Weed control Flashcards
1
Q
mechanical control
A
- burial (annual weeds)
- cultivation (shallow cultivation to separate weed roots but has disadvantages)
- mowing (tall growing annuals, not effective for short growing plants or perennials)
2
Q
crop competition
A
- one of the cheapest and effective methods
- need optimal conditions
- factors that will affect the competitive advantage are:
- planting date
- row spacing
- seeding rate
- planting depth
- soil moisture
- soil pH
3
Q
crop rotation
A
- reduce the population of specific weed which was tolerant to the previous crop
- rotating grasses due to effective herbicide rotation
4
Q
biological control
A
bacteria and fungi, as well as some caterpillars and/or insects, can be used
5
Q
fire
A
scheduled burning especially prior to planting will help reduce some persistent weeds
6
Q
chemical control
A
- can be administered pre-plant
- pre-emergence and post-emergence
- the application of chemical control:
- broadcast (most effective)
- band applications (with cultivation, direct applications - late in the season)
- spot treatment (isolated areas)
7
Q
herbicides
A
- classified according to where and how they are applied and their action on plants
- may be either foliage applied of soil-applied
- consists of contact or systematic materials that are translocated throughout the plant
- can be selective or non-selective
- those registered for pasture are aimed at the control of broad leaf weeds, although young grass seedlings may also be sensitive
- registered for grass pastures are all post-emergence contact killers with hormonal effect
- registered for Lucerne and other legumes are usually pre-emergence, and the herbicide must be worked into a seed bed
