What to Do About Excessive Leggy Growth in Yardlong Beans? Causes and Control Methods Explained

Yardlong beans are one of the common vegetables on our dining tables. During the cultivation of yardlong beans, many vegetable growers know that they are difficult to manage and often present many problems. Excessive leggy growth in yardlong beans is an extremely common phenomenon; leggy yardlong bean plants struggle to set pods, and may even drop flowers and pods. So what causes leggy growth in yardlong beans? How should it be controlled? Let's take a look.

1. Temperature too high

The main cause of leggy growth at the seedling stage is excessively high temperature, especially excessively high nighttime temperature, which causes the plant to consume too much through respiration and very easily leads to leggy growth.

Control methods: At the seedling stage, temperature should be controlled reasonably. The suitable growing temperature for yardlong beans is between 25-35 degrees, with growth being fastest at 30 degrees, so the nighttime temperature should be kept from exceeding 25 degrees to avoid leggy growth.

2. Sowing too densely

The period when the cotyledons of yardlong bean seedlings open is the fastest-growing period and also the period most prone to leggy growth. At this time, the main cause of leggy growth is sowing too densely, or failing to remove the covering in time, which makes the seedlings grow too crowded and leads to leggy growth.

Control methods: After emergence, thin the seedlings and transplant in time, improve light penetration and ventilation in the field, and control temperature and humidity well. Low temperatures can control leggy growth in seedlings. Once seedlings show leggy growth, a chlormequat chloride solution can also be sprayed to control it.

3. Improper fertilization

Besides temperature and humidity, the main cause of leggy growth in yardlong bean plants is improper fertilization, mainly manifested as excessive application of nitrogen fertilizer or nutrient excess. To speed up plant growth, some farmers apply large amounts of nitrogen fertilizer when planting, and when the proportion of nitrogen in the soil is too large, it causes nutrient excess in the plant, which leads to leggy growth.

Control methods: When planting, apply less quick-acting nitrogen fertilizer, and instead apply farmyard manure or organic fertilizer rich in organic matter, which can continuously and steadily provide the nutrients the plant needs for growth. On the other hand, when combining with pest and disease control, spray the plants with hormone drugs such as mepiquat chloride and chlormequat chloride, which have an excellent effect on inhibiting leggy growth.

The above are the causes and control methods for leggy growth in yardlong beans. We hope this helps you. To learn more about growing knowledge, please stay tuned to us.