Symptoms mainly occur in the field, and damage roots or other underground parts. The diseased plants showed chlorosis, and the mycelium of pathogenic bacteria was found on the roots and stem bases, white or purple-brown, like a spider's web, and the symptoms were obvious. Roots from the bottom up, rot from the outside to the inside, after only the remaining shell, the skin of the roots of the fibrous roots easily fall off.
The pathogen Helicobasidium mompa Tanaka is called mulberry fungus and belongs to Basidiomycotina fungus. Synonyms Helicobasid-ium purpureum Pat., sub-solid purple. The burden is cylindrical and colorless, producing spores on it. The spores are long ovate, achromatic cells, size 10 to 256-7 (μm). The anamorphic state is Rhizoctonia crocorum Fr., called Rhizoctonia solani.
Transmission routes and pathogenic conditions Germs, mycelia, rhiform bacteria, and sclerotia are overwintering on the roots or in the soil. When the conditions are appropriate, the mycelium formed by the mycelium and sclerotia and the mycelium that is formed by the assembly of the mycelium will extend into the soil and be invaded by contact with the host root. Generally, the soft tissue that infects the new root first, After the spread to the main root. In addition, mycelium, sclerotia, etc., which are in contact with the roots of the roots or are dropped from the roots into the soil, can also be transmitted by soil and running water. Although the bacterium can produce spores but has a short lifespan, there is less chance of infection after germination. In the low-lying, wet and stagnant areas
Control methods (1) Strictly selected land should not be planted in mulberry field, orchard and soybeans, hawthorn and other places where purple streak disease has occurred. It is best to choose grassy cornice. (2) Promote the application of enzyme-compounded compost. (3) The diseased plants were found to be excavated and burned in time, and the surrounding soil should also be disinfected or watered with 20% lime water. (4) In the initial stage of disease, ditch the barriers around the diseased plants to prevent mycelia, bacteria and sclerotia from spreading and spreading with the soil or flowing water. (5) Remove the cultured Trichoderma around the diseased roots, if combined with a fungicide spray better. (5) Spray or water 36% thiophanate-methyl suspension 500% or 70% thiophene WP 700 times, 50% benomyl WP 500 times in the early onset.
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