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Yellow Leaves on Bean Plants – What Do They Mean?

Yellow Leaves on Bean Plants – What Do They Mean?

Bean plants are regarded as the harbingers of the hot season because they offer the first vegetable crops while also producing pods throughout the summer. 

They, like all plants, require careful care and upkeep in order to continue generating Beans for cultivation.

The majority of Beans are green, but there are also red, yellow, purple, and streaked variants. Green Beans can be circular or flat and can be a few inches long. 

It’s a must that all parts of the plant, from roots to leaves, are in good health. Nevertheless, there are occasions when you face the problem of yellow leaves in the Bean plant. 


Yellow Leaves on Bean Plants

Improper soil is the very first reason why the leaves turn yellow. Inadequate nutrient supply will also lead to yellow leaves. The roots that are damaged will also cause yellowing of the leaves. Lastly, viral infections in plants are also to be blamed for this.


Reasons for the Yellowing of the Leaves


Inadequate Sunlight

Every day, Bean plants require a specific percentage of sunlight. Pole Beans, for instance, require 8 hours minimum of sunlight per day.

If this is not completed, the leaves may begin to yellow because they will not be capable of producing quite enough chlorophyll. 

A lack of sun may also prevent rainwater from drying on leaves, resulting in fungal infections.


Improper Watering

The same can be stated for roo much or not enough water. Maintain a balanced amount of water to keep the soil moist. 

However, do not overflow it, as it may trigger root rot and yellowing of the leaves.


Poor Fertilization

Besides that, an absence of sufficient fertilization may have an impact on the wellbeing of your Bean plant, resulting in yellow leaves.

Make sure that your soil is evaluated so that you can determine what fertilizers are required depending on the soil test results.

A lack of nitrogen can end up causing plants and leaves to shift light green or yellow in color, along with inadequate harvesting. 

The same is true for manganese deficiency, which tends to cause older leaves to be yellow and brown spots to appear.


Poor Soil Quality

The first step is to inspect the planting area, as your soil could be the primary cause for yellowing on bean plants. 

Ensure the soil is in full sun and draining well and see if it has been planted with a good amount of fine compost.

If you have alkaline soil, this can lead to iron chlorosis. 

You can test for that with a soil test or by spraying vinegar into the soil. The soil is toxic if it produces bubbles on applying the vinegar.


Disease and Virus

If your Bean plants still have yellow leaves, the possible culprit is a disease. There are still other possible reasons. 

The most prevalent is the mosaic virus and blight.



When a pathogen is a primary reason for your leaves yellowing, you’ll see water sighting or dry brown leaf edges as the first signs. 

This would spread throughout the leaf, triggering the leaves to perish and then fall off. 

When this occurs, the plant is unable to collect solar power, which has a negative impact on its wellbeing. Moreover, as previously stated, the yellow leaves could be caused by blight. 

This condition causes circular yellow spots on the leaf, which gradually mix until the whole leaf becomes yellow. 

This bacterium resides in soil or is initiated through diseased seeds. Therefore, make sure to pick and plant immune Bean seeds and keep rotating the crop regularly.


Mosaic Virus

Yellow leaves can also be initiated by a viral infection. Bean mosaic viruses are the most common viruses that appear in various areas. 

The first signs are multicolored patches on the leaves of the plants, followed by yellow leaves and, finally, brown leaves.

If your bush or pole peans have yellow leaves, it could be due to a virus. There is, however, no remedy for this. 

Viral infections on plants can be caused by decreased nutritional concentrations and also herbicide injury, but they are most likely caused by infected Bean plant seeds. 

As a result, prevent storing seeds each year because they may contain the virus.  To lessen the possibility of yellow leaves on your plants, use seeds that are immune to mosaic virus.


Prevention and Treatment of Yellow Bean Plant Leaves

Your green plant Beans could be turning yellow for a variety of causes. 

Recognizing why this is occurring is critical so you can do something to either resolve the yellow leaves or stop them from occurring in future Beans.


Improving the Soil

  • Use well-draining soil, so it is best to use pots with drainage holes.
  • The soil should not be left dry for a very long time as this causes water deprivation for the plant.


Proper Sunlight

  • Place your Bean plant in a place where it receives partial to full sun.
  • Never place it in a dark location as it will let the water stay in the soil for a very long time. This floods the Bean plant and leads to problems including yellow leaves.


Adequate Watering

  • Water your Bean plant more frequently during the hot summer season.
  • Water the newly planted Beans once or twice a week since they are very delicate and do not demand a lot of water like a mature plant.


Proper Fertilization

  • Bean plants are light feeders and do not require a lot of fertilizing.
  • You can provide it the right amount of nutrients by simply mixing good quality fertilizer with the soil a day before planting the Bean.
  • A 5% nitrogen, 10% phosphorus, and 10% potassium are just the perfect ratio that Beans need to prosper. 
  • Always choose a fertilizer wisely and make sure that it has other micronutrients also.


Blight Prevention

  • Apply a preventive fungicide as soon as symptoms occur to help stop the disease from propagating.
  • After harvesting, erase and demolish all garden debris, and practice crop rotation.


Mosaic Virus

  • Purchase only disease-free seed from a trusted company and inspect the packaging to ensure this.
  • Rotate the Bean crop every year, particularly if you’ve had an infection previously.
  • It is important that you control aphids to avoid viral spread.


Frequently Asked Questions about Yellow Leaves on Bean Plants


Does overwatering lead to yellow leaves?

Overwatering is the leading cause of yellow leaves in the Bean plant. When the plant becomes submerged in water, it leads to root rot which further causes yellow leaves. Therefore, you must water it when it needs to be watered.


How can I avoid the spread of viruses and diseases that are causing yellow leaves?

To avoid disease and viruses, it is important that you rotate your plant every year. Avoid using old seeds as they might have an infection. If the infection is detected, destroy the plant as there is no cure for it.