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Managing Weeds Timeliness of weed control Managing Weeds Timeliness of weed control

Managing Weeds Timeliness of weed control - PowerPoint Presentation

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Uploaded On 2022-06-28

Managing Weeds Timeliness of weed control - PPT Presentation

Weeds are best controlled within the first several weeks after a crop is planted Herbicides are more effective against smaller weeds Smaller weeds are less competitive than larger weeds Maximize profit ID: 927492

control weed crop weeds weed control weeds crop herbicides herbicide management cultural action competitive chemical timing plans provide soil

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Presentation Transcript

Slide1

Managing Weeds

Slide2

Timeliness of weed control

Weeds are best controlled within the first several weeks after a crop is planted

Herbicides are more effective against smaller weedsSmaller weeds are less competitive than larger weeds

Slide3

Maximize profit

Weed management programs should maximize profit, not just weed control

Some weeds may need 100% control if they are particularly competitive, persistent, or difficult to control

Slide4

Proper identification

Identifying weeds is important for developing effective management plans

Slide5

Weed Control

Preventative

Cultural Mechanical

Chemical

Slide6

Weed Control – Prevention

Not allowing weeds to become established

Control in non-cropland areasPlant weed-free crop seedNot spreading manure, hay, or crop residue on fields that is contaminated with weed seeds

Clean machinery between fields

Eliminate “new” weeds that appear

Slide7

Weed Control – Cultural

Altering the environment

Crop rotationCover crops and canopiesPhotos courtesy Laura Greiner

Slide8

Weed Control – Cultural

Giving crops competitive edge

Narrow row spacing (soybeans)Proper planting date and seeding rateUsing resistant varietiesInsect controlAdequate soil fertility

Adequate drainage

Seed treatments (soybeans)

Slide9

Weed Control – Mechanical

Physical disruption of the environment

Tillage (both vegetative and seed)Cultivation and rotary hoeingMowingMulching

Slide10

Weed Control - Chemical

Herbicide use

SelectiveNonselectiveBurn-down treatmentRate and timing are critical

Slide11

Herbicide Decisions

Soil-applied herbicides (

preemergence)Control weeds as seeds germinateReduce early-season weed competition

Protect yield potential

Provide residual activity

Provide greater flexibility in timing of

postemergence

herbicides

Slide12

Herbicide Decisions

Postemergence

herbicides Target weed species not controlled by soil applicationsSome control weeds emerged at the time of applicationOthers control emerged weeds and provide residual activity against later emerging weeds

Slide13

Selecting Herbicides

Considerations from the previous year

Weed escapes the previous yearEnvironmental conditions that may be favorable for carryoverHerbicide-tolerant crops used

Slide14

Selecting Herbicides

Considerations for the current year

Weeds presentHerbicide-tolerant crop plansTillage plansHerbicide resistance development

Timing

Crop rotations for future years (carryover)

Label restrictions

Slide15

Herbicide Classes

Different classes of

herbicidesMode of action - mechanism by which a herbicide kills a plantSite of action - Specific protein to which a herbicide binds, disrupting a physiological process in plants Herbicides with the same mode of action may or may not have the same site of action

Slide16

Summary

Weed management is vital for maximizing crop production.

Because weed species vary in their response to different management strategies, proper identification is essential to develop effective management plans.

Weed management plans include preventative, cultural, mechanical, or chemical control methods that are specific to the particular cropping system and weeds present.

Control methods must be employed at the appropriate time for optimum results.