10 Questions
What is the primary basis for classifying pesticides according to the Environmental Protection Agency (EPA)?
Toxicity
What is the characteristic of contact pesticides?
They only act on the local area without entering the plant
What is the function of systemic pesticides in plants?
They have the capacity to enter plant tissues and transport to the desired site
Which of the following is an example of a systemic pesticide?
Glyphosate
What is the key difference between contact and systemic pesticides?
Their ability to enter plant tissues
What is the mechanism of action of chemical insecticides?
They poison the nervous systems of the target organisms.
What is a characteristic of insecticides?
They are not species-selective with regard to targets of toxicity.
How do insecticides compare to other pesticides in terms of acute toxicity toward nontarget species?
They have higher acute toxicity.
What is a risk associated with the use of insecticides?
They can also harm nontarget species, including mammals.
What is the significance of insecticides in developing countries?
They play a most relevant role in the control of insect pests.
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.
Learn about the different types of pesticides classified by the Environmental Protection Agency (EPA) and their mode of action, including contact and systemic pesticides.
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