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Weed Management :: Problem and Parasitic Weed Management

Management of Problem, Perennial And Parasitic Weeds

Cynodon dactylon (Arugu) & Cyperus rotundus (Koarai)

Management of perennial weeds like Cynodon dactylon & Cyperus rotundus by the application of Glyphosate 10 ml + AGF activator 2 ml / lit of water (or) Glyphosate 15 ml + 20 g Ammonium sulphate / lit of water.




Post emergence, total, translocative herbicide


Stage of weed 


Active growing, pre flowering stage




Hand operated Knapsack / Backpack




WFN 24 & ULV 50 with 30 Psi


Spray volume   


250-300 litre / ha

Cynodon dactylon

Application technology

Non-Crop situation     - Blanket application
Cropped situation       - Pre-sowing / planting - Stale seed bed (Blanket application)
Established Crops       - Directed application using hoods.

Note: Rain free period / waiting period: 48 hours

Parthenium hysterophorus (Parthenium natchu chedi)

  • Manual removal and destruction of Parthenium plants before flowering using hand glouse / machineries (or)
  • Pre-emergence application of atrazine 4 g / litre in 500 litres of water / hectare (or)
  • Uniform spraying of sodium chloride 200g + 2 ml soap oil / litre of water (or)
  • Spraying of 2,4-D sodium salt 8 g or glyphosate 10 ml + 20g ammonium sulphate + 2 ml soap solution / litre of water before flowering (or)
  • Post-emergence application of metribuzin 3 g / litre of water under non crop situation.
  • Raising competitive plants like Cassia serecea and Abutilon indicum on fallow lands to replace Parthenium (or)
  • Biological control by Mexican beetle, fungal pathogen and nematodes

Note : Parthenium can be decomposed well before flowering and used as organic manure.

Parthenium hysterophorus

Solanum elaegnifolium
(Kattu Kandan kathiri)

Post-emergence application of Glyphosate 20 ml alone or 10 ml in combination with 2, 4-D sodium salt 6 g / litre.

Note: The application should be during the active growth / vegetative phase of weed.




Ipomoea carnea
(Neyveli kattamanakku)

  • Foliar application of 2,4-D sodium salt 8 g + urea 20g + soap oil 2 ml / litre of water and then removal and burning of dried weeds (or)
  • Manual / mechanical removal of grownup plants in channels during summer (or)

Note : Composted Ipomoea carnea plants can be used as organic manure  preferably in rice fields.

Eichhornia crassipes (Agaya thamarai)

  • Manual  / Mechanical removal and drying
  • Application of 2,4-D sodium salt at 8g + urea at 20g or Paraquat at 6 ml / litre of water

Note : Vermi-composting and composting of dried water hyacinth and can be used as organic manure in irrigated upland ecosystems.

  Portulaca quadrifida (Shiru pasari)
  • Post-emergence tank mix directed application of glyphosate 10 ml/l + 2, 4-D sodium salt 5g / lit to control Portulaca quadrifida in cropped fields.

Note: Not to use above herbicides in broadleaved crops particularly cotton and bhendi.

Striga asiatica (Sudu malli)

Pre-emergence application of atrazine 1.0 kg/ha on 3rd DAP + hand weeding on 45 DAP with an earthing up on 60 DAP combined with post-emergence spraying of 2,4-D at 6 g (0.6%) + urea 20 g (2%) / litre of water on 90 DAP + trash mulching 5 t/ha on 120 DAP.

  Orabanche (Pukaielai kalan)

Plant hole application of neem cake 25 g / plant or drenching of copper sulphate 5% provides partial control of Orabanche in tobacco.

Image Source:
-- Dr.R.Jagannathan,
   Professor of Agronomy,
  TNAU, Coimbatore-3.

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