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WEED CONTROL. What is a Weed?? What is a Weed? A weed is a plant growing where it is not wanted. Ex....
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Transcript of WEED CONTROL. What is a Weed?? What is a Weed? A weed is a plant growing where it is not wanted. Ex....
WEED CONTROL
What is a Weed??
What is a Weed?
• A weed is a plant growing where it is not wanted.• Ex. Red rice,
Giant Ragweed
How do weeds affect us??
• 2-Brainstorm….What are some affects of weeds on our everyday life?
6 Ways Weeds affect Humans
• Housing pest• Impurities in crops• Poisonous• Allergies• Costly• Aesthetic • Impure seed products
6 ways weeds affect humans
• Housing insects and disease.• Impurities in agriculture
products.–Ex.-red rice causes lower yields.
• Poisonous to livestock.• Allergic reactions-common
ragweed
Why do weeds cost $$?
• Competition for water and nutrients.• Competition reduces crop yields.• Expense of herbicides.• Contamination of seeds• Aesthetics
How do weeds compete with crops?
• Uses nutrients intended for crops.• Competes for growing space.• Interferes with harvest.• Crowds out crops and allows for crop
loss.
Review
• Define weed• The effects of competition on the crop
or yields• The effects of weeds on humans and
livestock• The aesthetic effects of weeds in home
yards and public areas• The economic effects on crop yields.
Identifying Weeds
• Weeds can be classified based upon their:– Lifecycle– Persistence– Leaf Structure
Weed Lifecycles
• Annuals- – Grow from seed and complete their life cycle in
one growing season
• Biennials-– Complete their life cycle in two growing seasons
• Perennials– Require two or more years to complete their
lifecycle
Persistence• Common Weeds: – These are more persistent and may or may not be
vigorous.– Cause serious problems to farmers because they reoccur
so often– Mostly annuals
• Noxious Weeds:– Most undesirable– Persistent growth makes them hard to control
• Leaf Structure:– Grasses– Broadleaf
Identifying Common Weeds
• Weed ID Project– You must collect 15 different common weeds– Label each weed, identifying their:• lifecycle• Persistence• leaf structure.
Review
• Major Weed Categories:– Lifecycle• Annual• Biennial• Perennial
– Persistence• Common• Noxious• Leaf structure
– Weed ID Project
Student Learning Objective
• Describe the methods of weed control.• Determine the use of chemicals to control
weeds.• Explain alternative methods of weed control.• Describe methods of weed management.
Methods for weed control1. Mechanical: hand pulling, hoeing, tractor cultivation, etc.
2. Biological: using parasites, predators, genetic engineering, etc
3. Cultural: cropping practices, host resistance, sanitation, varying planting dates
4. Chemical controls: use of herbicides.
•Herbicides are classified as either:
- Selective - kill only certain types of plants- Nonselective - kill all plants they come in contact with
- Herbicides are classified further according to the time they are applied.
- Pre-emergent- Post-emergent
What is the most common control practice? Why?
• Chemical control is still the most popular form.
What information must be listed on a pesticide label?
What information must be listed on a pesticide label?
• Brand, trade, or product name• Ingredient statement • Manufacturer • Registration number• Establishment number • Classification statement• Directions for use• Signal words and symbol• Precautionary statements
What information must be listed on a pesticide label?
• Statement of practical treatment• Environmental hazard statement• Re-entry statement• Storage and disposal statement
Mixing and Loading Pesticides
• Follow all instructions provided on the pesticide label.
• The most serious pesticide poisonings occur during mixing and loading.
Protective Clothing and Equipment• Refer to the pesticide label to determine the proper
protective clothing and equipment to use.
• Look for the signal words on the label.– Caution– Warning – Danger
Applying Pesticides• Some pesticides require extra personal protective
equipment.
• This is why it is important to follow all information provided on the label.
Alternative Methods of Weed Control• Hoeing and hand weeding• Use of mulch to smother weeds• Cultivating • Mowing• Burning
Disadvantages of Alternative Weed Control
• Labor intensive
• Unrealistic for large crops and pastures
Integrated Pest Management(IPM)
• Used to:
– Manage crop diseases
– Managing insect pests
– Managing weeds
What information must be listed on a pesticide label?
• Brand, trade, or product name• Ingredient statement • Manufacturer • Registration number• Establishment number • Classification statement• Directions for use• Signal words and symbol• Precautionary statements
What information must be listed on a pesticide label?
• Statement of practical treatment• Environmental hazard statement• Re-entry statement• Storage and disposal statement
Weeds Classed According to Lifecycle
• Annuals
• Biannuals
• Perennials
Weeds Classed According to Plant Type
• Grasses
• Broad Leaves
• Sedges
Weeds Classed According to Persistence
• Common Weeds
• Noxious Weeds