Sugarcane downy mildew
Symptoms mainly affect the leaves and stems. In the beginning of the disease, leaf-shaped yellow strips parallel to the veins were found on the leaves. After the strips increased, there were intermittent reddish-brown stripes. The diseased leaves were thin, and the leaves often had white molds, namely the cysts and spores of the pathogens. bag. The discolored parts of the leaf tissue gradually dry. The stems of the diseased plants were deformed and prone to lateral buds, fibrosis, sugar content, and water content.
Pathogen Peronosclerospora sacchari (Miyake) Shirai & Hara said that sugarcane refers to Aspergillus subtilis fungi. Synonyms Sclerospora sacchari Shirai et Hara said that sugar cane refers to the genus Pseudomonas, belonging to the flagellin subphylum fungi. The cyst stalks were solitary and the size of the upper swelled branches ranged from 160 to 17010 to 15 (μm). Sporocysts are elliptic to oblong in shape and range in size from 25 to 5415 to 23 (μm). The ovipositor is yellow-brown and its size ranges from 55 to 7349 to 58 (μm). The oospore is spherical and yellow and forms within the mesophyll tissue. The sporangia produce a suitable temperature of 22-25°C and a suitable relative humidity of 90%. In addition to damaging sugar cane, it can also harm corn.
Pathways and pathogenic conditions of the bacterium are oospore on diseased tissue in the soil or
Mycelium lurked in perennial roots. The sporangia of the following year were spread by wind and rain, irrigation water and insects. When the humidity is high, it germinates and invades from young shoots or young leaves of sugar cane.
Control methods (1) Selection of disease-free strains for planting. (2) Avoiding continuous use of perennial roots in seriously ill areas or serious disease areas. (3) The frequently affected sugarcane field is sprayed with 1:1:140 times Bordeaux mixture, 667m2 is sprayed with good liquid 100-150L, ​​and once every 7-10 days, total prevention is 2 or 3 times.
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