Medicinal plants yam speckled disease
Hill Pharmaceutical Name Dioscorea opposita Thunb. Alias ​​"Yatake", for the Dioscorea vine, with dry roots medicine. With qi, kidney essence, stomach and phlegm effect. Distributed throughout the country.
Symptoms are also known as yam white astringent disease, Physalospora pulmonalis brown spot. The main damage leaves and vines, the first disease of the lower leaves of the plant, the primary yellow-white edge of the lesion is not obvious, after the expansion, due to the limitations of the veins, irregular or polygonal, the size of 5-10mm, after the disease class turned brown slightly Prominent, light brown in the middle, scattered black small particles, namely the pathogenic conidia plate. Severe lesion fusion, resulting in perforation or dead leaves.
Pathogen Cylindrospoium dioscoreae Miyabe et S. It0. called the cyst of P. ostreatus is a fungus of the subphylum Fungi. The conidia disc was born on both sides of the leaf and was buried at the beginning, connate or scattered, with a size of 200-250 μm conidial stem linear-cylindrical, colorless, unit cell, straight or slightly curved, unbranched, size 20-252 —2.5(f4m); Conidia needles, rounded at either end or pointed at one end, straight or slightly curved, single cell, without septum or with few septa, colorless, transparent, 37--402.5-3 (μm). Injury potato dumplings.
Transmission Pathogeny and Pathogenic Conditions Germs with conidiospores or mycelia overwinter on sick bodies become the source of infestation at the beginning of the year, and conidiospores are produced after the onset of disease. In case of suitable conditions of temperature and humidity, they can be submerged for 1-2 days. Fertility, conidia germination can be re-infection. The disease usually begins in mid-July and late July, and heavy in August, continuing until harvest. Humidity and heavy rainfall are serious.
Prevention methods (1) Rotation is performed to avoid continuous cropping. (2) Dispose of the diseased body promptly after harvest, concentrate deep or burn, and reduce the initial infestation source. (3) Advocate the use of compost made from fermented bacteria. (4) Spraying 30% Basic Copper Sulfate Suspension 400 to 500 times or 1:1:200 to 300 times Bordeaux, 77% to kill the wettable particulate powder 500 times, 50% for the first time from the beginning of June. Double powder 500-600 times liquid, every 7-10 days 1 time, continuous control 2-3 times.
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