A Detailed Explanation of the Causes of Dry Leaves in Yardlong Beans and the Control Methods
Yardlong beans are a common sight in our markets, and many problems arise during the growing process, with dry leaves being one of the most troublesome. When the leaves of yardlong beans suddenly dry up during cultivation, this seriously affects the growth of the yardlong beans and also has a certain impact on yield and quality. So what causes this in yardlong beans? How should it be controlled? Let's take a look together.
I. Causes of Dry Leaves
Dry leaves in yardlong beans are mostly induced by herbicides. It initially shows as the old leaves of the yardlong bean drying up while the stems and vines remain green. As the yardlong bean grows, the new leaves become deformed, with the leaf blades wrinkled and uneven. If the yardlong bean is in the pod-setting stage, flower drop will occur, the plant grows poorly, and yield is seriously affected. In addition, some diseases and pests can also cause dry leaves in yardlong beans. The common leaf roller (rice leaf roller) damage can also cause dry leaves and curled leaves.
II. Control Methods
1. Washing with clean water
The spraying period for herbicides is generally 7-10 days. During this period, water should frequently be sprayed on the stems and leaves of the yardlong beans to reduce the residual dose of herbicide on the yardlong beans and alleviate the dry leaf phenomenon.
2. Timely topdressing
When the dry leaf phenomenon occurs, fertilizers mainly consisting of ammonium bicarbonate or urea can be applied promptly, and an appropriate amount of phosphorus and potassium fertilizer can also be properly combined to help the plant recover. The amount of topdressing should be based on the severity of the phytotoxicity and the growth condition of the yardlong beans.
3. Timely watering
Watering promptly after topdressing can promote the fertilizer effect to be released as quickly as possible and reduce the concentration of harmful substances in the yardlong bean plant, alleviating the symptoms. Foliar spraying of plant growth regulators and foliar fertilizers can also be done, and mixed spraying with 7500-fold brassin solution plus foliar fertilizer gives better results. According to the degree of phytotoxicity, spray once every 10-15 days, for 1-3 consecutive times.
4. Disease and pest control
In the early stage of pest occurrence, check and pick off the curled leaves on the bean plants, take them out of the field for centralized treatment, or pinch and kill the larvae inside the curled leaves by hand, or spray insecticides such as pyrethrin emulsifiable concentrate, cypermethrin emulsifiable concentrate, and fenvalerate for control. Note to alternate the spraying of insecticides to avoid pests developing resistance.
The above is an introduction to the causes of dry leaves in yardlong beans and the control methods. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.