Mississippi

Mississippi State University Weed Control for Crops:

http://extension.msstate.edu/agriculture/crops/weed-control-for-crops

Mississippi Crops Blog: http://www.mississippi-crops.com/

Herbicide Resistant Weeds in Mississippi

Updated October 18, 2016. Jason Bond, Mississippi State University; www.weedscience.org – Mississippi

Reading this list: Each weed with herbicide resistant populations in this state is listed. Underneath each species is a list of the unique resistant biotypes of that weed in the state, according to the herbicide group(s) they are resistant to.

Palmer amaranth – Highest concern

  • Group 2 + Group 9
  • Group 3
  • Group 14

Italian ryegrass – Second highest concern

  • Group 1
  • Group 2
  • Group 9

Horseweed/marestail – Third highest concern

  • Group 22 (paraquat)
  • Group 9 + Group 22

Annual bluegrass

  • Group 2

Barnyardgrass

  • Group 1 + Group 2 + Group 26 + Group 7

Common cocklebur

  • Group 2
  • Group 17

Common ragweed

  • Group 9

Giant ragweed

  • Group 9

Goosegrass

  • Group 3
  • Group 9

Johnsongrass

  • Group 1
  • Group 3
  • Group 9

Spiny amaranth

  • Group 9

Tall waterhemp

  • Group 9