Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:11:08.5484095Z
   4
Carrot leaf spot (135)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. On members of the carrot or parsley family: mostly carrot, but also celery, dill, parsley, parsnip, wild carrot. A serious fungal disease of wet weather.
  • Spots on older and then younger leaves, becoming a blight as spots merge, and leaves blacken. It also causes damping-off.
  • Spread is in wind-driven rain, and on or in seed.
  • Cultural control: certified seed or hot water (50°C for 25-30 mins.); tolerant varieties; nursery hygiene: clean trays, pasteurise soil or soilless mixes, monitor and discard infected plants; do not plant too densely; weed; collect and burn trash or plough in remains after harvest; 3-year crop rotations.
  • Chemical control: seed - captan or thiram; field – copper, mancozeb, or those in strobilurin and DMI (demethylation inhibitor) groups of fungicides, alternating with either of the first two. 

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