Potato plant leaves curling?

On potatoes, curling leaves usually mean the plant is under stress from heat, water, pests, cold, virus, or nearby spray drift.

Answer what you can see

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Push a finger two inches into the soil. What does it feel like?

Which leaves are affected?

What has the weather been doing?

How fast did this happen?

Some answer sets overlap: dry soil with fast curling can fit either heat stress or herbicide drift, and slow curling in normal weather can fit either pest feeding or potato leafroll virus, so use the confirm checks to separate them.

The causes in full

Heat and dry soil stressMOST COMMON

How to tell
Check whether the soil is dry two inches down and whether leaves curl most in hot afternoon sun, then relax somewhat by evening or the next morning.

What to do
If the soil is dry two inches down, water deeply so the root zone is moist, then mulch to slow drying. During extreme heat, temporary afternoon shade cloth can help, but keep potatoes in full sun otherwise.

Waterlogged soil and stressed rootsCOMMON

How to tell
Push into the bed and look for soggy soil, puddling, yellowing lower leaves, or plants that wilt even though the soil is wet.

What to do
If the soil is waterlogged, stop irrigation until the top few inches are no longer soggy and open shallow channels so storm water can drain away from the row. Do not add more water just because the leaves are curled when the soil is already wet.

Aphids or leafhoppers feeding on leavesCOMMON

How to tell
Look under curled leaves and on tender tips for clusters of small aphids, sticky residue, shed white skins, or tiny wedge-shaped leafhoppers that jump when disturbed.

What to do
If you find aphids or leafhoppers, knock them off with a strong hose spray or use labeled insecticidal soap on the undersides of leaves, repeating as the label says. Remove heavily infested, badly curled shoots if they are not recovering.

Herbicide drift or spray damageLESS COMMON

How to tell
Suspect this if the newest leaves are twisted, narrow, cupped, or fern-like, especially on the side facing a lawn, path, fence line, or recently sprayed area.

What to do
If spray drift is likely, stop any nearby weed-killer exposure and do not fertilize hard to force recovery. Keep normal care going, and water only if the soil is dry two inches down.

Late frost or cold shockLESS COMMON

How to tell
Check for curled, limp, darkened, or translucent tender growth after a cold night, especially on the most exposed tops and edges of the row.

What to do
If a cold snap or late frost caused it, leave the plant alone until you can see which leaves are still alive, then trim only dead tissue. Cover plants with frost cloth before the next forecast frost.

Potato leafroll virusRARE

How to tell
Look for stiff upward-rolled leaves, stunted plants, yellowing or purpling, and curling that keeps spreading even after soil moisture and weather stress are corrected.

What to do
There is no cure for potato leafroll virus; remove badly stunted infected plants to reduce spread by aphids. Control aphids and plant certified disease-free seed potatoes next season.

Will it recover?

Leaves curled from heat or thirst may flatten again, but leaves damaged by frost, spray, pests, or virus often stay curled, so judge recovery by healthy new growth.

Stopping it happening again

Keep potato beds evenly moist but not soggy, mulch after the soil warms, improve drainage, scout leaf undersides weekly, protect from late frost, and avoid weed-killer drift near the patch.