Flea Bettle Close Up
The Flea Beetle
Attacks by flea beetle cause lots of tiny holes in the leaves.
The damage is only superficial, so usually not worth worrying about. If it is a particular problem in your garden you can cover the seedlings with horticultural fleece.
Slugs and Snails
Slugs and snails:
Feed on the young seedlings. You’ll see the tell-tale slime trail of slugs and snails on the soil around your crop, as well as on the leaves.
There are many ways to control slugs and snails, including beer traps, sawdust or eggshell barriers and copper tape. Slug pellets of powders based on aluminium sulphate or ferric phosphate are less toxic for wildlife.
Brassica Downy Mildew
Brassica Downy Mildew:
This is a common disease of brassicas, but less so on radishes, as they are not in the ground so long. The leaves will turn yellow, with white, fuzzy patches on the undersides. The radish root may also turn brown.
Remove infected plants as soon as you see them. Don’t plant radishes in the same place as previous brassica crops. There is no chemical control.