How to prevent and cure geranium root cancer?
Prevention and treatment of geranium root cancer: first, diseased plants were found to be removed before planting. If necessary, disinfect the stem base of the seedling, soak it in 1% copper sulfate for 5 minutes and then move it to 2% lime water for 1 minute. Second, the soil without root cancer disease was selected as nursery soil and basin soil. Potted plants should be replaced with disease-free soil. Third, the newly diseased plant can be cured by removing the cancer with a knife, smearing the wound with the residue of stone-sulfur mixture or Bordeaux pulp, or with methyl iodine solution (50 parts of methanol, 25 parts of glacial acetic acid, 12 parts of iodine tablets). According to foreign reports, injection of penicillin, streptomycin, chlortetracycline and oxytetracycline into diseased plants also has therapeutic effects. Fourth, properly increase the application of acidic fertilizers such as ammonium sulfate to adjust the pH of the soil and make it disadvantageous to the occurrence of diseases. Fifth, cure insects and prevent diseases, avoid all kinds of wounds and prevent bacteria from infecting.
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What are the symptoms of geranium root cancer?
Pelargonium root cancer disease performance: mainly occurs in the rhizome, lateral roots also have sporadic occurrence. The victim forms nodules of varying sizes and shapes. They are usually spherical or oblate, but can also be connected to each other as amorphous primary nodules, gray or fleshy, soft in texture, smooth in surface, and gradually change into brown to dark brown lignified nodules. lignification tubercle surface rough or uneven, cracking. The root system of diseased plants is poorly developed, with few fine roots, slow growth, severe leaf yellowing and early drop.
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How to manage geraniums in winter
Geraniums like temperature and are afraid of cold. Special attention should be paid to preventing cold and freezing in winter. When raising geraniums in the northern region, the pot plants should be moved indoors and placed in front of sunny windows when Frosts Descent arrives, so that they can fully receive the light. If there is not enough light, the plant is easy to grow, affecting the formation of flower buds, and even the formed buds will wither due to lack of light. If you are in the south, you should also move the pot plants to the place of shelter from the wind and keep warm in the sun after the Beginning of Winter, which is not only convenient for potted flowers to bask in the sun, but also easy to avoid the wind and cold. Indoor temperature should be kept at a daily temperature of 15 ℃ to 20.
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