field of soybeans with pigweed
U of A CES Pasture Weed Control Database
The Pasture Weed Control Database contains the same information and pictures included in the Miscellaneous Publication MP-522. The weeds are arranged alphabetically by scientific name because common names vary. For example, in Arkansas, Eupatorium capillifolium, is variously called, Dogfennel, Cypress Weed, and Texas Cedar.

Prickly Sida, Sida spinosa

Sida spinosa

The key to prickly sida control is treating early before the weeds become too well established to control. GrazonNext HL or Grazon P+D are effective on this weed in the seedling stage. As the weeds get older, the percent of control declines. Chaparral at 2.5 ounces per acre is also effective.