Why is my Cucumber dying?
A dying cucumber is usually reacting to water and weather stress, but pests, diseases, viruses, and spray damage can look very similar at first.
If you can already see the symptom
Answer what you can see
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The causes in full
Drought or uneven wateringMOST COMMON
How to tell
The soil is dry two inches down, the plant wilts all over, and leaves may recover in the evening before wilting again the next hot day.
What to do
If the soil is dry two inches down, water slowly and deeply at the base until the root zone is moist, then mulch to keep it from drying out so fast. If the soil is baked hard and cracked, soak in stages so water sinks in instead of running off.
Waterlogged soil or root rot after rainCOMMON
How to tell
The soil stays wet or sour-smelling, lower leaves yellow first, and the plant wilts even though the bed is not dry.
What to do
If the soil is waterlogged two inches down, stop watering until it is only damp, and open shallow channels so standing water can drain away from the stems. Remove badly collapsed plants with soft, rotten roots or stems.
Heat scorch or afternoon sun burnCOMMON
How to tell
The worst damage is on the leaves facing the hottest afternoon sun, with pale tan or crisp patches rather than spots spreading leaf to leaf.
What to do
If the soil is dry two inches down, water deeply in the morning; if it is damp, do not add extra water just because the leaves look scorched. During extreme heat, use temporary afternoon shade cloth or a light cover, then remove it when the heat breaks.
Cucumber beetles, downy mildew, bacterial wilt, or virusCOMMON
How to tell
Look for striped or spotted beetles, sticky wilting runners, yellow angular leaf patches, fuzzy growth on leaf undersides, or mottled twisted new leaves.
What to do
If the soil is damp two inches down and the plant still wilts or declines, do not keep watering to solve it; remove severely wilted or virus-distorted plants and clean up infected leaves. Hand-pick beetles, use row cover before flowering on future plantings, and remove badly diseased foliage to slow spread.
Cold snap or late frost injuryLESS COMMON
How to tell
The newest tips or exposed leaves look limp, dark, glassy, or bleached soon after a cold night.
What to do
Leave damaged leaves in place until the weather warms, then trim only the dead parts. Water only if the soil is dry two inches down after the cold passes, and cover plants on any more cold nights.
Herbicide drift or fertilizer burnLESS COMMON
How to tell
New leaves are twisted, cupped, or strap-like after nearby spraying, or leaf edges burn soon after fertilizer landed on leaves or dry soil.
What to do
Stop spraying or fertilizing until the plant shows normal new growth. If fertilizer granules are present and the soil is not waterlogged, water deeply once to dilute them; for herbicide drift, remove only dead tissue and wait to see whether new growth returns normal.
Will it recover?
Brown, yellow, spotted, or bleached cucumber leaves will not turn green again; wilted leaves may perk up if they were not burned, but the real sign of recovery is healthy new growth.
Stopping it happening again
Keep cucumbers in full sun with evenly moist but not soggy soil, mulch the bed, give temporary afternoon shade only during extreme heat, plant after cold nights are past, and check often for beetles, aphids, spots, and mildew.
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