Prevention and treatment of black shank disease of geranium
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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Black stem rot of geranium
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
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Winter maintenance of geranium
The geranium likes to be warm in winter and cool in summer. It can blossom normally when the indoor temperature is kept at 15c in winter and the temperature is above 8 ℃ at night. But the optimum temperature is 15-20 ℃. Geraniums like dryness, hate dampness, watering in winter should not be too much, should be dry and wet. When the soil is wet, the stem is tender, which is not conducive to the sprouting and opening of flower branches; long-term excessive humidity will cause plants to grow too long, flower branches will move up, and the leaves will gradually yellow and fall off. Geraniums need plenty of sunlight for a long time, so they must be placed in the sun in winter. Lack of light will lead to long stems and leaves.
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