Medicinal Plant Peppermint Downy Mildew

Symptoms mainly affect the stigma and filaments of leaves and flower organs. Foliar lesions are light yellow to brown, polygonal, and when the humidity is high, the leaves and back moldy plexuses are dense and pale blue-purple.

Pathogen Peronospora menthae X. Y. Cheng et H. C. Bai called mint mildew, a flagellin subphylum fungi. Cystic stalk ovoid, slightly smaller, erect, scattered or clustered, colorless or slightly grayish, size 291-4977-14 (μm), acute angle bifurcation branches 6-8 times, top asymmetry, Tips slightly curved, size 10-18.51.9-2.5 (μm); sporangia oval, light purple-brown, size 21.5-45.520-44 (μm), no oospore . In addition, peronospora stigmaticola Raunk is called smuthead downy mildew, which is also the cause of the disease. The cyst stems are colorless, oblong, larger, extending from the stomata, solitary or clustered, size 272.7-313.15.0-10.1 (μm), the base does not inflate, the length of the main shaft is full-length l/2-2/3, the upper part with bifurcation branches 3-5 times, the end branches are curved, tip, long l0.5-12.0μm; sporangia light gray, no mastoid, size 20.7- 46.310.5—14.7 (μm); oospore yellowish-red, globular, size 30.3-40.4μm; ovipositor nearly spherical, size 50.5-60.6μm. The former mainly damages the leaves and forms leaf spots. The latter harms the flowers, especially the stigma and filaments.

Transmission Pathway and Pathogenic Conditions The pathogenic bacteria were infected with pathogenic seeds or oospores on infected diseased plants. The pathogenic female root borne pathogens infested with the growth of new leaves in the following year became the primary source of infection. When the humidity is high, zoospores can be produced, spread by rainwater or irrigation water, zoospore germinate in water droplets, and invade directly from the epidermis to the leaf parenchyma by the germ tube, resulting in the expansion of mycelium between cells and the production of lines. The spherical suctioner penetrates the host cell wall and draws nutrients and substances. The temperature is 16°C and relative humidity is 75%. The incubation period is the shortest, and it will produce a large number of sporangia, which will expand the disease. Nitrogen fertilizer production on the production of excessive incidence.

Prevention methods (1) Strengthen quarantine to prevent the spread of the disease. (2) At the beginning of the disease, attention should be paid to the removal of the diseased plants, and they must be buried or burned. (3)Initial spraying begins with spraying 30% of green suspension suspension 300-400 times or 1:1:100 times of Bordeaux mixture, 40% of triethyl aluminum phosphate (Shuanglian Ling) wettable powder 250 times, 58% Metalaxyl. Manganese zinc wettable powder 500 times, 64% antivirus M: 500 times wettable powder, 72% DuPont Kelu wettable powder 800 times, every 7-10 days, continuous control 2-3 times. The resistance to the above-mentioned fungicides can be changed to use 69% Anke manganese zinc wettable powder 1000 times.

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