Symptom
Drooping or wilting
Wilting means water is not reaching the leaves. The plant may simply be dry, but drowned roots, damaged roots, heat and wilt diseases produce the same droop. The soil tells you which.
Push a finger into the soil first. Dry means water; wet means roots. Then watch whether the plant recovers overnight.
Likely causes
Ordered from the usual answer to the less likely one. Each links to the full problem.
Recorded on Chili peppers
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Light & temperature Common
Heat stress
Wilts in afternoon heat, recovers by morning. -
Fungal disease Possible
Root rot
Wet soil, brown mushy roots, no recovery. -
Damage Possible
Transplant shock
Starts right after planting or repotting. -
Fungal disease Possible
Fusarium wilt
Wilting with one-sided yellowing; brown streaks in the stem.
Less likely on Chili peppers
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Watering Common
Underwatering
Dry soil; plant recovers within hours of watering. -
Watering Common
Overwatering
Wet soil; leaves soft and yellow. -
Damage Possible
Root damage
After digging, wind rock or pests at the roots. -
Fungal disease Possible
Verticillium wilt
Afternoon wilting of older leaves, brown staining inside. -
Bacterial disease Possible
Bacterial wilt
Sudden wilt of whole cucurbit runners that never recovers. -
Pest Less likely
Vine weevil
Pot plants collapse; white grubs at the roots. -
Pest Less likely
Cabbage root fly
Young brassicas wilt; maggots on the roots. -
Fungal disease Less likely
Clubroot
Brassicas wilt on warm days; roots swollen.