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Pesticide Classification

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Questions and Answers

What is the primary basis for classifying pesticides according to the Environmental Protection Agency (EPA)?

Mode of action

Type of pest controlled

Chemical composition

Toxicity (correct)

What is the characteristic of contact pesticides?

They can only be used on specific types of plants

They only act on the local area without entering the plant (correct)

They require a specific temperature to be effective

They can enter plant tissues and transport to the desired site

What is the function of systemic pesticides in plants?

They break down the plant's cell walls

They have the capacity to enter plant tissues and transport to the desired site (correct)

They only act on the local area without entering the plant

They stimulate the plant's growth

Which of the following is an example of a systemic pesticide?

Glyphosate Signup and view all the answers

What is the key difference between contact and systemic pesticides?

Their ability to enter plant tissues Signup and view all the answers

What is the mechanism of action of chemical insecticides?

They poison the nervous systems of the target organisms. Signup and view all the answers

What is a characteristic of insecticides?

They are not species-selective with regard to targets of toxicity. Signup and view all the answers

How do insecticides compare to other pesticides in terms of acute toxicity toward nontarget species?

They have higher acute toxicity. Signup and view all the answers

What is a risk associated with the use of insecticides?

They can also harm nontarget species, including mammals. Signup and view all the answers

What is the significance of insecticides in developing countries?

They play a most relevant role in the control of insect pests. Signup and view all the answers

Study Notes

Classification of Pesticides

Pesticides can be classified into four broad types according to the Environmental Protection Agency (EPA)

Mode of Action of Pesticides

Pesticides can be categorized into two types based on their mode of action: contact and systemic pesticides
Contact pesticides:
- Only act on the local area without entering the plant
- Example: Paraquat
Systemic pesticides:
- Have the capacity to enter the plant tissues and transport to the desired site through the vascular system
- Examples: glyphosate and 2, 4-D

Insecticides and Pest Control

Insecticides play a crucial role in controlling insect pests, especially in developing countries.
Chemical insecticides used today are neurotoxicants, which act by poisoning the nervous systems of target organisms.

Toxicity of Insecticides

Insecticides are generally not species-selective, meaning they can be toxic to a wide range of organisms.
Mammals, including humans, are highly sensitive to the toxicity of insecticides.
Insecticides have higher acute toxicity towards non-target species compared to other types of pesticides.

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Description

Learn about the different types of pesticides classified by the Environmental Protection Agency (EPA) and their mode of action, including contact and systemic pesticides.