Causes of the disease
When growing seedlings in the ground or on soil mixtures that include earth, plants often suffer from blackleg diseases in the first stages of their development. It is a fungal disease caused by soil pathogens. Weakened plants are affected.
The stems of plants affected by it become thinner and darker at the root collar. The roots die off, seedlings are easily pulled out of the ground. Not only seedlings are affected by this disease, but also plants sown directly in open ground with seeds. Tomatoes, cabbage, radishes, lettuce, cucumbers, and beets are most affected by it. The appearance of the disease is facilitated by high humidity, excessive watering, thickening of crops, and sudden changes in temperature. There are several ways to deal with the black leg.
How to deal with black leg?
To fight this disease, first of all, sow seeds for seedlings only in treated soil: steamed or roasted, spilled with a solution of potassium permanganate (0.1 g per liter of water) or a solution of copper sulfate (0.1 g per liter of water). It is possible to use the biological product Trichodermin for tillage (according to the instructions). If, nevertheless, the black leg develops, it is necessary to reduce watering, sprinkle the plants and soil with a solution of copper or iron sulfate (0.1 g per liter of water), then add to the leaves of clean, disinfected soil with ash (1 teaspoon of ash per liter jar soil). And help the plants grow faster, get stronger: add lighting, feed the seedlings with mineral fertilizers or slurry.