Transcript Why are weeds - WCMS Agriscience
Pesky Weeds
Agriscience Mr. Bailey
Weeds Around Kentucky!
CREEPING CHARLIE KY. BLUEGRASS THISTLE
•
What is a Weed?
A weed is a plant that grows where it is not wanted
• Examples o Wheat growing in an oat field; the wheat is considered a weed.
Why are weeds
considered
pests
?
• Weeds can be considered pests for many different reasons. They can:
1. Harbor insects and disease 2. Compete with agricultural crops for sunlight, water and nutrients 3. Grow to big sizes and can block sunlight from other plants
Why are weeds
considered
pests
?
4. It can sometimes lower the quality of the crop 5. If incorporated with grain it is not as good for animals or humans
o
Sometimes the seed can even be poisonous
6.
Seed fast and spread quickly
Let’s identify some practices!
How are weeds controlled?
• People have many ways of controlling weeds •
Hoeing or pulling up weeds
•
Animals have been used
•
The best way is herbicides
•
What is a herbicide?
A substance that is used to kill plants
There are two kinds of herbicides:
1. Selective- these will kill only certain types of plants 2. Non-selective- these will kill all plants that it comes in contact with
Herbicides used in the Agriculture Industry!
Exit Slip
1. Explain what a weed is in Agriculture.
2. Name three ways that weeds can be controlled in Agriculture.
3. Name the two kinds of herbicides used in the Agriculture Industry.