Migratory Monarch
MODERATEDanaus plexippus plexippus
Overview
New caterpillar on swamp milkweed 1. I’m afeared that this fellow will meet the same fate as the previous 8 on this milkweed (that is - get eaten). Maybe instar 2?
- Type
- Insect
- Severity
- MODERATE
- Source
- iNaturalist
Symptoms
Geographic Spread
Treatments
Targeted Insecticide Application
Apply appropriate insecticide following label directions. Timing is critical — treat during the vulnerable larval or adult emergence stage for maximum effectiveness.
Biological Control Agents
Introduce or encourage natural predators and parasitoids. Options include releasing predatory beetles, parasitic wasps, or applying Bt (Bacillus thuringiensis) for caterpillar pests.
Infested Material Removal
Prune and destroy infested branches and plant material. Remove fallen debris that may harbor eggs or larvae. Dispose of material away from healthy trees.
Recommended Products & Tools
Helpful supplies for managing Migratory Monarch. Always read and follow label directions, and confirm a diagnosis before treating.
Knocks down soft-bodied pests like aphids, mites, and scale crawlers.
Smothers overwintering eggs and crawlers; dormant or summer rates.
Soil-applied protection taken up by the tree for season-long control.
Sharp, clean cuts to remove affected wood — a tree-care essential.
As an Amazon Associate, TreeIssues may earn a commission from qualifying purchases made through these links — at no extra cost to you.
Frequently Asked Questions
What is Migratory Monarch?
New caterpillar on swamp milkweed 1. I’m afeared that this fellow will meet the same fate as the previous 8 on this milkweed (that is - get eaten). Maybe instar 2?
What are the symptoms of Migratory Monarch?
Where is Migratory Monarch currently found?
Migratory Monarch is currently active in California, Minnesota, Michigan, Kansas. It has been reported in 4 total states across the United States.
How do I treat Migratory Monarch?
Treatment options for Migratory Monarch include: Targeted Insecticide Application, Biological Control Agents, Infested Material Removal. Treatment approaches may include chemical, biological, cultural, and mechanical methods depending on the severity and context.