Weed management in wheat

1. INDIRA GANDHI KRISHI VISHWAVIDYALAYA RAIPUR
College of Agriculture, Raipur
Session- 2022-23
PRESENTED BY
Ramnath Potai
Ph.D. Scholar
Department of (Agronomy)
j
Chemical weed management in wheat

2. Chemical weed
management in wheat

3. • Critical period for crop-weed competition:
In dwarf wheat - 30-40 DAS
In tall wheat - 35-50 DAS
• Yield reduction up to - 20-40%
• Dwarf varieties of crops are more susceptible to weed crop
competition than the tall because initially they grow slowly

4. Narrow leaf weeds:
o Phalaris minor
o Avena fatua
o Lolium rigidium
o Polypogon monspeliensis
o Poa annua
Major Weed flora in Wheat

5. Phalaris minor
Avena fatua
Polypogon monspeliensis

6. Poa annua Lolium rigidium

7. Broad leaf weeds:
o Chenopodium album
o Melilotus alba
o Carthamus oxycantha
o Anagalis arvensis
o Circium arvense
o Convolvulus arvensis
o Argemone mexicana
Cont......

8. Chenopodium album
Melilotus alba
Circium arvense

9. Anagalis arvensis Carthamus oxycantha

10. Convolvulus arvensis Argemone mexicana

11. Chemical weed control
Herbicide Recommended a. i. kg/ha Time of
Application
1. Isoproturon 0.75-1.0 kg/ha Post- emergence
25-45 DAS
2. Diclofop- methyl 0.9-1.0 kg/ha Post- emergence
25-45 DAS
3. Tralkoxydim 20-30 g/ha Post- emergence
25- 30 DAS
4. Barban 1.0 kg/ha Post – emergence
30-35 DAS
(A) Annual grass weed control

12. Cont...
5. Pendimethalin 0.75-1.0 kg/ha Pre- emergence
6. Terbutryne 0.8-1.0 kg/ ha Pre- emergence
7. Chlortoluron 1.5-2.0 kg/ha pre- emergence
8. Difenzoquat 0.8-1.2 kg/ ha Post – emergence
9. Metribuzin 200 g /ha Post- emergence
10 .Flamprop- isopropyl 0.6 kg/ ha Post- emergence
Marwat et, al. 2013

13. B) Annual broad- leaved weed control
Herbicide Recommended a. i.
kg/ha
Time of
Application
1. 2,4-D 0.5-1.0 kg/ha Post- emergence
30-35 DAS
2. Metsulfuron- methyl 4-8 g/ha Post- emergence
20-35 DAS
3. Isoproturon 0.75-1.0 kg/ha Post- emergence
25-30 DAS
4. Barbazon 1.0-1.5 kg/ha Post – emergence
30-35 DAS

14. Cont...
5. Ready mix bromoxynil +
MCPA
1.4 + 1.2 kg/ha Post- emergence
6. Bromoxynil + ioxynil +
MCPA,
1.4 + 1.2 +2.0-2.5 kg /ha Post- emergence
7. MCPA
2,4-D
Mecoprop
0.4-0.5 kg/ha
0.5-0.75 kg/ha
0.5-0.6 kg/ha
post- emergence
8. Tribenuron- methyl and
sulfonyl urea
17-34 g/ ha and 60 kg/ha Post – emergence
9. Carfentrazone –ethyl 40-60 g/ ha Post- emergence
Das 2016

15. C) Broad spectrum weed control
Herbicide Recommended a. i.
kg/ha
Time of
Application
1. Tank- mix
isoproturon + 2,4-D
(Isoguard)
0.25 + 0.75 kg/ha Post- emergence
28-30 DAS
2. Metsulfuron-
methyl
4-8 g/ha Post- emergence
20-35 DAS
3. Isoproturon 0.75-1.0 kg/ha Post- emergence
25-30 DAS
4. Barbazon 1.0-1.5 kg/ha Post –
emergence
30-35 DAS

16. (D) Control of sedges
Bentazon @ 1.0-1.5 kg/ha as post-emergence 30-35 DAS control
Cyperus esculentus It should not be applied if rain is expected
within 8 hours.

17. • Clodinofop-propargyl @60-80 g/ha
or
sulfo sulfuron @ 20-40 g/ha
or
fenoxaprop-p-ethyl 100-120 g/ha
- Use as Post emergence at 28-35 DAS, they effectively
control Isoproturon-resistant Phalaris minor in North-
western wheat belt of country. (Rana et al., 2016)
(E) Alternate herbicides-for control of
Isoproturon resistance Phalaris minor

18. Herbicide Recommended a. i.
kg/ha
Time of
Application
1. Pendimethalin 0.75 kg/ha pre-emergence
2. Trakoxydim 30-40 g/ha post-emergence
3 .Chlorsufuron 20-30 g/ha Post- emergence
25-30 DAS

19. Several weeds infest the wheat fields, compete with
wheat for moisture, light and nutrients, and
decrease the wheat productivity
Herbicide is most potential single tool toward weed
management if used judiciously on the prescribed
guideline.
Herbicides particularly pre-emergence ones control
weed right from the beginning of their germination
and thus prove to be more efficient than many other
methods of weed controle.
Conclusion