By Tom Dudek, Michigan State University Extension
Broad mites are less than 0.3 millimeters – smaller than a period in font size 12 print – and infest several greenhouse crops, including African violet, ageratum, azalea, begonia, dahlia, gerbera, ivy, bedding impatiens, lantana, marigold, New Guinea impatiens, peperomia, snapdragon, torenia, verbena and zinnia. According to Michigan State University Extension, broad mites will damage flowers and foliage of begonia and cyclamen and bronze the lower leaf surfaces. Their toxic saliva causes twisted, hardened and distorted growth in the terminal of the plants (see photos below). This feeding injury will last for a long time even after the infested plant has been treated and the mites have died.
Latest from Greenhouse Management
- Anthura acquires Bromelia assets from Corn. Bak in Netherlands
- Top 10 stories for National Poinsettia Day
- Langendoen Mechanical hosts open house to showcase new greenhouse build
- Conor Foy joins EHR's national sales team
- Pantone announces its 2026 Color of the Year
- Syngenta granted federal registration for Trefinti nematicide/fungicide in ornamental market
- A legacy of influence
- HILA 2025 video highlights: John Gaydos of Proven Winners