What are the symptoms of geranium root cancer?
The manifestation of geranium root cancer disease: mainly occurs in the rhizome, lateral roots also occur sporadically. Tumors of different sizes and shapes are formed at the injured sites. Usually spherical or oblate, can also be connected to each other as amorphous primary nodules, grayish white or fleshy, soft, smooth surface, and then gradually turn brown to dark brown woody nodules. The surface of the woody nodule is rough or uneven and cracked. The diseased plants had poor root system, few fine roots, slow growth, yellowing of leaves and early fall.
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How to prevent and cure pelargonium brown spot?
Prevention and treatment of geranium brown spot: first, the collection and burning of diseased and residual tissue is the key to the prevention and treatment of the disease. Pots or borders should avoid stagnant water and wet environment. Second, spray 50% carbendazim 800 to 1000 times or potassium permanganate 1500 times before and after the attack, once every 10 days, 2 to 3 times in a row.
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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, then 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).
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