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The cabbage hernia is a fungal disease that affects not only different types of cabbage, but also other cruciferous vegetables such as mustard or radish. The causative agent is a slime fungus called Plasmodiophora brassicae. The fungus lives in the soil and forms spores that can last up to 20 years. It penetrates into the plant via the roots and causes an uncontrolled division of the root cells by mobilizing various growth hormones. In this way, bulbous thickenings develop at the roots, which damage the pathways and thus disturb the water transport. Especially in warm, dry weather, the leaves can not be sufficiently supplied with water and begin to wither. Depending on the weather and infestation strength, the entire plant will gradually die off.
Prevent cabbage hernia
The white cabbage 'Kilaton F1' is considered resistant to cabbage hernia
In the home garden you can prevent the Kohlhernie by regular crop rotation. Cultivate cabbage crops on a bed for at least five to seven years before planting cabbage and do not sow any cruciferous vegetables (such as mustard or rapeseed) as green manure. Slime mold thrives particularly well on compacted, acidic soils. So loosen impermeable soils with compost and deep digging. Depending on the type of soil, you should keep the pH in a range between six (sandy soils) and seven (loamy soils) with regular lime deposits.
When cabbage is attacked by cabbage hernia, clear growths appear at the root
By cultivating resistant cabbages, you can also largely prevent a coal hernia infestation. Cauliflower varieties include the 'Clapton F1' cauliflower, 'Kilaton F1' and 'Kikaxy F1' cabbage varieties, 'Autumn Fun F1' and 'Orient Surprise F1' cabbage varieties, and all kale varieties. Especially susceptible are Brussels sprouts and kohlrabi. Fighting the cabbage hernia directly with fungicides is not possible, but experiments have shown that lime nitrogen fertilization can significantly reduce the number of fungal spores.
By the way: If possible, do not grow strawberries on former cabbage beds. Although they show no disease symptoms, but can still be affected by the Kohlhernie and contribute to the spread of the pathogens. Also, weeds from the family of cruciferous vegetables, such as the shepherd's purse, should be removed from your vegetable beds due to the risk of infection.