Papaya tree cultivation: how to prevent and cure papaya rust?

How to prevent and cure papaya rust? What harm does papaya rust have? What methods can be used to prevent papaya rust? Please introduce the harm of papaya rust: after the leaves are damaged, they produce glossy orange spots, which gradually expand into round spots of about 5 mm, and produce yellow mucus. The back of the leaf is raised. And produce gray-yellow hair, when the leaf disease spot reaches 5-7, often premature senescence and early fall, even the whole garden light, sometimes also cause fruit drop. The cause of papaya rust: papaya rust overwintered with perennial mycelia in pine and cypress galls and produced basidiospores after spring rain and dispersed with wind and rain. From the stage of papaya tree germination to young fruit formation, the spores scattered on the young leaves, new shoots and young fruits, and invaded directly from the epidermal cells or stomata. Orange disease spots appeared on the leaves after 6-10 days of incubation, and burrs were formed in 20-25 days. The spores produced from the spores no longer infect the papaya tree, but invade the young leaves and shoots of the transferred host pine and cypress, and oversummer and winter on the pine and cypress. The severity of the disease is related to the number and distance of pines and cypresses. The effective distance of spore transmission of rust fungus is generally 5-10 km, and the disease has the greatest relationship with the pine and cypress within 1.5-3.5 km from the papaya garden. When papaya sprouts to the early development of young leaves, if the weather is rainy all the time, and the temperature is suitable for winter spore germination, it is beneficial to the disease. Prevention and control methods of papaya rust: 1. Remove the transferred host and cut off the sporadic pines and cypresses planted within 5 kilometers around the papaya garden to cut off the source of the pathogen. Control methods of papaya rust 2. Spray protection about one month after sprouting to leaf spreading, generally spraying 3 times before flowering, after flowering and young fruit stage. The commonly used medications are 1 Vera 2 Vera 240 Bordeaux solution, 20% trimethoprim EC 2000 times, 14.5% Duoxiaoling 600% 800 times, which has a good effect on the control of the disease. Click to get more papaya tree planting techniques click to get more fruit planting techniques