Daucus carota · Biennial
Carrot fly: Sow thinly to avoid thinning and use fine insect mesh barriers at least 60cm high.
Slugs and snails: Use physical barriers like copper tape or apply iron phosphate pellets around seedlings.
Aphids: Encourage natural predators like ladybirds or blast off with a strong jet of water.
Wireworm: Avoid planting in land recently used for potatoes; use brassica trap crops if possible.
Carrot leaf blight: Ensure good air circulation and avoid overhead watering to keep foliage dry.