Weed Management in Vegetables - PowerPoint PPT Presentation

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Weed Management in Vegetables

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Large crabgrass - Digitaria sanguinalis. London rocket - Sisymbrium irio ... Scarlet pimpernel - Anagallis arvensis. Shepherds purse - Capsella bursa-pastoris ... – PowerPoint PPT presentation

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Title: Weed Management in Vegetables


1
Weed Management in Vegetables
  • Why should we managed weed?
  • What problems do weeds cause?

2
Weed classification
  • Three general groups
  • 1- Grasses
  • Annual bluegrass - Poa annua
  • Barnyardgrass - Echinochloa Crusgalli
  • Bermudagrass - Cynodon dactylon
  • Johnsongrass - Sorghum halapense

3
Sedges
  • Yellow Nutsedge Cyperus esculentus

4
Broadleaf weeds
  • Alkali mallowSida hederacea
  • Annual sowthistleSonchus oleracus
  • Black mustardBrassica nigra
  • Burning nettleUrtica urens
  • ChickweedStellaria media
  • Common groundselSenecio vulgaris
  • Common knotweedPolygonum aviculare
  • Common purslanePortulaca oleracea
  • Curly dock Rumex crispus

5
  • FilareeErodium sp.
  • Large crabgrass - Digitaria sanguinalis
  • London rocket - Sisymbrium irio
  • Lambsquarter - Chenopodium album
  • Malva - Malva spp.
  • Black nightshade - Solanum nigrum
  • Pigweed - Amaranthus retroflexus
  • Prickly lettuce - Lactuca serriola
  • Puncture vine - Tribulus terrestris
  • Scarlet pimpernel - Anagallis arvensis
  • Shepherds purse - Capsella bursa-pastoris
  • Wild radish - Raphanus sativus
  • Yellow mustard - Brassica campestris

6
Weed and life cycles
  • Table 7.2 on page 131.

7
Control Methods
  • Mechanical
  • Management Practices
  • Chemical

8
Mechanical Control
  • Pre Planting
  • Plowing
  • Rotaty Hoeing
  • Post Planting
  • Cultivating
  • Hand
  • Machine
  • What to consider when Cultivating
  • depth

9
Cultivating its Effects
  • Aeration
  • Moisture conservation
  • Increased organic matter
  • Compaction less or more?
  • Temperature less or more?

10
Cultivation Implements Tools
  • Tractor size
  • Types of sweeps
  • Spiders ?

11
Management Practices
  • Crop Rotation
  • Mulching
  • Organic
  • Synthetic
  • Biological Controls
  • Post Harvest care of the field

12
Chemical Control
  • Herbicides
  • When did they really take off in agriculture?
  • Preplant applied before crop is planted and
    incorporated into the soil..
  • Preemergent applied to soil surface after crop
    is planted.
  • Post emergent applied after emergence of the
    crop.

13
Methods of Application
  • Broadcast treatment - (solid area in liquid or
    granular form)
  • Foliar treatment Spray directly on leaves.
  • Band treatment Narrow stripe are treated.

14
Are Herbicides Cost Effective?
  • One must consider the following factors when
    determining the cost effectiveness of herbicides
  • Rate timeliness of application
  • Soil type
  • Cultural practices
  • Weather conditions
  • Type of crop
  • Weed species
  • Cost of matterial
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