Why does the bean get yellow leaves?
There can be various causes behind leaf discoloration, for example:
- Too much or too little moisture
- Disease infestation
- Pest infestation
- Too much or too little sun
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Too much or too little moisture
Like most crops, beans like it neither too dry nor too moist. They often react to drought with dry, brown-yellow leaves; too much moisture can lead to root rot or fungal infections, which also result in leaf discoloration.
Disease infestation
Yellow leaves are one of the symptoms of the dreaded bean mosaic virus. In the course of the disease, mosaic-like patterns appear on the infected leaves, which also bulge and warp. Diseased plants should be removed immediately.
Pest infestation
Even if a bean plant of Spider mites is affected, it reacts with yellow spots. This infestation is easy to recognize because the spider mites form web-like structures on the underside of the leaf. The animals can be easily removed with water and washing-up liquid after repeated use.
Too much or too little sun
Beans need sun, otherwise the harvest will be sparse and the bean will not grow properly. However, too much sun can also cause the bean to get sunburn. The result is brownish yellow spots on the leaves. Don't worry, too much sun will not damage your bean plant in the long term.
Eliminate causes
To find out the cause of the yellow leaves on your bean plants, you should use the exclusion principle: Examine your bean for pests, none there? Then look at the earth. Too wet, too dry? No? Then maybe the sun after all? If none of that fits, search the internet for pictures of diseased bean plants and compare them to your plant.
Make every mistake before removing the plants.