Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:14:53.4643796Z
   4
Papaya & celery boron deficiency (191)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. On papaya and celery, but boron deficiency also occurs in many other plants, for instance, brassicas (e.g., broccoli, cauliflower, turnip), sweetpotato, and palms. An important deficiency.
  • On papaya - deformed fruits, sometimes with cracks oozing latex, and stunted, brittle claw-like leaves.
  • On celery - splits across leaf bases, and wet rots on inner leaves.
  • Normal boron level in leaves is >25 ppm.
  • Cultural control: add composts, if this fails, have soil analysis done to compare boron with K, N and Ca, and check pH. Add borax as follows: (i) for papaya - spray/drench with 0.3% borax or 0.5g/tree, or spray root area (may need to increase up to 5g per tree); (ii) for celery - 2 g borax per m2 at 2 and 6 weeks.

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