The Battle Against Broad Mites in Spring Crops
March 14, 2024 
Broad mite damage on torenia. Photo: Sarah Jandricic, OMAFRA
Broad mites (Polyphagotarsonemus latus) can be a regular occurrence in spring crops, especially Reiger begonias and New Guinea impatiens. Other crops that are commonly affected include torenia, exacum, ipomea, and gerbera.
Broad mite are often difficult to detect and control. A recent post on OnFloriculture.com offers tips on monitoring and the latest management strategies for this pest.
Broad mite’s small size means that spotting the mite is nearly impossible using just a hand lens. Damage is usually the first sign a grower sees, so susceptible crops should be walked and inspected regularly. Damage can occur at very low mite densities, and often doesn’t occur for a good 20 to 30 days after the crop has already been infested.
Broad mites feed on new growth, so that’s where you want to look. The mite’s toxic saliva results in copper or purplish-colored damage on growing points. Leaves often turn downwards.
Unfortunately, new growth also means buds, which can become discolored and malformed. Flowers often are prevented from fully developing. Petioles and internodes can also become shortened, so look for stunted plant growth, as well.
For more information, including how to differentiate broad mite damage from other plant health problems, as well as treatment, check out the original OnFloriculture.com post.
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