Many regions reported "bottom-up" tomato dieback in 2009 due to erratic rainfall. Tops stay green; lower leaves brown and drop.
Often weather-driven; plants may outgrow it.
Identifying and Managing Tomato Stem Rot: Blight, Wilt, and Fungicide Treatment
Yellowing Tomato Tops After Heavy Rain: Waterlogged Soil or Fungal Disease?
Transplanting Fruiting Tomato Plants: Minimizing Shock
Reviving Pale Tomato Seedlings Before Transplant
Disease Risk When Growing Tomatoes Near Untreated Plants
Growing 200+ Tomato Plants Without Stakes: Ground Culture Pros and Cons
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