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State of California Department of Pesticide Regulation - page 29 / 104

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Hazard

Toxicity

Toxicity

Toxicity

Toxicity

Indicator

Category

Category

Category

Category

ACUTE TOXICITY CATEGORIES FOR PESTICIDE PRODUCTS

I

II

III

IV

Signal Word

Oral LD50

DANGER o

r

DANGER/ POISON

Up to and including 50 mg/kg

WARNING

CAUTION

CAUTION (or no signal word)

>50 through 500 mg/kg

>500 through 5,000 mg/kg

>5,000 mg/kg

Dermal LD50

Up to and including 200 mg/kg

>200 through 2,000 mg/kg

>2,000 through 20,000 mg/kg

>20,000 mg/kg

Corrosive;

Severe

No corneal

corneal opacity

irritation at 72

opacity;

not reversible

hours

reversible

within 72 hours

within 72 hours

Severe

Moderate

Corrosive

irritation at 72

irritation at 72

hours

hours

Inhalation LC50

Eye Irritation

Skin Irritation

No irritation

Mild or light irritation at 72 hours

>20 mg/liter

including 0.2

>0.2 through 2

>2 through 20

mg/liter

mg/liter

mg/kg

Up to and

DANGER/POISON and DANGER Pesticides

DANGER pesticides (Toxicity Category I) have an oral LD50 up to and including 50 mg/kg or a dermal LD50 up to and including 200 mg/kg. Some of these also have the words DANGER/POISON and a skull and crossbones symbol on their labels. Sulfur dioxide is an example of this type of pesticide. DANGER/POISON pesticides with the skull and crossbones symbol are the most hazardous because they are the most toxic. Less toxic pesticides may still have the signal word DANGER on their labels if they cause specific hazards. Chlorine is an example of a DANGER pesticide that has specific hazards, including severe skin or eye injury. The signal word DANGER appears on the label, but not the word POISON or the skull and crossbones symbol.

WARNING Pesticides

WARNING pesticides (Toxicity Category II) have an oral LD50 greater than 50 through 500 mg/kg or a dermal LD50 greater than 200 through 2,000 mg/kg. These are moderately hazardous.

CAUTION Pesticides

CAUTION pesticides (Toxicity Category III) have an oral LD50 greater than 500 mg/kg through 5,000 mg/kg and a dermal LD50 greater than 2,000 mg/kg. CAUTION pesticides in Toxicity Category IV have an oral LD50 greater than 5,000 mg/kg and a dermal LD50 greater than 20,000 mg/kg. The signal word CAUTION indicates they may be slightly hazardous.

WHAT ARE PESTICIDES?

21

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