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Grassy Weeds

Grassy Weeds. Monocots. Crabgrass. Summer Annual Grassy. Crabgrass Control. Preemergent First treatment prior to initial germination Split applications may exceed length of control Dimension and PreM have some post activity on young crabgrass seedling Postemergent MSMA or DSMA.

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Grassy Weeds

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  1. Grassy Weeds Monocots

  2. Crabgrass • Summer Annual • Grassy

  3. Crabgrass Control Preemergent • First treatment prior to initial germination • Split applications may exceed length of control • Dimension and PreM have some post activity on young crabgrass seedling Postemergent • MSMA or DSMA

  4. Goosegrass • Summer Annual • Grassy

  5. Poa Annua • Winter Annual • Grassy

  6. Poa Annua Control Preemergent • Timing very critical • May need more than one application Postemergent • Roundup • Finale • Roundup plus Scythe

  7. Barnyardgrass • Summer Annual • Grassy

  8. Virginia Buttercup • Summer Perennial • Grassy

  9. Preemergent GrassyWeed Control • Balan • Surflan • Ronstar • Dacthal • Barricade • Pendimethalin • Team • Betasan (Lescosan)

  10. Meristematic Growth Inhibitors After the growing points or meristems in shoots or roots of seedling weeds, generally prior to their emergence Example: Balan, Treflan, Surflan, Pennant, Pendimethalin, Barricade • Generally not very leachable in the soil • Provide preemergence residual weed control • Limited movement in the plant • Selective for annual grasses and small seeded broadleaf weeds

  11. Dallisgrass • Summer Perennial • Grassy

  12. PostemergenceDallisgrass Control • Bermuda DSMA, CMA • Zoysia & MSMA • St. Augustine “spot treat” • Centipede sethoxydim

  13. Nutsedge • Yellow Nutsedge • Purple Nutsedge • Annual Nutsedge

  14. Nutsedge Control Postemerge • Manage All sedges • Image Purple nutsedge • Basagran Yellow nutsedge • MSMA Purple and yellow nutsedge

  15. Nutsedge Control Preemergent • Pennant Yellow nutsedge

  16. Weed Population 10 8 6 4 2 0 Preemerge Preemerge Winter Broadleaf Weeds Summer Broadleaf Weeds Crabgrass Poa Annua Weed Control Programs A S O N D J F M A M J J A S O Months

  17. Weed Control Programs Weed Population 10 8 6 4 2 0 MSMA Plus Hormone - Type Product Summer Broadleaf Weeds Winter Broadleaf Weeds Crabgrass Poa Annua A S O N D J F M A M J J A S O Months

  18. Weed Control Programs Weed Population 10 8 6 4 2 0 Sencor, Hormone - Type or Non-Selective Product Summer Broadleaf Weeds Winter Broadleaf Weeds Crabgrass Poa Annua A S O N D J F M A M J J A S O Months

  19. Weed Control Programs Weed Population 10 8 6 4 2 0 Summer Broadleaf Weeds Winter Broadleaf Weeds Crabgrass Poa Annua A S O N D J F M A M J J A S O Months

  20. Grassy Weed Controlin Ornamentals Preemergent • Most preemergence labeled for turf are also labeled for ornamentals • Trade name may be different Postemergent • Envoy • Fusilade II, Ornamc • Vantage

  21. Turfgrass Herbicide Characteristics

  22. Herbicide Names Example Trade Surflan Common Oryzalin Chemical 3,5-dinitro-N,N-dipropylsulfanilamide

  23. Herbicides • Understanding behavior and recognizing plant symptomology

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