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Kudzu Vine & Palmer Amaranth:
Past, Present, and Future

Jessica Lenker
PA Department of Agriculture
Kudzu
• The vine that ate the South…..and the North!
• 1876 - Pennsylvania introduces kudzu at the Centennial
Exposition
• 1920s - Florida nursery promotes it as a forage plant and
sells it mail order
• 1930s - Soil Conservation Service offered incentives for
planting kudzu for erosion
• 1950s - government stopped
promotion
• 1970s - it was declared a weed
• 1989 - Pa Noxious Weed
• 1997 - Federally Noxious Weed
Kudzu Eradication Program
• Grant funded 2005-2008
• 89 spatially distinct
populations (137 individual
properties)
– 47 sites treated by PDA
– 11 sites treated by owner
under PDA advisement
– 31 sites untreated/not
monitored

• By the end of the program
about 50% were eradicated
or almost eradicated.
Current Status
Delaware – 12
Philadelphia – 10
Alleghany & Chester – 6 ea
York & Lancaster – 5 ea
Montgomery – 3
Franklin & Westmoreland – 2 ea
Berks, Cambria, Lebanon, & Northampton – 1 ea
Close up of Delaware and Philadelphia counties
Kudzu Locations
– Roadside forest
– Abandoned lots
– Riparian areas
Small Populations
Large Populations
Managing Kudzu
• Starts with correct identification!
– Grape Vine
– Bur Cucumber

• PDA monitoring
– Yearly site visits to assess progress
– Aid in management strategies
– Educate landowners

• Kudzu managers include homeowners, DCNR,
municipal workers, & universities
• Notify PDA if you think you have a new site
Managing Kudzu
• Eradication is possible, but
the work is tedious…
• Each site is different
– What’s under the kudzu?
– Terrain workable?
– How old is the population?
Managing Kudzu
•
•
•
•

Foliar Spray
Cut Stump Method
Stump Drilling
Mechanical
Palmer Amaranth – Amaranthus palmeri
• What?

Palmer Amaranth

– Pigweed species like no other
– First PA discovery Sept 2013
• 5 Lancaster, 2 Franklin, 1 Berks & 1
Bedford

– Produces 500,000+ small seeds
from one plant
• Spread over an acre, 10 seeds per
square foot

– Resistant to some herbicides
including glyphosate
– Moved up from the southern
states initially
• Manure – hay, feed
• Equipment
Palmer Amaranth
• What?
– Thrives in hot, dry conditions
– Summer annual – germinates late spring/early summer
– Seeds need light to germinate
• Deep tillage for first year

– Diocious – separate male and female plants
– Genetically diverse plant - hybrids
– Pollen from male plant is what carries the glyphosate
resistant gene
• Pollen can travel ½-1 mile
Palmer Amaranth
• How to Identify?
– Unusually tall – 6-10 feet
– Long seed heads – 10-12
inches
– Prickly seed heads –
female
– Petiole is as long if not
longer than the leaf –
droopy appearance
– Stems/leaves hairless,
smooth
– Did it survive herbicide
applications?
Grew 4 inches in 52 hours

Images: University of Georgia
Managing Palmer Amaranth
• Each site will be managed differently
• BMPs – Containment!
– Pull out plants out destroy (burn/bury) on site
– Mow down the weed
– Thoroughly clean equipment and anyone in the
contaminated field
Palmer Amaranth
• Why do we care?
– Decreased crop yields – 30-50%
– Economics of eradicating
– Quarantine of ag products between states
– Decreased property values

• What to do?
– Education, education, education!
– Scout early and often
– Pay attention to field inputs and where they are coming
from
– If palmer is suspected anywhere in PA in any quantity
notify PSU (Curran or Lingenfelter) or PDA (Jessica Lenker).
Questions?
Jessica Lenker
PA Department of Agriculture
Botany & Weed Specialist
717-787-7204
jeslenker@pa.gov

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Kudzu and Palmer Amaranth Weed Pests

  • 1. Kudzu Vine & Palmer Amaranth: Past, Present, and Future Jessica Lenker PA Department of Agriculture
  • 2. Kudzu • The vine that ate the South…..and the North! • 1876 - Pennsylvania introduces kudzu at the Centennial Exposition • 1920s - Florida nursery promotes it as a forage plant and sells it mail order • 1930s - Soil Conservation Service offered incentives for planting kudzu for erosion • 1950s - government stopped promotion • 1970s - it was declared a weed • 1989 - Pa Noxious Weed • 1997 - Federally Noxious Weed
  • 3. Kudzu Eradication Program • Grant funded 2005-2008 • 89 spatially distinct populations (137 individual properties) – 47 sites treated by PDA – 11 sites treated by owner under PDA advisement – 31 sites untreated/not monitored • By the end of the program about 50% were eradicated or almost eradicated.
  • 4. Current Status Delaware – 12 Philadelphia – 10 Alleghany & Chester – 6 ea York & Lancaster – 5 ea Montgomery – 3 Franklin & Westmoreland – 2 ea Berks, Cambria, Lebanon, & Northampton – 1 ea
  • 5. Close up of Delaware and Philadelphia counties
  • 6. Kudzu Locations – Roadside forest – Abandoned lots – Riparian areas
  • 9. Managing Kudzu • Starts with correct identification! – Grape Vine – Bur Cucumber • PDA monitoring – Yearly site visits to assess progress – Aid in management strategies – Educate landowners • Kudzu managers include homeowners, DCNR, municipal workers, & universities • Notify PDA if you think you have a new site
  • 10. Managing Kudzu • Eradication is possible, but the work is tedious… • Each site is different – What’s under the kudzu? – Terrain workable? – How old is the population?
  • 11. Managing Kudzu • • • • Foliar Spray Cut Stump Method Stump Drilling Mechanical
  • 12.
  • 13. Palmer Amaranth – Amaranthus palmeri
  • 14. • What? Palmer Amaranth – Pigweed species like no other – First PA discovery Sept 2013 • 5 Lancaster, 2 Franklin, 1 Berks & 1 Bedford – Produces 500,000+ small seeds from one plant • Spread over an acre, 10 seeds per square foot – Resistant to some herbicides including glyphosate – Moved up from the southern states initially • Manure – hay, feed • Equipment
  • 15. Palmer Amaranth • What? – Thrives in hot, dry conditions – Summer annual – germinates late spring/early summer – Seeds need light to germinate • Deep tillage for first year – Diocious – separate male and female plants – Genetically diverse plant - hybrids – Pollen from male plant is what carries the glyphosate resistant gene • Pollen can travel ½-1 mile
  • 16. Palmer Amaranth • How to Identify? – Unusually tall – 6-10 feet – Long seed heads – 10-12 inches – Prickly seed heads – female – Petiole is as long if not longer than the leaf – droopy appearance – Stems/leaves hairless, smooth – Did it survive herbicide applications?
  • 17. Grew 4 inches in 52 hours Images: University of Georgia
  • 18. Managing Palmer Amaranth • Each site will be managed differently • BMPs – Containment! – Pull out plants out destroy (burn/bury) on site – Mow down the weed – Thoroughly clean equipment and anyone in the contaminated field
  • 19. Palmer Amaranth • Why do we care? – Decreased crop yields – 30-50% – Economics of eradicating – Quarantine of ag products between states – Decreased property values • What to do? – Education, education, education! – Scout early and often – Pay attention to field inputs and where they are coming from – If palmer is suspected anywhere in PA in any quantity notify PSU (Curran or Lingenfelter) or PDA (Jessica Lenker).
  • 20. Questions? Jessica Lenker PA Department of Agriculture Botany & Weed Specialist 717-787-7204 jeslenker@pa.gov