6. Blossom-end rot
A lack of calcium leads to the development of this disorder, which creates dark brown or black spots on the bottoms of immature fruits. Keep plants evenly watered to ensure a steady flow of calcium to the plant, especially while fruit is forming.
Seedlings that suddenly fall over and rot are most likely affected by damping-off. Prevent this problem by keeping the soil in which seedlings grow slightly dry and by not over watering.
8. Bacterial spot
This bacterial disease causes purplish gray spots on upper sides of leaves and raised ones on the backs of leaves. Pull up and dispose of infected plants.
Mosaic is the most serious viral disease for peppers. Leaves become narrow and thickened, and they appear stringy. Pull and dispose of severely affected plants.
10. Southern blight
This fungal disease is most common in warmer climates. Mulch with compost after planting peppers, and rotate plants to avoid planting peppers in the same plot 2 years in a row.