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A few suggestions on weed control in your garden

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  1. 1. Weeds!!!Bart RennerNorth Carolina CooperativeExtension serviceMay 6th, 2013
  2. 2. What is a weed?• Plant growing in the wrong place• Generally very aggressive/ reproduces quickly• Responds well to disturbance
  3. 3. Why are weeds a problem?• Rob our desired crops of nutrients, sunlight, water.• Create home for undesirableinsects, fungus, snakes, rats, pests etc.• Make harvest difficult
  4. 4. Weeds?http://farm4.staticflickr.com/3193/2464758679_7b99c6e2a2_z.jpg?zz=1
  5. 5. Weed?http://i276.photobucket.com/albums/kk17/kkozmins/volunteercornAug6-1.jpg
  6. 6. http://4.bp.blogspot.com/_b_MC5rbeRUc/TBqz2ESnPjI/AAAAAAAABe4/iqMyV943jeY/s1600/100_6085.JPGAn IPM approach to weed managementWeedinformationHerbicidesHand pullingTillage Cover cropsCroprotationWeedfreeperiods
  7. 7. Hand pulling weeds• Best for in between plants• Understand when your weeds are beginning toharm your crops• Best done in the morning
  8. 8. TillagePositive• It is a mechanical way to destroy weeds.• Ploughing loosens and aerates the top layer of soilwhich can facilitate the planting of the crop.• It helps in the mixing of residue from theharvest, organic matter (humus) and nutrientsevenly throughout the soil.• Dries the soil before seeding.
  9. 9. TillageNegative• Brings up weed seed buried in soil• Soil dries faster• Erosion of soil / Higher rate of fertilizer andchemical runoff.• Reduces organic matter in the soil(Microbes, carboncompounds, earthworms, ants, etc.).• Destroys soil aggregates.• Aeration and mineralization may causelower soil fertility.http://en.wikipedia.org/wiki/Tillage
  10. 10. Cover cropshttp://www.waldeneffect.org/20110824covercrops.jpg
  11. 11. Rye• Important to understand the difference betweenryegrass and cereal rye.• Generally most cold tolerant cover crop.• Produce allelopathic chemicals• Can mine nutrients from deep in the soil
  12. 12. Cereal ryehttp://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Ear_of_rye.jpg/800px-
  13. 13. Ryegrasshttp://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Starr_001026-9002_Lolium_perenne.jpg/754px-Starr_001026-9002_Lolium_perenne.jpgCool season grassDeep rootsAllelopathic
  14. 14. Vetchhttp://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Vicia_orobus1_eF.jpg/417px-Vicia_orobus1_eF.jpg•Great nitrogen fixer•Very effective at outcompeting weeds(once established).•Good for the bees!
  15. 15. Cereal Rye and vetchhttp://www.uvm.edu/vtvegandberry/factsheets/vetch%20and%20rye.JPG
  16. 16. Clover• Cold tolerant, can beplanted in the fall orspring• N fixing• Great for the bees!• Needs a higher pH (6.5-7)http://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Trifolium_pratense_0522.jpg/220px-Trifolium_pratense_0522.jpg
  17. 17. Cloverhttp://www.extension.org/sites/default/files/w/1/17/Crimson_clover_cover_crop_small.jpg
  18. 18. Buckwheat• Rapid growth in thesummer• Great for a smothercrop in betweenspring and fallplantings• Rapid growth cycle
  19. 19. Brassicas• Produce plenty ofbiomass• Have shown goodpest andnematode control• Good for thebees!• Deep rootedhttp://www.extension.org/pages/18643/brassicas-and-mustards-for-cover-cropping-in-organic-farming
  20. 20. Synthetic Groundcovers• Can be permeableor impermeable• biodegradablehttp://www.johnnyseeds.com/images/Product/large/9302.jpg
  21. 21. http://2.bp.blogspot.com/_FQwY2pRG6O8/ShiGsswp8DI/AAAAAAAAAHg/71iqXYbP_Ng/s400/Tomatoes+mulched.JPG
  22. 22. http://2.bp.blogspot.com/-f-IaFYVlbPM/TZL5vv5waeI/AAAAAAAAANY/Mz7uJ1PcIq8/s1600/100_5303.JPG
  23. 23. Timing of weedinghttp://www.omafra.gov.on.ca/english/crops/facts/09-045wf1.jpg
  24. 24. http://www.nzdl.org/gsdl/collect/fnl2.2/archives/HASHd3b4.dir/p090.gif
  25. 25. Chemicals• Round up-Glyphsate• Crossbow-Tychlopyr, 2,4-D• Dicamba-broadleaf weeds• Many more
  26. 26. Questions?http://3.bp.blogspot.com/-ranMxTMXrw0/TzG_0CbfpqI/AAAAAAAAAjc/vT_-khhblHo/s1600/weeding.jpg