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Eradicating Prickly Pear: Diesel Poisons Soil; Use Biological Control

Diesel: Terrible Idea

Kills plants but contaminates soil long-term, harms microbes, groundwater, and future planting.

Better: Biological Control

Cactoblastis cactorum (cactus moth) larvae bore into pads. Used successfully in Australia and Africa.

Resource

UC Davis Weed Gallery details this and other methods.

Mechanical Removal

  • Dig out entire root crown.
  • Bag and dispose (don't compost – pads root).
  • Follow-up: spot-treat regrowth with targeted herbicide (triclopyr) if needed.

Large infestations: consult county extension for approved biocontrol agents.

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