Arugula – Pests & Diseases

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AI Farming

October 19, 2023

Arugula - Pests & Diseases

Cabbage Worms

  • Type: Insect
  • Symptoms: Leaves display large, ragged holes or are skeletonized; evidence of dark green excrement; yellowish eggs typically found laid singly on leaf undersides by white butterflies adorned with two or three black spots on each wing.
  • Control/Prevention: Employ manual removal by handpicking; utilize row covers as a protective measure; consider introducing native plants to encourage beneficial insects; promote the growth of companion plants, especially thyme; deploy sprays containing Bacillus thuringiensis, a beneficial bacterium effective against these pests.

Downy Mildew

  • Type: Fungus
  • Symptoms: Upper leaf surfaces show yellow, angular spots that progress into brown discoloration; development of white, purple, or gray cottony growth exclusively on leaf undersides; occurrence of distorted leaves leading to defoliation.
  • Control/Prevention: Remove any remaining plant debris promptly; select arugula varieties with resistance to downy mildew; ensure optimal air circulation around plants; avoid practices that involve overhead watering, which can exacerbate the issue.

Flea Beetles

  • Type: Insect
  • Symptoms: Presence of numerous tiny holes in leaves, akin to the damage caused by birdshot.
  • Control/Prevention: Implement the use of row covers as a protective measure; apply heavy mulching to deter the insects; consider introducing native plants that attract beneficial insect predators to the area.

White Rust

  • Type: Fungus
  • Symptoms: Development of chalk-white blisters, primarily located on leaf undersides; appearance of small, yellow-green spots or blisters, occasionally forming a circular pattern, on upper leaf surfaces; potential distortion or galls observed; stems may also become affected.
  • Control/Prevention: Immediate removal of infected plants; prefer arugula varieties known for their resistance to white rust; implement proper weeding practices; swiftly eliminate any remaining crop residue; practice crop rotation to reduce the likelihood of disease recurrence.
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