MySheen

Black stem rot of geranium

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, Pelargonium black stem rot is a disease that occurs in the stem of pelargonium, which causes the stem of the plant to rot, so that the whole plant wilts and dies. Symptoms: the disease occurs on both cuttings and adult plants. The susceptible cuttings began to rot from the base of the stem, and gradually developed upward, resulting in death. After the onset of the adult plant, the diseased part became black, rotted, gradually developed upward, and finally the leaves fell off. when the disease was serious, the diseased part cut the stem around, resulting in the death of the plant. Pathogen: the pathogen is Pythiumsplendens

Symptoms: the disease occurs on both cuttings and adult plants. The susceptible cuttings began to rot from the base of the stem, and gradually developed upward, resulting in death. After the onset of the adult plant, the diseased part became black, rotted, gradually developed upward, and finally the leaves fell off. when the disease was serious, the diseased part cut the stem around, resulting in the death of the plant.

Pathogen: the pathogen is gorgeous Pythium (PythiumsplendensBraun), which belongs to the subphylum flagellum, oomycetes, downy mildew and Pythium.

The law of disease: the pathogen survives in the soil as oospores. When the conditions are suitable, the oospores germinate and produce germ tubes to invade the host. Zoospores and zoospores are produced on susceptible hosts, and zoospores can be re-infected.

Prevention and treatment: ① in the disease-free seedling bed, the use of disease-free branches cutting. When ② is cultivated, it is necessary to change the new area or basin soil, and disinfect the soil if necessary.

 
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