What factors can cause a large number of aerial roots to grow on the stem?
The first is bacterial pith necrosis. Judging from the diseases that can induce a large number of aerial roots in tomatoes in recent years, bacterial pith necrosis is the first. This disease is very concealed during the early infestation. It invades from the wounds caused by leaf thinning and fruit picking, and then causes the pith rot in the stem. With the development of the disease, it affects the xylem and phloem, thus affecting the moisture and organic Transportation of nutrients. The key point of the judgment is that the middle and upper leaves are wilting, the stalk has a large number of aerial roots or protrusions, and the pith is brown and rotted after the stalk is cut.
The second is root disease. Mainly stem base rot and root rot, when these two diseases cause nutrient transport to be blocked, aerial roots will also appear on the stem. However, because these two diseases mainly inhibit water transport, the plants generally wilt and die before aerial roots are induced. When the humidity is high, the early infection of these two diseases may induce the appearance of aerial roots.
Then there is the damage of naphthalene acetic acid. Naphthalene acetic acid can promote rooting, preserve flowers and fruits. In the production process, many vegetable farmers spray NAA to achieve the effect of flower preservation and fruit preservation when the flowers and fruits are falling. On tomatoes, excessive use of naphthalene acetic acid will induce a large number of aerial roots, accompanied by twisted stems. Some fertilizers add appropriate amount of naphthalene acetic acid, which will have a good rooting effect, but the above situation will also occur when the fertilizer is used excessively.
Of course, if there is a suitable temperature and continuous high humidity in the shed, a large number of aerial roots will appear on the tomato stalks. When the temperature is not suitable or the humidity is reduced, the aerial roots will no longer grow or dry off.
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