Lecture 05-06 2010

Lecture 05-06 2010 - Physical and Cultural Control Methods...

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Physical and Cultural Control Methods Mechanical – Hand pulling, hoeing, weed whips – Heavy equipment – Tillage/cultivation – Cutting – Heat treatment Cultural – Water management – Mulches – Crop rotation and competition – Grazing – Prescribed burning Biological Chemical
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Hand weeding • Hand pulling • Hoes • Weeders • Shovel, pulaski, or other hand held equipment • Weed wrench for small woody species
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Principle • To remove all above and/or below ground vegetative structures • Generally ineffective on perennial plants with below ground reproductive structures that include rhizomes, bulbs, tubers, or creeping roots • Most effective on annuals
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Hula hoe
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Shovel
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Pulaski
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String or metal weeders
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• Weed Wrench – Used to pull entire trees from the ground, including the roots
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Mechanical % Control from Mechanical Treatments 0% 20% 40% 60% 80% 100% Lopping Weed Wrench Untreated Treatment % Control Fall Application Spring Application a a b a a b Scotch broom
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Suction harvesting milfoil from Lake George
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Heavy Equipment • Bulldozing • Backhoes • Dredges Goal is to remove entire below ground reproductive structure - very labor intensive and costly
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Bulldozers
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Arundo removal with backhoe
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Dredging for control of weeds in an irrigation canal, also used to reshape canal
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Tillage/cultivation • Best when weeds are small • Dry conditions after cultivation help to prevent re-rooting • Goal is to detach, damage, or bury weed parts such that they cannot recover
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Two types of tillage goals • Shallow cultivation – Knives, sweeps, harrows, discs – Cut and damage shoot and particularly root systems – Death occurs through desiccation • Deep burial – Plows – Buries shoots and root pieces too deep to recover
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Harrows
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Knives, sweeps and discs Sweep Knives
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Weed Badger
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Plow
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Deep Plowing Effect on Johnsongrass Seed 0 10 20 30 40 50 60 70 80 90 0-12 cm 12-24 cm 24-36 cm Not plowed Plowed Sampling Depth Seedlings per ft 2
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Lecture 05-06 2010 - Physical and Cultural Control Methods...

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