3.3 - Crop Production Flashcards
What are the properties of Annual Weeds?
- Rapid Growth
- Short life cycle
- High seed output
- long term seed viability
What are the properties of Perennial Weeds?
- Storage Organs
- Vegetative reproduction
What can plant disease be caused by?
It can be caused by Fungi, Bacteria or Viruses, which are often carried by invertebrates
What are the cultural methods which control weeds, other pests and disease?
- Ploughing
- Weeding
- Crop Rotation
Why are Selective herbicides used?
They are used since they have a greater effect on certain plant species (broad leaved weeds)
What is the affect of Systemic herbicides?
They spread through the vascular system of plants and prevent regrowth
What is the affect of Systemic insecticides, molluscicides and nematicides?
They spread through the vascular system of plants and kill pests feeding on plants
What is Bioaccumulation?
It is the build up of a chemical in an organism
What is a Control Agent?
It is a natural predator, parasite or pathogen of the pest
What is Integrated Pest Management?
It is a combination of chemical, biological and cultural control
What is Biomagnification?
It is the increase in the concentration of a chemical moving between trophic levels
