9_3_strict_veg_lettuce

Wherever a control measure is deemed necessary, a biological or biotechnical control method must be used if available and effective.

Pests

Seed treatments may be used where available.

Aphids: Selective insecticides, where available, must be applied and application only be based on presence/absence monitoring of wingless forms or available thresholds.

Lepidoptera: Application of selective products (e.g. Bt, IGR) where available and effective, instead of broad-spectrum products, is mandatory.

Thrips: Only treatments of summer and autumn cycles are permitted if viruses are cause problems in the area or if there is visible damage.

Slugs: Localised treatments with baits in the border area only

Diseases

Downy mildew: Anti-resistance strategy mandatory for fungicides. 

Weeds

Mechanical weeding must be preferred.