Current Category » Weed Management
Commonly Used Herbicides Available in India
1) 2, 4-D ( 2,4-Dichloropnenoxy Acetic Acid):
It is selective translocated herbicide and most widely used to control dicot weeds (Broad Leaf Weeds) in cereals and sugarcane as post emergence application. It is cheap, easily available, easy to apply and non-poisonous to human beings and animals. It is available in three formulations as Sodium Salt (Fernoxone 80 wp or Agrosodium), Dimethylamine (Agrodor 96 or Weedar 96) and Ethylester (Knockweed 36 EC or Knock weed 4G). Sodium salt is white powder with characteristics odour , low volatile and is soluble in water. The dimethylamine is light brown liquid forms emulsion in water and is non-volatile. Ethylester is light yellow liquid may be low or high volatile and forms milky emulsion with water and it is obsorbed by weeds at faster rate than other forms so more effective for control of weeds. It is applied @ 1 to 1.5 kg a.e /ha in 500 to 600 litres as post emergence spray.
2) 2,4,5-T : ( 2,4, 5 – Trichlorophenoxy Acetic Acid ) and 2,4,5-TP ( 2,4,5-Trichloropropionic Acid):
Both the herbicides are similar to 2,4-D in properties and mode of action and useful for controlling bushes and woody weeds.
3) DICAMBA: ( 3,6 –Dichloro-2-Methoxybenzoic Acid):
It is selective translocated herbicides and available by trade name Banvel ( 50 EC). Useful to control broad leaf weeds and used @ 0.5 to 3 kg a.i/ha as postemergence spray.
4) SIMAZINE: (2,Chloro-4,6 –bi( Ethylamino ) s-triazine):
Atrazine ( 2-Chloro -4-( ethylamino -6- isoprophylamino-5-triazine. Both the herbicides are selective, translocated and as pre-emergence spray for killing broad leaf weeds and grasses in sugarcane, maize , jowar, potato, grapes etc. The selective rates are o.5 to 2.5 kg a.i /ha in 500 to 600 litres of water. Simazine is available in the market by trade name. Tafazine 50 W.P and Atrazine as Atrataf or Artex 50 wp. Atrazine is more soluble in water than simazine. Therefore , atrazine is more useful in dry farming areas.
5) Mertibuzine ( 4-Amino -6-tert-butyl- 3-(Methylthio) as triazine -5(4H)-one):
It is broad spectrum selective herbicides with both, soil and shoot activity and found useful in sugarcane , potato, tomato, soybean, etc. The effective rates are 0.2 to 1 kg a.i /ha. It is available in the market by trade name sencor as 70 WP.
6) Paraquat ( 1,1 –diethyl -4- bipyridinium Ion and Diquat ( 6,7 – dihydrodipyrido (1,2 :2 , I-C ) Pyrazinediiumaion):
Both the herbicides are contact, non-selective with zero persistence in the soil. Useful in sugarcane before germination and as direct spray after germiantion in sugarcane and orchards. Also useful as fallow application before sowing and also in noncropped areas. 1 to 2 kg a.i /ha as post emergence spray.
Paraquat is availability trade name gramoxone as 24 SL and diquat as reglone 20 EC.
7) Benthiocarb or Thiobencarb: ( S-(4-Chlorobenzyl) N,N – Diethyl – Thicarbamate) :
It is effective for control of Echinochloa spp. in rice. It is used as pre-emergence spray @ 1 to 2 kg a.i/ha. It is available in the market by trade name satrun 50 EC or Saturn 10 G or Bolero 10.
8) Alachlor ( 92-Chloro – 2,6- Diethyl- N-( Methoxymethyl ) Acetanilide) :
It is very annual grasses and certain broadleaf weeds in groundnut, soyean, cotton potatoes, maize , sugarcane and vegetables. It is applied @ 1 to 2 kg a.i /ha. It is available by trade name as 50 % EC. Or 10% granules.
9) Butachlor N ( Butoxymethy 2,6 –diethylacetanilide) :
It is selective pre-emergence herbicides used in seedbed and transplanted rice for control of Echinochloa spp. and most other annual weeds. The common rates are 1 to 2 kg a.i /ha. Upto 3 to 5 days after sowing in seeded rice and upto 10 days after transplanting in transplanted rice. It is available by trade name Machete as 50 EC or 5% granules.
10) Fluchloralin: ( N-(2-Chloroethyl)-2,6-dinitro-N-prophyl) – 4 ( trifluromethyl) amine):
It is selective pre-emergence herbicide effective against large number of annual weeds in cotton, soybean, jute , chickpea, sunflower, onion and certain solanaceous vegetables. Pre-planting soil incorporation of the herbicide give better results as it is volatile. It is applied @ 1 to 1.5 kg a.i /ha and available by trade name basalin as 45% EC.
11) Pendimethalin: ( N-(1-ethylprophyl)- 3, 4- dimethyl -2,6- dinitrobenzenamine) :
It is primarily selective pre plant, soil incorporated herbicide found effective against number of annual weeds particularly grasses in cotton, soybean, groundnut and pea. It is also used as pre-emrgence herbicide in maize , rice, small grains , onion and potato. The selective rates are 1 to 1.5 kg a.i /ha. It is available by trade name stomp 30 EC.
12) Glyphosate ( N-( Phosphomethyl ) (glycine) :
It is postemergence , non-selective, translocated herbicide. It is highly shoot mobile and weak residue herbicide and can be used against perennial weeds few days before sowing or as post emergence spray in non cropped areas. Very effective to control perennial weeds like nutgrass, hariali, etc. Recommended dose is 1 to3 kg a.i /ha as post emergence spray when weeds are in active stage of growth. It is available by trade name Roundup or Glycol 41 as 41 S.L. It is useful for killing perennial weeds effectively in fruit crops and sugarcane as directed spray.
Current Category » Weed Management