Lecture 13 Flashcards
Annual grass weeds
•Meadowgrass’s
•Ryegrass’s
Perennial grass weeds
•Scutch(couch)
•Creeping bent
•Soft grass
Annual broad leaved weeds
•Chickweed
•Cleavers
•Fat hen
•Charlock
Perennial Broad leaved weeds
•Docks
•Thistles
•Creeping buttercup
Example of noxious weed
Creeping thistle (Cirsium arvense)
How many species of butterfly and moth are dependent of Creeping thistle (Cirsium arvense) for food supply
20 Butterfly
4 moth
What do annual weeds thrive on
They thrive on frequently disturbed sites such as those occurring in wheat and barley production
What type of conditions do biennials weeds persist best in
They persist best in permanent pasture, waterways, and roadside areas
Key grassland weeds found in permanent grassland
• Docks
• Nettles
• Thistles
• Rushes
• Chickweed (common and
Mouse Eared)
• Dandelions
• Ragwort
• Buttercups
Key grassland weeds found in New Leys
• Docks
• Thistles
• Chickweed(commonand
Mouse Eared)
• Annual weeds
Describe farming system method of weed control
– Crop rotation / cropping sequences
– Alternating winter and spring crops
– Grass and tillage farming systems
Describe tillage system method of weed control
Tillage practices – inversion of soil (ploughing) Shallow cultivation (non-inversion)
Example of non chemical weed control methods
•Regular Cutting (Topping) –Can work for weeds like rushes
•Tight grazing (but avoid poaching) –Sheep can keep ragwort under control
•Maintain dense sward
–Reduces bare patches which can allow weed seeds to germinate and establish
•Avoid reintroduction of weed seeds in FYM
–Docks and chickweeds can regrow in the dung patches and get established
What percentage of weed infestants cause 10% loss in forage yield
10% weed infestants
Good grazing grounds provide how many tonnes/ha DM
11.0 tonnes/ha DM
