The purple bamboo disease of Yuzhu mainly damages the leaves of Yuzhu. The lesion was born on both sides of the leaf, round to elliptic, 2 to 5 mm in diameter, reddish in the early stage, gray to grayish brown in the posterior middle, and black dots on the upper part, which is the conidia of the pathogen.
Pathogens and Occurrence
The pathogen is Macrophoma cruenta Ferr. It is a subgenus of the fungus and a fungus of the genus Stenoflagella. The pathogens overwinter on diseased leaves or root buds with mycelia and conidia, and conidia are produced when conditions are appropriate for the following year, and the infection is caused by airflow propagation. From July to August, the onset of the disease.
Control methods
1 Thoroughly clean the pastoral area after harvesting; timely remove the diseased leaves in the early stage of disease, and concentrate them deeply or burn them out.
2 At the beginning of the disease, use 50% mancozeb 600 times solution, 70% thiophanate-methyl 800-1000 times solution or 50% vanillin 500 times solution to spray 2 or 3 times, with an interval of 15 days.
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