9_2_rec_veg_onions

Existing and validated forecasting models for pests and diseases should be used and the use of adequate monitoring devices by groups of growers recommended.

Thrips: Treatments should only be made after field inspections, monitoring with blue sticky traps indicates the infestation risk.

Downy mildew: The use of validated forecasting models should be taken into consideration.

Sclerotium spp. (white rot) and Fusarium spp: Plant material should be inspected for absence of infestation (see also crop rotation).