Cabbage grown in our gardenscan be affected by numerous fungal diseases that cause discoloration, rot and mold on cabbage heads. This problem affects white, red and Italian cabbage as well as Chinese cabbage, anddiseased heads of cabbagecannot be eaten. Here are the most commoncabbage fungus diseasesand ways to fight them.
Fungal diseases of cabbage - yellowing and stains on leaves
Fig. depositphotos.com
Gang of cabbage seedlings
"Disease of seedlings, also called black leg, is acabbage disease that occurs during the emergence and production of seedlingsCan be caused by many different fungi that attack other vegetables as well. This disease manifests itself in the mass death of germinating seeds before emergence or the death of seedlings after emergence. Disease is favored by excessively dense sowing of seeds, too high humidity and too low temperature.
Gusting of cabbage seedlings is preventedby dressing seeds before sowing, sowing in good quality soil for sowing seeds, which was previously decontaminated, as well as ensuring the appropriate temperature and humidity of the substrate during emergence. "
We can use chamomile for ecological treatment of cabbage seeds . For this purpose, prepare an infusion of chamomile (10 g of dry chamomile flowers pour 1 liter of hot water and leave it, covered, to cool, then dilute with water in a ratio of 1: 5) and soak the cabbage seeds in it for 15 minutes.
In the fight against seedlings it is also helpfulwatering cabbage seedlingswith a solution of Magnicur Energy fungicide. For this purpose, 15 ml of this agent is dissolved in 10 liters of water and the seedlings are watered with this solution.
If we avoid the use of chemical fungicides, we can use the natural preparation Biosept Active for watering the seedlings, which stimulates plant growth and makes them resistant to diseases. In order to water the seedlings, dissolve 5-10 ml of the preparation in 10 liters of water and water the seedlings with this solution. The first watering can be carried out immediately after sowing the seeds.
Cabbage syphilis
Cabbage syphilis isa very dangerous disease of cruciferous vegetables , which is very difficult to get rid of from the garden. This is because the fungus Plasmodiophora brassicae, the causative agent of syphilis, can survive in the medium for up to 10 years.Therefore, traditional crop rotation and cultivation of cabbage in the same position, not more often than every 3-4 years, does not bring satisfactory results in the fight against syphilis.
Cabbage syphilis on cauliflower roots
Fig. Rasbak, CC BY-SA 3.0, Wikimedia Commons
Symptoms of cabbage syphilis are characteristic whitish growths on the rootsInitially, there are small white or yellow nodules, which gradually grow into irregular sprouts, bright yellow inside. The above-ground parts of cabbage develop slowly and often wither without tying the heads.
To effectively avoid this cabbage disease , it is worth knowing that the development of syphilis is favored by excessively acidic soil, high humidity and temperature 22-25 ° C. At soil temperature below 15 ° C, root infection is very slow or it does not occur.
Killing cabbage syphilisinvolves sowing seeds into a previously decontaminated substrate, liming the soil, if it is too acidic (in cabbage cultivation, soil pH from 6.5 to 7.5 is recommended), maintaining at least a 5-year break in the cultivation of cruciferous vegetables, if there was previously syphilis in a given place, as well as sowing seeds of resistant cabbage varieties or not very sensitive to syphilis.Before planting the seedlings in the field, the roots of the cabbage seedlings should be soaked in a solution of the natural fungicidal preparation Polyversum WP.
Alternariosis of cabbage - black cruciferous
Alternaria cabbage, also known as black cruciferous, manifests itself asoval, gray-brown spots on the forming heads of cabbageWithin the spots, light, concentrically arranged, dark zones appear and light stems with conidia of the fungus. A yellowish border is visible around the spots. Over time, the spots may blend together and the lower leaves may dry up and die. The tissues around the stains become necrotic and crumble, resulting inholes in the cabbage leavesThis symptom is often confused with the presence of pests gnawing holes on cabbage leaves.
Holes on cabbage caused by disease - black cruciferous
Fig. Seemadua, CC BY 3.0, Wikimedia Commons
Fighting this cabbage diseaseconsists in carefully collecting the leftovers from cabbage cultivation, because it is them that the fungus hibernates on until the next year, alternating and avoiding cabbage cultivation on the same plot for subsequent years 3-4 years and seed dressing before sowing.
For spraying cabbage against cruciferous black , fungicides are used, such as: Amistar 250 SC, Scorpion 325 SC, Signum 33 WG and Topsin M 500 SC.
Gray cabbage mold
Cabbage, like many other vegetables and garden plants, can be infested with Botrytis cinerea, which causes a disease called gray mold. On cabbage, gray mold appears asbrown, watery, leaves of various sizesThe development of this cabbage disease is favored by cool and humid weather. Under these conditions,the spots visible on the heads of the cabbagequickly become covered with a profuse gray-purple coating of the fungus spores.Head cabbage is especially sensitive to gray mold.
Ways to prevent gray mold on cabbageare similar to those of other diseases mentioned above. It is collecting crop residues so that the fungus does not overwinter on them, preserving crop rotation and growing cabbage on the same site no more often than every 3-4 years, as well as avoiding sprinkling the heads of cabbage during watering (e.g. drip irrigation can be installed, which supplies water
For spraying against gray mold on cabbage , you can use Amistar 250 SC, Scorpion 325 SC, Signum 33 WG and Topsin M 500 SC. These are exactly the same preparations that are used to combat the aforementioned alternaria. As a preventive measure, we can also help ourselves by spraying cabbage with the natural preparation Biosept Active.
Cottage cheese rot
Curd rot is another cabbage disease caused by fungi It is caused by the fungus Sclerotinia sclerotiorum, which can also infect many other plants. This disease can manifest itself when the heads of cabbage are formed, but also after harvesting, during the storage of vegetables.
Symptoms of curd rot areabundant, fluffy white mycelium coating on infected cabbage headsAround an orange border may appear on the white mycelium, as well as black sclerotia of the fungus.
The methods of preventing sclerosis rot andcabbage spray preparations against this diseaseare the same as for gray mold and rotaria (black cruciferous disease).
