1 / 17

Weed Control

Weed Control. Topic 2044 Melissa M. Fowler. What is a Weed?. Any plant that is out of place Any plant that grows where it isn’t wanted Examples A corn plant growing in a soybean field A tulip growing in the middle of a yard. Detrimental Effects. Compete with crops for Moisture Light

jill
Télécharger la présentation

Weed Control

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Weed Control Topic 2044 Melissa M. Fowler

  2. What is a Weed? • Any plant that is out of place • Any plant that grows where it isn’t wanted • Examples • A corn plant growing in a soybean field • A tulip growing in the middle of a yard

  3. Detrimental Effects • Compete with crops for • Moisture • Light • Nutrients • Contaminate crops and their products • Off flavored milk • Weed seeds in a seed crop • Carry pathogens

  4. Detrimental Effects Cont. • Poisonous to livestock • Loco Weed • Nightshade • Milkweed • Increased production costs • Cultivation • Chemicals • Seedbed preparation • Nuisance

  5. Beneficial Effects • Prevent erosion • Provide food and cover for wildlife • Reduce leaching of minerals • Add organic matter

  6. Eradication vs. Control • Eradication • Killing every existing plant • Destroying all reproductive organs • Dormant seeds • Below ground organs • Control • Reducing existing plants • Presence of some weeds does not seriously interfere with the area’s economic use.

  7. Prevention • Use clean, weed-free seed • Use clean equipment • Grow weed-adapted crops • Watch for weed seeds in packing material or nursery stock

  8. Methods of Control • Biological • Mechanical • Chemical

  9. Biological Control • Caterpillars • Used to kill thorny shrubs • Fungus • Velvetleaf will wilt and die • No harm to crops or ornamentals • Fungal Spores • Sprayed on rice crop • Weeds controlled within 7 to 10 days • As effective as herbicides • No damage to rice

  10. Biological Control Cont. • Allelopathy • Plants produce chemicals • Chemicals harmful to other plants • Chemicals exude through plant roots or will be washed from leaves by rain

  11. Mechanical Control • Cultivation • Uproot and/or cut off roots • Mulches • Layer of plant or artificial material on soil surface • Work by cutting off light source • Burning (1800oF) • Flame directed on weeds for short time • Done in cotton • Effective for killing small weeds

  12. Mechanical Control Cont. • Flooding • Used on rice paddies • Kills non-aquatic weeds

  13. Chemical Control • Herbicides • Depend on rain to wash them into soils • Types of Application • Preplant • Preplant incorporated • Preemergence • Postemergence

  14. Herbicide Types • Contact • Kills the part of the plant that it touches (contacts) • Not carried throughout the plant • Will not kill perennial weeds • Example: Paraquat • Systematic • Blocks metabolic activity • Translocated throughout the plant • Necessary to kill perennial weeds • Example: Roundup

  15. Herbicide Types Cont. • Selective • Kills one type of plant but not another • Some will kill broadleaves, but not grasses • Others will kill some grasses and some broadleaves, but not others • Example: Atrazine • All selective herbicides are systematic BUT not all systematic herbicides are selective.

  16. Surfactants • Sticking agent added to help herbicides stick • Facilitate absorption of chemical • Also known as: Crop Oil Concentrate (COC)

  17. Active Ingredient (a.i.) • Ingredient that actually kills the plant • Pounds/ acre • Ounces/ acre • Too little will not work sufficiently • Too much will harm the crop and cause pollution • Follow label directions

More Related