Beware of broad mites in cannabis

Added on 09 October 2020

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Broad mites are a constant concern for cannabis growers. They prefer young plants and are typically found feeding on the newest growth. Active year-round in glasshouse crops, this tiny pest can cause plants to become deformed and stunted. Failure to control broad mites in time often leads to unmarketable plants, fruit discoloration, and even fruit drop.

Severe mite infestations can result in plant death. Overall plant health and quality is significantly diminished due to the toxins found in broad mite salvia. Symptoms of attack generally remain visible several weeks after the mites have been controlled.

Broad mite eggs are laid on the underside of leaves or in depressions on fruit. Hatching within two to three days, the mobile larvae begin feeding. Within two to three more days, they develop into quiescent (sedentary, non-feeding) nymphs. Once the quiescent stage is complete, the females are carried off by mature males to new leaves where they mate, and the life cycle starts again.

Click here for tips from Biobest Group on how to ID and manage broad mites.