Laboratory Grass and Sedge Weed Identification

A. Importance of Weed Identification.

• Growers lose millions of dollars each year in wasted chemicals, application costs, and yield losses resulting from incorrect identification of weeds.
• A successful weed control program requires correct and early identification of weeds and timely application of the appropriate herbicide.
• Proper identification is the single most important step in making a weed control recommendation.
• ?The most expensive herbicide is the one that does not work.?
• The grass family contributes more weed species than any other plant family. Of the world?s ten worst weeds, seven are grasses.

Identified Weeds include:

barnyardgrass (Echinochloa crus-galli)
red rice (Oryza sativa)
bahiagrass (Paspalum notatum)
yellow foxtail (Setaria glauca)
itchgrass (Rottboellia cochinchinensis)
vaseygrass (Paspalum urvillei)
Texas panicum (Panicum texanum)
Amazon sprangletop (Leptocloa panicoides)
dallisgrass (Paspalum dilatatum)
crowfootgrass (Dactyloctenium aegyptium)
goosegrass (Eleusine indica)
bermudagrass (Cynodon dactylon)
large crabgrass (Digitaria sanguinalis)
broadleaf signalgrass (Brachiaria platyphylla)
johnsongrass (Sorghum halepense)
giant foxtail (Setaria faberi)