06/18/2026
What Are Those?
Friend or Foe? IPM Edition
📸 Meet the looper caterpillar.
🟡 Friend or Foe? Moderate Foe
A few loopers are usually not a concern. However, large populations can quickly chew foliage and skeletonize leaves, reducing plant vigor and affecting the appearance of ornamental plants.
Common Host Plants
• Cabbage, kale, broccoli, cauliflower
• Lettuce and spinach
• Tomatoes
• Peas and beans • Roses • Hydrangeas
• Petunias and annual flowers
• Many trees and shrubs
What to Look For
• Holes in leaves
• Ragged leaf edges
• Skeletonized foliage • Green or black frass (droppings)
• Caterpillars hiding on leaf undersides
IPM Approach
✔ Monitor regularly and identify early
✔ Hand pick when populations are low
✔ Encourage birds, parasitic wasps, and other natural predators
✔ Tolerate minor feeding on healthy plants
✔ Use Bt (Bacillus thuringiensis var. kurstaki) when populations exceed acceptable damage thresholds
Wise Roots Verdict A few caterpillars are part of a healthy ecosystem. When feeding becomes widespread or plants begin losing significant leaf area, it's time to step in with targeted management.