Tomato Death in Sandy Florida Soil: Nematode Diagnosis and Management

Tomatoes Withering and Dying in NE Florida Sand: Root-Knot Nematodes

3 of 15 plants lost, leaves wither, plant dies in sandy soil—nematodes are the prime suspect, not cutworms/mole crickets (which cut leaves visibly).

Nematode Confirmation

1. Dig up declining plant—wash roots gently
2. Look for galls: Swollen, knobby roots (not nitrogen nodules which are pink inside)
3. White females visible: Tiny white pearls on root surface = root-knot nematodes

Poison Complication

Unknown "poison in soil" may have damaged survivors. Flush beds thoroughly (1 inch water × 3 days) then re-fertilize.

Florida Sandy Soil Nematode Management

• Solarize: Clear plastic 6-8 weeks summer (FL heat achieves 130°F+)
• Resistant varieties: 'VFN' tomatoes (Better Boy VFN, Celebrity VFN)
• Grafted plants: Resistant rootstock (Maxifort, Beaufort)
• Container culture: 15-gal pots with sterile mix—avoids soil entirely
• Mustard biofumigant: 'Caliente 199' tilled at bloom
• Crop rotation: 3 years non-solanaceous (sweet corn, beans, brassicas)

Immediate for Remaining Plants

• Mulch 4 inches straw—cools soil, reduces nematode activity
• Kelp drench monthly—improves root tolerance
• Harvest promptly—reduces plant stress

In FL sand, nematodes are endemic. Resistant varieties + containers + solarization = viable tomatoes.