Planning reference

Fusarium Wilt vs Verticillium Wilt

Separate Fusarium wilt from Verticillium wilt before replacing tomatoes, changing soil, composting plants, grafting, solarizing, or assuming every wilted nightshade has the same problem.

What each tomato wilt signal means

Fusarium wilt

Fusarium wilt is a soilborne vascular disease that plugs water movement in susceptible tomatoes, peppers, eggplants, and related nightshades, often showing up when soils are warm and plants are carrying fruit.

Verticillium wilt

Verticillium wilt is another soilborne vascular disease with overlapping tomato symptoms, but it often develops more slowly, can appear in cooler conditions, and can be hard to separate without cultivar history or lab diagnosis.

Warm-soil, one-sided yellowing and dark vascular browning

Lower leaves that yellow on one side of a plant or one side of a leaflet, wilt during the day, recover at night, and show brown vascular streaking when the lower stem is cut point toward Fusarium wilt.

Cooler-soil, slower, more uniform interveinal yellowing

Lower leaves with pale interveinal yellowing, V-shaped or wedge-like lesions, gradual wilt, and lighter vascular browning in cooler or moderate weather point toward Verticillium wilt.

Stem scrape, crop history, and diagnostic-lab limits

Both wilts can brown the vascular tissue and persist in soil. Use resistant-variety letters, previous tomato or potato crops, root-knot nematode pressure, and lab confirmation before making long-term soil decisions.

Soilborne wilt workflow

Do not diagnose from wilt alone

Do not treat every wilting tomato, pepper, eggplant, or potato as the same problem; check lower-leaf timing, one-sided yellowing, night recovery, fruit-sizing stage, stem vascular browning, soil temperature, cultivar resistance letters, root-knot nematode pressure, drainage, crop rotation history, and whether a diagnostic lab is needed before replanting, composting, grafting, solarizing, or applying any product.

Check the crop and cultivar letters

Use tomato, pepper, eggplant, potato, or nightshade history and resistance letters such as F, FF, FFF, or V before assuming one soilborne wilt.

Cut low on the stem

Scrape or cut a lower stem to look for brown vascular tissue, then compare the pattern with leaf symptoms instead of relying on one wilted afternoon.

Separate soilborne wilt from leaf diseases and transplant stress

Early blight, Septoria, late blight, bacterial spot, drought, waterlogging, transplant shock, and root injury can all mimic or compound wilt symptoms.

Plan prevention, not rescue

Once vascular wilt is established, product cures are limited. Use resistant varieties, clean transplants, crop rotation, weed and volunteer control, soil-health practices, drainage, and sanitation for the next planting.

Use these paths

• Transplant Shock vs Normal Wilting Separate sudden transplant stress, heat, wind, cold nights, and recovery timing from soilborne vascular wilt before replacing plants
• Early Blight vs Septoria Leaf Spot Keep lower-leaf spotting and defoliation diseases separate from whole-plant vascular wilt before pruning or spraying
• Late Blight vs Early Blight Separate urgent water-soaked late blight from slower lower-leaf disease before composting debris or removing plants
• Bacterial Spot vs Septoria Leaf Spot Check leaf-spot and fruit-spot patterns before confusing bacterial or fungal leaf disease with vascular wilt
• Crop Rotation vs Companion Planting Use crop-family rotation and resistant varieties for soilborne wilt prevention instead of relying on companion planting
• Raised Bed vs In-Ground Garden Compare drainage, soil warming, compaction, and imported-soil choices before replanting nightshades into wilt-prone beds
• Garden Soil Prep Planner Check soil texture, drainage, organic matter, and bed history before changing wilt-prone tomato beds

Source basis

• UC IPM Fusarium wilt in tomato Tomato Fusarium wilt symptoms, one-sided yellowing, vascular discoloration, warm-weather disease development, resistant varieties, sanitation, and crop rotation guidance
• UC IPM Verticillium wilt in tomato Tomato Verticillium wilt lower-leaf yellowing, V-shaped lesions, vascular discoloration, cooler-season development, resistant varieties, crop rotation, and soilborne persistence guidance
• UMD Extension key to common tomato problems Tomato diagnostic key comparing Fusarium wilt, Verticillium wilt, bacterial wilt, root-knot nematodes, early blight, Septoria, late blight, and other wilt or leaf symptoms
• UMN Extension Fusarium wilt Fusarium wilt host crops, warm soil preference, one-sided yellowing, stem vascular browning, resistant varieties, rotation, sanitation, and diagnostic-lab context
• UMN Extension tomato plant wilt diagnosis Tomato wilt diagnostic key covering Fusarium wilt, Verticillium wilt, bacterial wilt, root injury, plant pattern, lower-leaf yellowing, and stem discoloration checks