How to prevent and cure angelica rust?

How to prevent and cure angelica rust? Please instruct Angelica stalk rust for summer spores oval to long oval, yellowish brown surface with small thorns, 3 germination holes. Teliospores oval to clavate, chestnut brown round at both ends, slightly constricted at septum; stalk colorless and can fall off. Monospore teliospores sometimes occur. 1. Harmful symptoms: damage to leaves, petioles and fruit stalks. Summer spores scattered or grouped on abaxial surface of leaves, bare, brown. Teliospore pile attached to both sides of leaves, bare, black. 2. the law of disease: the pathogen overwintered with winter spores on the diseased residual branches and leaves and on the roots and stems of plants in the field. The sexual spore organ will be formed in the spring of the following year, and a pile of summer spores and summer spores will be produced around it, infecting the newly produced leaves. Summer spores are transmitted by wind, rain and seedlings, and can be repeatedly infected. It spread rapidly under the condition of temperature 18 ℃ 22 min and relative humidity 75 mi 80%, and the disease was serious from July to August. 3. Control measures ① will clean up and burn the diseased leaves of the residual plants after harvest, so as to reduce the source of overwintering bacteria. After the onset of ②, the diseased plants were dug up in time, and the diseased plants were sprayed with Bordeaux solution of 1, 1 and 200 Bordeaux every 10 days, 3 times in a row. At the initial stage of the onset of ③, Baumei 0.2 degree stone sulfur mixture or 97% diuronic acid 400x solution was sprayed. Once every 7 days, spray 2muri for 3 times. ④ strengthens field management and improves plant disease resistance. Click to get more Angelica planting technology click to get more medicinal material planting technology