What to Do About Leggy Tomato Plants? A Full Guide to Prevention and Control

When growing tomatoes, many diseases can affect yield and quality, and legginess is one of the more serious physiological disorders. Once tomatoes become leggy, their growth is thin and weak, and in severe cases it causes premature senescence. So what causes leggy tomatoes? And how should they be prevented and controlled? Let's take a look.

1. Causes of Legginess

There are quite a few causes of legginess in tomatoes. During the seedling stage, when soil moisture is high and relative humidity is mainly around 80%, and when a lot of nitrogen fertilizer is applied, seedlings are very prone to legginess under such conditions of abundant fertilizer and water. Alternatively, during continuous rainy weather, when humidity stays above 50%-60% for a long time, with insufficient light and overly dense planting, legginess can also occur. In autumn, extremely high temperatures, excessive nitrogen fertilizer, and too late transplanting can also cause legginess.

2. Preventive Measures

First, control the seedling age and transplant in time so as not to miss the best transplanting time. Generally, early-maturing varieties are transplanted at a seedling age of 60 days; mid-to-late-maturing varieties at 70-80 days. 15-30 days before transplanting, prepare the soil, apply fertilizer and manage light, and dig drainage ditches to facilitate irrigation and drainage, so that during the rainy season moisture can be reduced, which helps the seedlings recover after transplanting. Control the amount of nitrogen fertilizer applied, apply fertilizer reasonably, and promote balanced nutrition for the seedlings. When the seedlings grow to a certain height, set up supports and guide the vines in a timely manner, and prune branches and remove leaves, so that air circulation between plants is good. At the same time, growth regulators can be sprayed to prevent flower and fruit drop and increase the fruit-setting rate of the plants; when temperature or humidity is too high, ventilation must be done well to lower temperature and humidity.

3. Rescue Methods

When tomatoes have already become leggy, to minimize losses, rescue measures should be taken in time. First, in combination with intertillage and weeding, cut off some of the roots to reduce the roots' absorption capacity and control plant growth, but the main root of the plant should not be cut. Then spray chlorophyll to enhance the plant's photosynthesis. For plants growing excessively, the seedling-suppression method can be used: counting down from the top, pinch out water below the third node, so that the plant's nutrient transport is blocked, which can inhibit growth to a certain extent.

The above is an introduction to what to do about leggy tomato plants. We hope it helps you. To learn more related knowledge, please stay tuned to us.