-Inhibitor of amino acid derivative

-Inhibites glutamine sythesis which is important to metalbolize nitrogen

-Applied post-emergence

-Yellowing and wilting within 3 to 5 days

-Death occurs within 12 days

-Yellowing in foliage followed by death

  -Highly susceptible: 4-7 days

  -Less susceptible: 10-20 days

-New growth effected first

-Inhibites EPSP sythesis

-Involves production of shikimic acid

-Amino acid inhibitor

-Applied post-emergence

-Tightly bound by soil particles

-Inhibitor of ALS

-Inhibitor of AHAS

-Subfamily, sulfonyureas

-Pre or Post emergence

-Growth stops at growing points

  -Roots and shoots

-Veins turn light to dark purple

-Chlorosis followed by nerosis over 3 weeks

-Growth regulator

-"Sythetic auxin"

-Applied post emergence, absorbed by roots and shoots

-Appear within hours of application

-Stems and petioles are twisted or malformed

-Leaf cupping and curling

-Stunted seeding

-Stem calluses

Death occurs 3-5 weeks

-Photosythesis inhibitor

-"Triazine" sub family

-Applied as pre-emergence

-Can be applied as post with adjuvant

-Symptoms first appear on older leaves

-Leaves turn yellow between the veins and leaf margins

-Roots not effected

-Chlorosis continues until plants are stunted and die

-Meristematic (Growth) Inhibitor

-Applied preplant incorporated or preemergence

-Susceptible weeds fail to emerge

-Stunted plant shoots and leaf crinkling

-Seeds may leafdout underground

-Grass seedling leaves may not unfurl

-Broadleaves may have cupped or crinkled leaves

-Triketone, a pigment inhibitor

-Applied pre or postemergence

-Bleaching

-Necrosis

-Symptoms appear within 3-5 days after application

-Meristematic (Growth) inhibitors

-Most commonly applied preplant incorporated

-Susceptible plants fail to emerge

-Plants exhibit swollen or clubbed roots and lack lateral roots

-Grass species might turn purple due to lack of nutrient uptake

-Stems might be brittle

-Cell membrane disruptors

-Applied postemergence

-Rapid wilting and desicattion within hours of application in bright sunlight

-Rapid death of target plants in 1 to 3 days

-Syptoms only where droplets land

-Lipid synthesis inhibitors

-Applied postemergence

-Symptoms take 1 to 3 weeks to develop

-Symptoms appear on grasses only

-Growing point of plant becomes necrotic

-Plants are stunted