Existing and validated forecasting models for pests and diseases should be used and the use of adequate monitoring devices by groups of growers is recommended.
Aphids: In spite of using resistant varieties to Nasonovia ribisnigri check presence of other aphids. Take into account presence of natural enemies. Be aware that there are biotypes of Nasonovia that can overcome the current type of host-plant resistance.
Leaf-miners: Take into account presence of natural enemies.