MySheen

Prevention and treatment of black shank disease of geranium

Published: 2024-11-22 Author: mysheen
Last Updated: 2024/11/22, The symptom of this disease occurs on both cuttings and adult plants, and the damage of cuttings is more serious, which begins to rot from the base of the stem, develops upward, and causes death. After the onset of the disease, the adult plant turned black and expanded upward, and the leaves fell off, so that the whole plant withered and died. The pathogen Pythium ornate [PythiumsplendensBraun] belongs to the subphylum flagellum. The hyphae are well developed, branched, without septum, and show white cotton floc shape when the growth is exuberant. The sporangia are filamentous, round or subrounded, producing zoospores and causing infection.

The symptom of this disease occurs on both cuttings and adult plants, and the damage of cuttings is more serious, which begins to rot from the base of the stem, develops upward, and causes death. After the onset of the disease, the adult plant turned black and expanded upward, and the leaves fell off, so that the whole plant withered and died.

The pathogen Pythium ornate [PythiumsplendensBraun] belongs to the subphylum flagellum. The hyphae are well developed, branched, without septum, and show white cotton floc shape when the growth is exuberant. The sporangia are filamentous, round or subrounded, producing zoospores and causing infection.

Prevention and cure method

1. When cutting, the branches on the healthy plants should be cut and cut in the seedbed free of pathogens.

2. When transplanting, it is necessary to change a new lot or change the basin soil to prevent the spread of diseases. If necessary, 1000-1500 times of the liquid of 70% dimethazone wettable powder can be poured on the soil surface.

 
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