Tropaeolum majus · Annual
Aphids (Blackfly): Squash by hand, blast off with water, or use a plant-based insecticide if severe.
Whitefly: Use yellow sticky traps and spray with horticultural oil or insecticidal soap.
Red spider mite: Keep plants well-watered and spray with a miticide or horticultural oil.
Viral infection: Remove and destroy infected plants immediately to prevent spread via aphids.
Slugs and snails: Use beer traps, copper tape barriers, or iron phosphate-based pellets.