Why Are My Beetroot Leaves Turning Yellow?

Yellowing leaves on beetroot can be caused by several different conditions, and reading the pattern — which leaves are affected, how the yellowing appears, and what other symptoms are present — is the fastest way to identify the cause. Beetroot leaves contain both green chlorophyll and red or yellow betalain pigments, which means yellowing sometimes appears orange or salmon-coloured rather than pure yellow. The key distinctions are whether it is lower leaves, upper leaves, or the whole plant; uniform or patchy; and whether the roots are developing normally.

Lower leaf yellowing — normal senescence and nitrogen

The oldest, outermost leaves on a beetroot plant yellow and die naturally as the plant matures — this is normal and does not require action. If yellowing is more widespread, affecting middle-aged leaves as well, nitrogen deficiency is possible, particularly on light sandy soils. Apply a balanced liquid feed at half strength; high-nitrogen feeds can delay root development so balanced NPK is preferable to a pure nitrogen product. A single application usually greens up the foliage within a week.

Whole plant yellowing — waterlogging

When all leaves, including young central ones, turn uniformly pale or yellow together, the roots are failing. Waterlogged, anaerobic soil is the most common cause — beetroot roots cannot function without oxygen, and the whole plant deteriorates rapidly in saturated conditions. If the soil is wet and clay-heavy, improve drainage or grow in raised beds. In heavy rain years, gapping the tops of the root crowns above soil level (a natural tendency as the roots swell) actually helps by keeping the crown better aerated.

Mottled yellowing — beet mosaic virus

Irregular, mosaic-like yellowing — pale yellow and normal green in the same leaf — is caused by beet mosaic virus (BtMV) or beet yellows virus (BYV), both transmitted by aphids. Severely affected plants may also show leaf distortion. There is no cure; manage aphids to slow spread, and remove the most severely affected plants. The roots of mildly infected plants are usually still usable.