White Spots on Begonias

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Begonias are colorful and versatile plants that work well outdoors in a garden or container, or as an indoor plant, according to Cornell University. Begonias grown in less-than-ideal conditions may develop diseases that sometimes cause white spots on leaves, flowers or even the soil.

Fungi

  • There are two fungal diseases that afflict begonias and can cause the appearance of white spots on areas on the plant: myrothecium leaf spot and southern blight. Black spots with a white ring around them indicate myrothecium. Southern blight results in white mycelia growing in a fanlike pattern on leaves or over the soil around the begonias.

Powdery Mildew

  • Powdery mildew begins with separate, circular white spots on the leaves that later develop, expand and merge together. Powdery mildew stunts growth, results in abnormal growth of the leaves and other plant parts and causes death in begonia plant tissues, according to Cornell University. Apply fungicides to correct this problem.

Oedema

  • If begonia roots take water in faster than the plant can use it, pressure builds up inside the flower. Blisters form and may be white, brown or tan, according to Cornell University. High moisture levels, along with warm soil and cool air temperatures, increase the likelihood of this condition. Limit watering and leave ample space between plants to avoid the development of oedema in your begonias.


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