kudzu and palmer amaranth weed pests
TRANSCRIPT
Kudzu Vine & Palmer Amaranth:Past, Present, and Future
Jessica LenkerPA 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 – 12Philadelphia – 10Alleghany & Chester – 6 eaYork & Lancaster – 5 eaMontgomery – 3Franklin & Westmoreland – 2 eaBerks, 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
Palmer Amaranth• What?– 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?
D Lingenfelter, Penn State University
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 LenkerPA Department of Agriculture
Botany & Weed Specialist717-787-7204