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Stories about a mysterious 1929 'tree cancer' are best understood through the science of tree disease and environmental stress rather than as proof of invisible geopathic forces.
Galls, cankers and abnormal tissue can result from fungi, bacteria, insects, physical injury or genetic changes. Some growths resemble tumours but do not behave like human cancer.
Soil drainage, drought, flooding, pollution, frost, root damage and nutrient imbalance can create geographic patterns of tree decline.
Reliable conclusions require dated records, species identification, pathology samples, soil data and comparison with unaffected sites. A dramatic anecdote alone cannot establish a cause.
Trees are valuable indicators of environmental change. Monitoring them can reveal real problems such as disease outbreaks, changing climate and habitat stress.
Historical mysteries are useful prompts for investigation, but claims should be presented with clear sourcing and uncertainty.
