Onion Oil in Diffusers to Control Carrot Flies
Filled diffusers that give off a strong onion odor noticeable at close range. The oil evaporates slowly over the course of the season: check the level regularly. Results are not guaranteed: they depend on the preparation, the time of use, and local conditions.
When to use: Routinely
Opportunist: Carrot fly (Insect)
Warning: the associations between recipes and opportunists come from other references (traditional practices, publications, user feedback). They are neither a recommendation nor a claim of effectiveness. There is no certainty regarding the preparation, application and use of these bio-preparations. See the regulations
Application description: Use approved by Implementing Regulation (EU) 2018/1295 and its review report SANTE/10615/2018: outdoor umbelliferous crops (carrot, parsnip, celeriac, root parsley; the ITAB also mentions celery and fennel), against the carrot fly (Psila rosae), by masking the odor of the crop. From shortly after sowing, planting, or emergence (starting in mid-April) until the end of November, before harvest.
Dose: Container-type dispensers: 0.08–0.16 L/ha (4–8 dispensers of 20 mL). Granule dispensers: 17.6–35.2 g/ha (4–8 dispensers containing 4.4 g of oil). Only one application per season.
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