Purslane name Portulaca oleracea L. Also known as Mark, Horsegrass. It is an annual herbaceous plant of the purslane family and is used as a whole herb. With heat and dampness, cooling blood and toxic effects. Distributed in various provinces and regions throughout the country.
Symptoms Yellow patches appear on the leaves, the edges are not obvious, and the white backs grow on the back of the leaves. After the cracks are broken, white powder is scattered, which is the sporangia of the pathogen.
Pathogen Albugo portulacae (de Candolle) Kuntze. Called purslane white rust, which belongs to the flagellin subfamily fungus. Hyphae were born in the intercellular space, and the haustorium was small and round; hyphae gave birth to cysts under the epidermis of the host, short sticks, colorless, unit cells, size 20-8910-18 (μm), arranged in a fence; Cylindrical to elliptical powdery sporangia are produced, ranging in size from 11 to 2511 to 17.5 (μm). Sporangia can germinate in water droplets to release zoospores or germinate directly to generate germ tubes. After autumn, it produces thick. Wall of globular oospores; ovipositor colorless, transparent, size 63-10063-78 (μm); male lateral; oospore light brown to dark brown, spherical, with a reticulate, size 38-7535-75 ( Μm).
Transmission routes and pathogenic conditions The oocysts are overwintering on oospores on diseased leaves or in soil and on sick and sick bodies. When the spring conditions are suitable, germination invaded the purslane, and a large number of sporangia were generated after several days of onset. The spleen was transmitted through rain spattering and transmitted. The disease occurred in the northwest, north, and northeast from August to September, and it was relatively common. A lot of quantity and heavy humidity occur.
Prevention and control methods (1) Remove the diseased body in time for the end of autumn, and concentrate it deeply or burn it to reduce the initial infection source. (2) Spray 50% metalaxyl manganese zinc wettable powder 500 times or 64% antivirus M8 wettable powder 500 times, 40% triethylaluminum phosphate wettable powder 300 times, 72% cream Manganese zinc wettable powder 800 times.
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