How to control citrus canker by falling leaves and fruit branches

Citrus canker, one of the main diseases of citrus, is not only harmful to leaves, but also to branches and citrus fruits, causing defoliation, fruit drop and branch death, weakening tree potential and reducing citrus yield and quality.

Citrus canker

Prevention and control methods:

(1) strictly carry out citrus quarantine. It is strictly forbidden to introduce diseased seedlings, scions and oranges into disease-free areas and burn them thoroughly once they are found.

(2) to establish disease-free area and cultivate disease-free seedlings. Choose a place with strong isolation as a nursery, and it is forbidden to transfer seeds and scions from the disease area.

(3) in the disease area, the diseased branches and leaves should be cut off and the litter of citrus on the ground should be removed so as to eliminate the pathogen. During the citrus growing period, spray protection. The seedlings and young trees of citrus were sprayed once 20 and 30 days after shoot germination in spring, summer and autumn. The fruiting citrus trees should be sprayed once before flowering, after Xiehua and after summer and autumn shoots.

The main agents are: 0.5 ∶ 1 ∶ Bordeaux solution, 50% citrinin 500 Mel 1000-fold solution, 25% dicyclozole 500-Mel 1000-fold solution, 50% bacillus or 50% Dysenamine 500 Mel 800-fold solution, 20% synergistic double-acting phosphorus 600-Mel 800-fold solution, etc.

(4) controlling the shoot outgrowth in summer and autumn and keeping the shoot period consistent, the branches and leaves of citrus damaged by leaf miner cause wounds and provide conditions for pathogen invasion, so the damage caused by leaf miner will aggravate the occurrence of citrus canker. Focus on the control of leaf miner, planting disease-resistant citrus varieties.