Crop protection Flashcards
Properties of annual weeds
Rapid growth
Short life cycle
High seed output
Long term seed viability
Properties of perennial weeds
Longer life cycle
Low seed output
Storage organs
Vegetative reproduction
What can plant diseases be caused by
Bacteria
Fungus
Virus
Carried by invertebrates
What do weeds and disease to do crops
Reduce productivity
Cultural means Of controlling pests and diseases
Ploughing
Weeding
Crop rotation
What do selective herbicides
They are affective against broad leaved weeds
What do systemic herbicides do
Spread through the vascular system of and plant and prevent regrowth.
Problems of pesticides
Can cause resistance and persistence in pests
What is bioaccumulation
The build up of toxic chemicals in an organism
What is bio magnification
Toxic chemicals becoming more concentrated as they pass though the food chain.
What is integrated pest management
The combination of chemical biological and cultural control.
Problems with biological control
Control organism may become an invasive species.
