This is the time of year that two “nefarious” insect pests may hamper your ability to produce a quality crop. These are the western flower thrips (Frankliniella occidentalis) and fungus gnats (Bradysia spp.). 1. Why are western flower thrips and fungus gnats major insect pests in greenhouse production systems? 2. What are the visual symptoms of western flower thrips and fungus gnat larvae feeding damage on plants? 3. What is the best way to scout/monitor for both insect pests? 4. What are the preferred pest control materials for western flower thrips and fungus gnats? For fungus gnat larvae, control materials that may be effective as a drench are Bacillus thuringiensis spp. israelensis (Gnatrol), chlor-fenapyr (Pylon), cyromazine (Citation), dinotefuran (Safari), and pyriproxyfen (Distance). 5. Which biological control agents may be used? For fungus gnats, there are three commercially available natural enemies that are quite effective in suppressing larval populations including the soil-borne predatory mite Hypoaspis miles (=Stratiolaelaps scimitus), the rove beetle (Atheta coriaria) and the beneficial nematode species Steinernema feltiae.
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Raymond Cloyd |
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