Rose rust prevention method
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October 09 13:04:37, 2024
First, the incidence of symptoms of rose rust is the main disease of roses, occurs in all parts of the southwest, warm seasons, heavy rain in winter and more misty areas, according to my many years of investigation, in some areas in our province, the incidence rate of 80%. White flowers and purple roses are all infected, causing the leaves to fall off, affecting growth and flowering, and also endangering a variety of plants of the genus Rose, which infects leaves, petioles, calyces, and tender stems. Yellow dots or oranges appear on the front. Polygonal lesions showed many apricot-yellow powders on the opposite side of leaves in June and July. The lesions on the petioles and shoots were yellow knobs. This is its "summer spores," spread by wind and rain. The pathogens are basidiomycotina, rust, and rosophila. The pathogens overwinter in the diseased part and fallen leaves of the winter spore heap. Second, control methods 1. Artificial control, timely removal of disease buds, diseased leaves and burned in order to reduce the spread of pathogenic bacteria. 2. Strengthen cultivation and management, increase phosphorus and potassium fertilizers to enhance resistance; pay attention to ventilation, light and drainage, to reduce the humidity of the surrounding environment and reduce the incidence of conditions. 3. Chemical control, spraying once every two weeks between May and August 1∶1: 150 ~ 200 times Bordeaux mixture, Baume 0.3 degree lime sulfur mixture; also can use the following pesticides to spray: 97% diene sodium 250 ~ 300 Double liquid (add 50 to 100 grams of soap powder per hundred pounds of liquid medicine), 20% triadimefon (triadonine) 2000 times liquid wettable powder, 30% green deterrence 300 to 400 times liquid, 10% water dispersion Granules 3000 ~ 5000 times, 25% Fuxing EC 5000 ~ 8000 times, 30% Tefu WP 3000 ~ 5000 times and so on.