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- Title
Evaluation of a guardian plant system to suppress Frankliniella occidentalis (Thysanoptera: Thripidae) in greenhouse ornamentals.
- Authors
Sullivan, Cheryl Frank; Davari, Agrin; Kim, Jae Su; Parker, Bruce L.; Skinner, Margaret
- Abstract
BACKGROUND: Western flower thrips (WFT), Franklinella occidentalis (Pergande), is an economically damaging pest of greenhouse ornamentals. A 'guardian plant system' (GPS) that targeted WFT was evaluated under controlled and commercial greenhouse conditions. This system used mycotized millet grains with the entomopathogenic fungus Beauveria bassiana (Balsamo‐Crivelli) Vuillemin applied to soil of potted marigolds, Tagetes patula (L.), combined with the foliar‐dwelling predatory mite Neoseiulus (=Amblyseius) cucumeris (Oudemans) in slow‐release sachets under controlled greenhouse conditions, and with the addition of a pheromone lure under commercial settings. RESULTS: Significantly fewer WFT and less foliar damage on GPS was observed over the 10 and 12 weeks experimental periods compared to the untreated controls. Predatory mites were maintained up to 10 weeks with one release under controlled greenhouse conditions and 12 weeks with two releases in commercial greenhouses. In commercial greenhouses, greater numbers of WFT were found on marigolds than on crop plants within 1 m of the system. Fungal granules persisted for 12 weeks up to 2.5 × 105 CFU g−1 in the GPS soil. CONCLUSION: The use of biological control agents to suppress WFT within a GPS could be a useful IPM strategy for greenhouse production. The marigold GPS attracted WFT which were suppressed primarily through predation by foliar‐dwelling predatory mites and to a lesser extent, infection from conidia produced by the granular fungal formulation in the soil. Further investigations into system deployment and fungal granular application rates and new fungal formulations are suggested to improve system efficacy. © 2023 Society of Chemical Industry.
- Subjects
SOCIETY of Chemical Industry (Great Britain); FRANKLINIELLA occidentalis; THRIPS; PREDATORY mite; BIOLOGICAL pest control agents; GREENHOUSES
- Publication
Pest Management Science, 2023, Vol 79, Issue 10, p3559
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.7556