3.3 Crop Protection

Question 1

Why would a selective herbicide be used?

Answer 1

Selective herbicides have a greater effect on certain plant species (broad leaved weeds)

Question 2

Why would a systemic herbicide be used?

Answer 2

Systemic herbicide spreads through the vascular system of plants and prevents regrowth

Question 3

What do systemic insecticides do?

Answer 3

Systemic insecticides spread through the vascular system of plants and kill pests feeding on plants

Question 4

What is bioaccumulation?

Answer 4

Bioaccumulation is a build up of chemical in an organism

Question 5

What is biomagnification?

Answer 5

Biomagnification is an increase in the concentration of a chemical moving between trophic levels

Question 6

What is biological control?

Answer 6

The introduction of a natural predator, parasite or pathogen of the pest

Question 7

What is integrated pest management?

Answer 7

The use of chemical, biological and cultural control

Question 8

What are the risks associated with biological control?

Answer 8

The control organism may become an invasive species, parasite or pathogen of other species