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    Preventing Bell Pepper Blights

    ISU Extension and Outreach
    ISU Extension and Outreach reliable information about agriculture, 4H programs, food and nutrition, and family sciences. ISU Extension and Outreach has an office in Muscatine.

    Muscatine Living

    By Richard Jauron and Willy Klein–Iowa State University Extension and Outreach

    Bell peppers are the large, blocky, thick, sweet peppers belonging to the species Capsicum annuum. These three to four lobed fruits taper slightly at the bottom and, depending on the cultivar, are red, yellow, orange, or other colors at maturity. They are a great source of vitamin C.

    Use the tips above to grow healthy, beautiful bell peppers this summer.


    Horticulturists with Iowa State University Extension and Outreach explain problems that gardeners may encounter. To have additional questions answered, contact Hortline at [email protected] or (515)-294-3108.

    My bell peppers are flowering, but not setting fruit. Why?

    Bell pepper flowers may abort and fall off when night temperatures drop below sixty degrees Fahrenheit or daytime temperatures climb above eighty-five degrees. Maximum fruit set on bell peppers generally occurs at temperatures of seventy to eighty degrees (the temperature range for fruit set on bell peppers varies somewhat with the cultivar.) Hot peppers usually set fruit better in warmer weather than bell peppers. Fruit set can also be affected by soil moisture levels. Water plants in dry weather to ensure an adequate moisture supply and encourage fruit set.

    Why are brown spots developing on the bottoms of several of my bell peppers?

    The brown spots on the peppers are likely due to blossom end rot. Blossom end rot is caused by a calcium deficiency in the developing fruit. Fluctuating soil moisture levels due to drought or inconsistent watering practices, high nitrogen fertilization, and root pruning during cultivation are factors that contribute to blossom end rot. To reduce the incidence of blossom end rot, water plants once a week during dry weather to maintain uniform soil moisture levels, control weeds with shallow cultivation or mulching, and apply only small amounts of nitrogen to the garden. There is no need to apply calcium to the soil, as most garden soils contain adequate levels of calcium. Blossom end rot may also occur on tomatoes, eggplant, watermelon, cucumber, and summer squash.

    Light colored areas have developed on the sides of several fruit on my pepper plants. Why?

    The heat of the sun has likely burnt the side of the fruit exposed to the sun. This type of damage is referred to as sunscald. Initially, a soft, light-colored area develops on the fruit. Eventually the area dries, becoming white and paper-like in appearance. Sunscald typically occurs in hot, sunny weather. The occurrence of sunscald can be reduced by controlling leaf diseases that defoliate plants, lightly fertilizing plants to promote leafy growth, and growing plants in staggered, double rows.

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