Dead stem disease caused by pathogenic fungi infects shoots or old branches of camellia. The affected shoots are necrotic, and the leaves turn from green to yellowish. The leaves gradually dry off from the top, and finally the whole branch shoots dry and die.
Control methods Cut off dead branches in winter and burn them in a concentrated manner; remove redundant adventitious buds and thin and weak branches to reduce the breeding grounds of pathogenic bacteria; spray 50% thiophanate-methyl 800 times, or 50%, before budding shoots of camellia plants. Fumei double 800 times liquid, or 50% chlorothalonil 600 to 700 times liquid, focus on spraying wounds on branches, after the onset of the use of the above agents alternately spray; pay attention to increase the appropriate amount of phosphorus, potassium fertilizer, less nitrogen fertilizer.
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