Control measures of Citrus foot Rot

Distribution and harmful symptoms: foot rot, also known as skirt rot, is a root and neck disease, which occurs in all citrus areas in China. It harms the citrus root neck and the main root cortex, and the diseased bark is brown with the smell of lees and often exudes gum. Under the dry strip, the disease part cracked and hardened, and the boundary between it and the healthy part was obvious. At the initial stage, it only damages the tree epidermis and then expands to the cambium and even the xylem. The disease spot spread vertically and horizontally to 20 cm from the ground, down to the root group, to the trunk ring cutting led to plant death, some or all of the leaves of the diseased tree were yellowed, and the diseased tree had more flowers and less fruit. The disease usually occurred from April to August, and the sweet orange rootstock suffered the most. Prevention and control methods can be divided into agricultural control and chemical control, and attention should be paid to other comprehensive measures. 1. Agricultural measures: ① uses disease-resistant rootstocks, which is the most economical and effective way to control the disease at present. ② strengthens cultivation management, timely digging drains, shallow planting, no intercropping of long-stalk crops, ring or trench application of organic fertilizer, non-dry application of chemical fertilizer, control of trunk pests. ③ replaced rootstocks, planted 3 or 4 disease-resistant rootstocks around seriously diseased trees, and then grafted them to the base of the trunk, combined with heavy pruning, digging rotten roots and topdressing outside roots. Second, chemical prevention and control: remove the soil from the root neck disease, scrape off the rotten part, and then apply "tree protection general" to make the disease spot fall off quickly and protect the wound to heal healthily. Third, do a good job in the drainage and irrigation system: prevent stagnant water in the orchard; at the same time, control longicorn beetles and bugs in time; when weeding in mid-tillage, we should avoid damaging the basal bark, which also plays a certain role in reducing the disease.