Paris Green
Quick Facts
- Type
- Inorganic arsenic compound (banned)
- Source
- Copper(II) acetoarsenite — a bright green pigment that doubled as insecticide in the 1800s
- OMRI Listed
- No
- Bee Safe
- No — apply in evening
- Pet Safe
- Caution
- Residual
- Permanent — arsenic does not degrade; contaminates soil indefinitely
- Best For
- Historical context only. The first insecticide arms race (1860s-1940s).
What Is Paris Green?
Arsenic disrupts ATP production and poisons multiple enzyme systems. Paris Green was the first widely used chemical insecticide in modern agriculture (1860s against Colorado potato beetle). Also used as mosquito larvicide. Contains 58% arsenic trioxide.
Source: Copper(II) acetoarsenite — a bright green pigment that doubled as insecticide in the 1800s
What Pests Does Paris Green Kill?
Paris Green is effective against the following pests:
How to Apply Paris Green
Best for: Historical context only. The first insecticide arms race (1860s-1940s).
Avoid for: ALL uses. Arsenic is a carcinogen and permanent environmental contaminant.
Residual activity: Permanent — arsenic does not degrade; contaminates soil indefinitely
Safety Profile
| Category | Rating |
|---|---|
| Bee Safety | 🔴 Toxic to bees while wet |
| Pet Safety | 🔴 Use caution around pets |
| Overall Rating | Warning — Organic but toxic or dangerous to non-targets |
Why Isn't Paris Green Working?
If Paris Green isn't delivering results, check these common failure modes:
ARSENIC — carcinogenic, bioaccumulative, permanent soil contaminant
Poisoned farm workers, livestock, and waterways
Contaminated agricultural land for generations
Banned worldwide for agricultural use