R2103 1.3 Describe the selection of plants that can help avoid plant health problems Flashcards
1
Q
Example of appropriate use of a resistant cultivar
A
Malus pumila ‘Northern Spy’ has major gene resistance to woolly apple aphid
2
Q
Two examples of an appropriate choice of plant in a named situation
A
- Camellia vernalis dont like a chalky soil, they will be stressed by lack of available nutrients and turn yellow. Under stress plant will be more susceptible to attacks by pests and disease
- Rose prefer a clay soil. On a dry, thin, sandy soil roses will be stressed and have less chance of surviving diseases such as black spot and rust
3
Q
Benefits of resistance control
(how plant resistance is beneficial)
A
- Selected resistant plant/cultivar produces appropriate chemicals that work inside the plant
- Resistance may greatly reduce the need for chemical control
4
Q
Benefits of correct species
‘right plant, right place’
A
- Optimum plant growth is achieved
- Healthy plants are usually less prone to disease and pests
5
Q
Suitable plants for different soils and locations
A
- Acid soil - Azalea japonica
- Moist shade - Skimmia japonica
- Alkaline soil - Clematis montana
6
Q
Suitable plants for different locations:
Acid soil
Alkaline soil
Moist shade
A
- Acid soil - Azalea japonica
- Moist shade - Skimmia japonica
- Alkaline soil - Lavandula augustifolia
7
Q
Problems with resistant cultivars (4)
A
- Trade offs - resistance at the expense of flavour, yield or quality
- A cultivar resistant to one disease may be more susceptible to another
- New strains of disease or pest may overcome resistance
- Resistance will not guarantee total crop protection
8
Q
What is a balanced polycultural system
A
A good level of pathogen population is useful. It indicates the environment is healthy and diverse and adds to overall robustness of the system and allows an immunity to some pathogens build up
