Powdery mildew on succulents is not what you would expect

Powdery mildew on succulents can appear more like sun scald or edema. In this alert, e-Gro Alert will show you what to look for and the fungicides labeled to treat powdery mildew. 

From 1998 to 2019, cacti and succulent production for containers, crafts, and floral arrangements has increased by over 75% ($78.6 million USD) and is expected to continue to increase due to continued consumer interest in house plants. In terms of production challenges, the biggest complaint from greenhouse growers is their slow growth and limited production and pest management information. Generally, succulents have few pest or physiological issues. The most common include: mealy bugs, scale, powdery mildew, edema, and sun scald.

Signs of powdery mildew infection are fairly easy to recognize when the pathogen is advanced or severe on most crops (Fig. 1). This includes, white grey, talcum-like colonies of fungal growth on the upper leaves of most susceptible plants.

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