The categories of hazard are:
The degree of risk is represented by symbols taken from common traffic signal sign shapes represented by the
Signal word is danger (high risk)
Signal word is warning (moderate risk)
Signal word is caution (low risk).
The label on the container will carry the appropriate signs for the protection of the user.
Oral LD50 Values
As They Relate to
Risk - Hazard symbols
LD50 values are used to rate the toxicity of pesticides.
The LD50 refers to the dose of pesticide(in mg per kg of the test animal's body weight) that is lethal to 50 percent of the group oftest animals.
For example, if a pesticide has a LD50value of 10 mg/kg, and the test animals each weigh 1kg.
Then 50 percent of the animals would die if they each ate 10 mg of the pesticide.
LD 50 less than 500 mg/kg
Indicates high toxicity
LD50 500-1000 mg/kg
Indicates moderate toxicity
LD50 1000-2500 mg/kg
Indicates low toxicity
LD50 > 2500 mg/kg
Indicates very low toxicity
Different types of protective equipment are required for pesticides that differ in toxicity.
Special equipment requirements are described on the product label.
But in general, the following precautions must be taken when using pesticides of dierent hazard ratings.