1. 1 Tim Murphy Extension Weed Scientist University of Georgia Newer Weed Management Tools in Grazed Pastures 2010 Georgia Grazing School Perry, GA

2. 2 Weed competition, how serious is it?

3. 3 Common Bermudagrass, Ragweed and Nitrogen Lbs/bermuda/ac N = 34 lbs/ac

4. 4 Fertility Examples for the Southeast  Broomsedge  General indicator of low pH (<5.4), low P and low K  Affected by grazing  Sericia lespedeza  Extremely tolerant of low pH, P and K  Bahiagrass and Common bermudagrass  More tolerant of low K than hybrid bermudagrass  Also more tolerant of close grazing

5. 5 Rule of thumb: When weeds are more than 20% of the pasture. What is the Economic Threshold? Woolly croton

6. 6 Do I spray or fertilize first?  Spray first.  Control existing weeds.  Begin soil-test based lime and fertilizer program.

7. 7 Grazing for Weed Control Small weeds are more palatable Many weeds have comparable protein levels to forages Good fencing and cattle numbers are needed

8. What do animals prefer? S. Forages 3 rd Ed.

9. 9 Broomsedge is intolerant of early, heavy continuous grazing Moulton, AL

10. 10 Examples of plants intolerant of heavy, continuous grazing  Kudzu  Johnsongrass  Little barley (highly dependent upon timing)  Dogfennel (sheep)  Briars (goats)

11. 11 Do we really want to eliminate all weeds from pastures?

12. Digestibility of select cool season weeds Hoveland et al., 1986

13. Digestibility of select warm season weeds Hoveland et al., 1986

14. 14 “Weeds” in grazing situations serve multiple purposes  Can dilute toxins in tall fescue during critical times  Chickweed, crabgrass, dallisgrass, lespedeza  Can extend grazing season and improve productivity  Crabgrass in tall fescue  Can improve quality  Crabgrass and Johnsongrass Chickweed, curly dock, shepherds purse and tall fescue mixture. Eatonton GA

15. 15 Spray or Bush Hog? About $10/acre including 1 qt/a 2,4-D About $12 to $14/acre More than $12/acre

16. 16 Mowing  Too late to prevent competition.  No selectivity.  Perennials will regrow.  May prevent weed seed production.  Consistency is key to effective weed control with mowing.

17. 17

18. 18 Mowing  Mowing 3 times per year for 2 years provided 80 to 90% control of ironweed and goldenrod.

19. 19  Late summer mowing of dogfennel provided 80% control

20. 20 Herbicides and Legumes  Establish legumes after good weed control has been practiced for 1 to 2 years.  2,4-D amine is safe on white clover and lespedeza.

21. 21 Haying and Grazing Restrictions for Dairy Animals (Cattle and Goats) LactatingNon-lactating HerbicideGrazingHayGrazingHay Metsulfuron0000 Cimarron Plus0000 Milestone0000 Forefront0707 Chaparral00 (14d)0 Grazon P+D7300 Remedy14NS*07 Weedmaster7370 2,4-D7777 *Next season.

22. 22 Haying and Grazing Restrictions for Various Livestock Species BeefHorsesGoatsBeefHorsesGoats HerbicideGrazingHay Metsulfuron000000 Cimarron Plus000000 Milestone000000 Forefront000777 Chaparral0000 (14) Grazon P+D00030 Remedy000777 Weedmaster00037 2,4-D000777

23. 23 When do you spray?  Winter annuals - henbit, chickweed, buttercups, thistles November through March  Summer annuals - spiny amaranth, bitter sneezeweed April through mid-July  Perennials growth stage dependent

24. 24 Spray this size Not this size Bitter sneezeweed

25. 25 Herbicide Options 1.2,4-D 2.dicamba (Vanquish, Banvel) 3.2,4-D + dicamba (WeedMaster, others) 4.dicamba+ diflufenzopyr (Overdrive) 5.diuron (Direx, Diuron) 6.triclopyr (Remedy) 7.imazapic (Impose,Panoramic) 8.2,4-D + triclopyr (CrossBow) 9.triclopyr + clopyralid (Redeem) 10.2,4-D + picloram (Grazon P+D, HiredHand, GunSlinger) 11.fluroxypyr + picloram (Surmount) 12.fluroxypyr + triclopyr (PastureGard)

26. 26 Herbicide Options (cont.) 13.aminopyralid (Milestone) 14.aminopyralid + 2,4-D (ForeFront) 15.aminopyralid + metsulfuron (Chaparral) 16.Nicosulfuron + metsulfuron (Pastora) 17.metsulfuron (Cimarron, MSM E.Pro, others) 18.metsulfuron + chlorsulfuron (Cimarron Plus) 19.metsulfuron + 2,4-D + dicamba (Cimarron MAX) 20.hexazinone (Velpar) 21.sulfosulfuron (OutRider) 22.pendimethalin – Prowl H 2 O 23.tebuthiuron (Spike) 24.paraquat (Gramoxone Inteon, Firestorm, Parazone) 25.glyphosate (Roundup PowerMax, others)

27. 27 Newest Herbicides  PastureGard - fluroxypyr + triclopyr (Remedy)  Surmount – fluroxypyr + picloram  Milestone – aminopyralid  ForeFront – aminopyralid + 2,4-D  Chaparral – aminopyralid + metsulfuron  OutRider – sulfosulfuron  Prowl H 2 O – pendimethalin  Pastora - nicosulfuron + metsulfuron

28. 28 PastureGard  1.5 lbs./gal. triclopyr ester + 0.5 lbs./gal. fluroxypyr ester  Controls numerous brush species and broadleaf weeds.  Upright blackberry, sweet gums, Sericea lespedeza, dogfennel, gallberry, rose species, lantana  Palmetto and yucca – use 2.0% v/v solution in water  Fair control of horsenettle and tropical soda apple  Also has activity on maypop passionflower

29. 29 Reseeding Restrictions – PastureGard  Cool-season grasses and small grains - 21 days  Clover and other legumes – 30 days  Other crops – 120 days  Labeled for use on permanent grass forage systems  This includes permanent pastures that are overseeded with winter forages.

30. 30 Surmount  1.19 lbs./gal. picloram amine + 0.96 lbs. gal. fluroxypyr amine  Controls broadleaf weeds, horsenettle, tropical soda apple, and pricklypear cactus.  Apply 3 to 4.0 pts./acre for prickly pear cactus in fall months, control is very slow, about 2 yrs.  About 30 d residual control  Excellent control of upright-growing blackberry (3 to 4 pts./acre)

31. 31 Reseeding Restrictions – Surmount  Cool-season grasses - 21 days  Clovers – 12 months  Other legumes – 12 months

32. 32 Surmount- It’s Good - BUT!!!!!  Do not  use hay from treated areas for compost or mulch  transfer livestock to untreated areas without 7 d cleanout  use manure for fertilizing broadleaf crops  use in any temporary forage system involving broadleaf crops  USE ONLY ON PERMANENT GRASS FORAGE SYSTEMS

33. 33 Milestone  2.0 lbs./gal. aminopyralid  Use rate: 4.0 to 7.0 fl. ozs./acre  Numerous broadleaf weeds – thistles, horsenettle, tropical soda apple, buttercup  Do not seed legumes year of application (additional research being conducted)  Delay application until grasses have 4 to 5 leaves.

34. 34 Milestone  Non-volatile  Injurious to legumes  No grazing or hay restriction for any type of livestock  Weak on sida species, dogfennel, plantains, blackberry, wild radish, other mustards.  Add 2,4-D or Remedy for weeds above.

35. 35 ForeFront  0.33 lbs./gal. aminopyralid + 2.67 lbs./gal 2,4-D  Use rate: 1.5 to 2.6 pts./acre  Numerous broadleaf weeds – thistles, horsenettle, buttercup, henbit, plantains, verbena  Do not seed legumes year of application (additional research being conducted)  Delay application until grasses have 4 to 5 leaves.

36. 36 ForeFront  Injurious to legumes  No grazing restriction for any type of livestock.  7 day hay harvest restriction  Better control of plantains and common pokeweed than Milestone

37. 37 Chaparral  Bermuda, orchardgrass, tall fescue (up to 2.0 oz/a  Native grasses – wheatgrass, bluestems, grama  Apply to fully tillered or established  Same tall fescue precautions as metsulfuron products (2 yr establishment)

38. 38 Chaparral Rate (oz. product/a) Act. Ingredient1.52.0*3.0 aminopyralid0.0490.0660.098 metsulfuron0.0090.0120.018 *Chaparral at 2.0 oz./a = 4.0 fl. oz/a of Milestone 2SC + 0.3 oz/a Metsulfuron 60DG

39. 39 Chaparral  Non-volatile  Injurious to legumes  Do not seed legumes year of application (additional research being conducted)

40. 40 Aminopyralid- It’s Good - BUT!!!!!  Do not  use hay from treated areas for compost or mulch  transfer livestock to untreated areas without 3 d cleanout  use manure for fertilizing broadleaf crops  use in any temporary forage system involving broadleaf crops  USE ONLY ON PERMANENT GRASS FORAGE SYSTEMS

41. Grass Control Options - Bermudagrass  Dormant bermuda  Glyphosate – 1.0 pt./acre (4.0 lb./gal.)  Gramoxone Inteon – 1.0 to 2.0 pts./acre  Active Growth Bermuda  ‘Pensacola’ bahiagrass – Cimarron, Chaparral, Impose  Smutgrass – Velpar  Annual grasses  Roundup PowerMax, after first hay cut  Impose (imazapic)  Johnsongrass – OutRider, Impose  Spot treat or ropewick glyphosate

42. 42 Prowl H 2 0 - BASF  Pendimethalin  Preemergence herbicide: 3.2 to 4.2 qts/acre  Needs rainfall for incorporation within 30 days of application  Labeled on dormant forage bermudagrass hay or pasture (NOT LABELED ON TALL FESCUE)  45 day hay harvest restriction  60 day grazing restriction – all livestock types  See supplemental label at: http://www.cdms.net/LDat/ld6CT014.pdf

43. 43 Prowl H 2 0 - BASF  PRE control of crabgrass, goosegrass, sandbur, Texas and fall panicum  Also controls some annual broadleaf weeds such as pigweed  Apply February to early March to dormant bermudagrass  Must be applied before annual grasses germinate (crabgrass begins germination at soil temps. of 50 to 55 F.)

44. Pastora – DuPont - 2010  Labeled in GA on Apr. 16, 2010  Sulfonylurea  Nicosulfuron 56.2% + Metsulfuron 15.0%  Pastora controls:  Sandbur, panicum sp., foxtails, barnyardgrass, signalgrass < 2.0 in. tall  Pensacola bahiagrass, before seedheads emerge in spring  Vaseygrass (after hay cutting)  Italian ryegrass < 6.0 in. tall  Johnsongrass – 6 to 10 in. tall  annual broadleaf weeds < 4.0 in. tall  Use rates: 1.0 to 1.5 oz./acre + NIS  Will be used on bermudagrass only (injures tall fescue and legumes)  No grazing or haying restrictions

45. Effect of Pastora Applied during Greenup on Southern Crabgrass Control. 2009. Pastora applied Apr. 15, 2009 – seedling crabgrass (Oz/ac)

46. Effect of Pastora Applied mid-July on Southern Crabgrass Control. 2009. Pastora applied July 20, 2009 – multi-tillered crabgrass (Oz/ac)

47. Conclusions - Pastora  Will control Italian ryegrass  Crabgrass not as sensitive as other annual grasses (best control of crabgrass is at seedling stage)  Established bermudagrass (one growing season)  Application Timings  Winter – dormant bermuda  Spring – before 2 inches of new growth  Summer – within 7 days of hay cutting

48. 48 Treat at this stage bull thistlemusk thistle Too late to spray Thistle Control

49. 49 Thistle  Late fall or early spring application  Treat at rosette leaf stage  2,4-D ester  WeedMaster  Grazon P+D  Chaparral  ForeFront  Milestone  Pastora Musk thistle

50. 50 Blackberry  1% Remedy or PastureGard for spray to wet.  2-3 pints per acre for broadcast.  Metsulfuron 0.5 oz per acre  Spray at full bloom.  Repeat applications needed for complete control.

51. 51 Blackberry Control TreatmentRate % Control 1 year later Grazon P+D + Remedy 1% + 0.25%73 PastureGard1%87 Remedy1%90 Milestone0.5%33 June 2005 to June 2006 Faulkner County, AR

52. 52 Blackberry control with Remedy, 1 qt/ac, Fall application, 6 MAT

53. 53 Blackberry control with Cimarron Plus 0.5 ozs/ac at bloom – 5 MAT

54. 54 Dewberry  0.625 oz Cimarron Plus per acre.  Spray at full bloom.

55. 55 Dewberry

56. 56 Greenbrier Control TreatmentRate% Control 1 yr later PastureGard2%27 Remedy2%70 Milestone0.5%0 J.W. Boyd, AR

57. 57 Dogfennel  Perennial – seed, roots  Treat at 18 to 24 inch growth stage  Best – PastureGard, Remedy, Grazon P+D, Weedmaster  Good – 2,4-D, 2.0 qts./acre  Poor to Fair – Metsulfuron

58. 58 Hemp Dogbane  Very tough to control.  Surmount at 3 to 6 pts per acre is the best.  Remedy provides temporary burn down. Milky juice

59. 59 Horsenettle

60. 60  Best – Grazon P+D at 3.0 pts./acre or ForeFront at 2.6 pts/ac  Fair – WeedMaster at 4.0 pt./acre or 2,4-D at 3 pts/ac  Add a nonionic surfactant at 0.25% v/v.  Apply at mid-bloom through fruiting Horsenettle

61. 61  Treat when small (2 to 4 inches) early May  Metsulfuron 0.25 to 0.33 oz/acre  Grazon P+D, Weedmaster, 2,4-D - 1-2 pts/acre, Cimarron Max 1 pt + 0.25 oz  Germinates all summer. Repeat applications needed. Pigweed Pigweed seed

62. 62 Spiny amaranth

63. 63  Identify weed  Select the right product  Time the application correctly  Apply accurately  Follow grazing and haying restrictions Keys to Herbicide Use

64. 64 Incorporate…  Mowing  Grazing  Fertilization  Herbicides ……in an integrated approach to weed management

65. 65 ????????