3.3: Crop Protection Flashcards
Define biomagnification
An increase in the concentration of a chemical moving between trophic levels
Define Bioaccumulation
The build-up of a chemical in an organism
Most pests are what?
Invertebrates
Give examples of invertebrates
Insects
Nematode worms
Caterpillar
molluscs
Plant disease can be caused by fungi, bacteria or virus which is often carried by…?
Invertebrates
What are the problems to pesticides
Can also kill non-target animals
Stays in the environment
Bioaccumulation of biomagnification on food chains
Producing resistant populations of pests
Properties of annual weeds
Rapid growth
Short life cycle
High seed output
Long-term seed viability
Properties of perenunial weeds
Storage organs
Vegatative production
Other ways to control weed, pests and disease
Ploughing
Weeding
Crop rotation
Whats a combination of chemical, biological and cultural control?
Integrated pest management
Define biological control
A natuarl predator, parasite or pathogen of a host
Effect of selective herbicide
Greater effect of certain plant species
Effect of systematic herbicide
Spreads through vascular system of plant and prevents regrowth
Effcet of systematic insecticides, molluscicide and nemticides
thye go through the vascular system of plants and kill pests that feed on them
Whats the most effective was to use a fungicide?
By predicting when the disease is going to come and prevent it from coming rather than treating it
