Symptoms are also called foot rot. It mainly affects stems, leaves, flowers, scales and bulbs. Stem infected with water, immersed brown rot, gradually expand upwards and downwards, aggravate stem rot, resulting in plant turnover or withered; leaves infected with primary water immersed small spots, expanded into large gray-green spots; flowers infected with a soft rot The bulbs became infected with water-soaked brown spots, which spread to decay, resulting in a sparse layer of white mold, the pathogenic sporangia and sporangia.
The pathogen Phytophthora cactorum (Leb.et Cohn) Schrotr said that Phytophthora viride is a flagellin subphylum. Synonyms P. nicotianae Breda var. Parasitica (Dast.) Waterh. Morphological characteristics refer to American ginseng disease.
Pathogens and Pathogens The pathogens live in the soil with chlamydospore or oospores as they remain in the soil. When the conditions are appropriate for the following year, crust spores or oospores germinate. The infestation leads to the onset of disease. The diseased part also produces sporangia and spores. After germination, zoospores or sporangia germinate directly to re-infest. The weather is humid and rainy, especially after each heavy rain, poor drainage, which is conducive to the occurrence and spread of the disease.
Prevention methods (1) The use of high-deep trenches or ridge cultivation requires that the surface of the sorghum should be leveled so as to promptly remove the accumulated water after the rain and find the diseased plants. The diseased plants shall be excavated and burned or buried deeply. (2) Application of enzyme composting or composting of organic manure, using formula fertilization techniques, appropriate application of potash fertilizer, and improvement of disease resistance. (3) Begin spraying 40% triethylaluminum phosphate wettable powder 250 times or 58% metalaxyl manganese zinc wettable powder 500 times, 64% antitoxicant wettable powder 500 times, 72% DuPont Wettable powder 800 times. The drug was stopped 3 days before harvest.
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