Unit 4: Agriculture - Reducing Pesticide Use
- Created by: rosieevie
- Created on: 18-05-15 20:26
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- Reducing Pesticide Use
- Crop Rotation
- Pest species population reduced to a low level before the crop it harms becomes available again
- Mulching
- Material added to the soil surface e.g. bark or wood chips so that weed seedlings cannot get their leaves out to reach the sun
- Barrier Crops
- Plants with unpleasant smells to deter pests e.g. onions
- Sowing Density
- Close together produces high yield and helps to suppress weeds
- Stress of overcrowding may mean more susceptible to pests and diseases
- Close together produces high yield and helps to suppress weeds
- Sowing Date
- Sowing later in spring means crops are less susceptible to pests (means lower yield)
- Pest/Disease Resistant Varieties
- Pheromone Traps
- Chemical usually attracts mates so can be used to trap one sex and prevent breeding
- Only target species affected by only used for certain species
- Chemical usually attracts mates so can be used to trap one sex and prevent breeding
- Animal Hormones
- Spray insects with hormones may cause abnormal development and death
- Biological Control
- Uses predators, parasites or diseases to control pest population
- Diseases
- Sterile-Male Techniques
- Some females only reproduce once so if they mate with a sterile male they will never produce offspring
- Crop Rotation
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