How to treat chrysanthemum white rust disease
About the knowledge of chrysanthemum in this floral clinic, how to treat chrysanthemum white rust disease, the following editor will explain in detail for you
Chrysanthemum white rust disease has the characteristics of rapid development, wide spread, and serious harm. Once infected, cut chrysanthemum almost completely loses its ornamental and commercial value, especially among cut chrysanthemum growers, it is known as "talking about rust color change."
Symptoms of the disease
Small discolored white spots first appear on the back of the infected leaves, then become raised and turn into grayish-white pustule-like protrusions. The waxy powder gradually turns into a light brown color, while the front of the leaf shows light yellow to yellow-green spots that are slightly sunken. When the disease is severe, the entire leaf is covered with lesions, causing early leaf death. If not controlled properly, it can lead to large-scale occurrences.
Lifestyle and occurrence conditions
The pathogen can survive at temperatures between 5°C and 35°C, with the most suitable temperature being 12°C to 24°C. It is difficult to germinate above 24°C, so it occurs less frequently in summer. High humidity above 85% is very conducive to the occurrence and transmission of the disease. The pathogen is sensitive to strong light, and it occurs very severely under weak light. Therefore, it is highly likely to occur in the early spring, in closed greenhouses with poor ventilation, and in environments with continuous rainy weather. (Information from the internet)
Prevention methods
According to the habits of the pathogen, before the onset of autumn and winter, clear away withered branches and ground weeds, eliminating most of the disease sources.
Planting density should not be too dense, increase lighting, and maintain good ventilation (this method can also prevent the outbreak of aphids, many flower friends complain about frequent aphids, this is also an important reason).
Treatment after onset
Especially in the wet spring rain in the south, it is necessary to detect and remove the diseased leaves in a timely manner.
Apply fungicides such as Mancozeb, Thiophanate-methyl, Carbendazim, and Chlorothalonil.
This article shares the comprehensive knowledge on how to treat chrysanthemum white rust disease, hoping to help you.