper medication is used. If the situation is serious, you need to take the plant out of the basin, cut off the rotten roots with sterilized scissors, and replant it after the wound is dry

2、 Common diseases

1. Anthrax: one of the common diseases of avocado. It mainly damages the fruit and can also infect leaves and twigs. The disease will lead to fruit drop and fruit decay. In the early stage, the disease spot is round, with a diameter of no more than 5mm and slightly concave. After that, it will expand quickly, the disease spots will be connected into pieces, and the pulp will rot. If you want treatment, you need to cut off the diseased leaves and store the fruits at low temperature after picking

2. Scab: after the disease, the avocado fruit will appear Brown bulge, and then turn light purple. As the fruit matures, the disease spots will be connected, the center will be sunken, and the peel will be rough. Although this disease will not affect the taste, it doesn't look good. After the disease is found, the diseased branches and leaves shall be cut off in time, and they shall be destroyed in a centralized manner, and the Bordeaux liquid and other chemicals shall be sprayed for control

3. Cercospora spot: this disease mainly damages leaves, stems and fruits. Diseased leaves will appear brown spots, and then turn purple and irregular in shape. Diseased fruits can cause the epidermis to crack, making it easier for other bacteria to invade. Chemical control is generally used. Copper preparation and azoxystrobin can be sprayed on the branches, so that treatment can be carried out