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Phytophthora Root Rot in Boxwood

How to identify and treat phytophthora root rot in Boxwood.

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Boxwood care requirements

water
Regularly when establishing. Moderate once established.
soil
Well-draining, fertile soil.
light
Full sun to partial shade.
symptoms

Symptoms to look for in Boxwood

  • fiber_manual_recordWilting, yellowing, or thin, sparse foliage despite adequate watering
  • fiber_manual_recordDark, mushy, foul-smelling roots that slough off outer tissue when squeezed
  • fiber_manual_recordSlow decline in growth and eventual plant death
help

Common causes in Boxwood

Caused by soil-borne Phytophthora species that produce motile spores which thrive and spread in waterlogged, poorly drained soil, infecting fine feeder roots first.

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How to treat phytophthora root rot in Boxwood

Improve drainage immediately, reduce watering frequency, and remove severely affected plants; fungicide drenches may help protect valuable plants caught early.

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Preventing phytophthora root rot in Boxwood

Plant in well-drained soil or raised beds, avoid overwatering, and choose resistant rootstocks or species in areas prone to wet soil.

Phytophthora Root Rot in Boxwood — Symptoms & Treatment | GreenScout