The San Francisco Chronicle explains that the leaves fall off of a green pepper plant because of temper fluctuations or fungal infections. There are other diseases that also affect the leaves, such as bacterial infections and infestations.
One reason that green pepper plants lose their leaves is because of temperature fluctuations. Normally these plants need plenty of heat and sun to grow, so if temperatures, fall then the plants respond by losing leaves. Gardeners need to make sure these plants have full sun when planting them..
Another reason green pepper plants lose leaves is because of a fungal infection. Signs of this disease include yellow and shriveled leaves. Because fungal infections are contagious, it is important for gardeners to make sure there is plenty space between plants to prevent the spread.
There are other reasons that cause problems with green pepper plant leaves, like bacterial infections and infestations. A bacterial infection causes the leaves to spot. This is contagious, so it is best to get rid of the plant as soon as possible. Another problem is an infestation by aphids. These tiny insects attack the leaves, and as a result, the plant is more likely to succumb to bacteria or mold.