Metribuzin 750
1 Trade nameManufacturerForm
4FARMERS METRIBUZIN 750 WG HERBICIDE4 FARMERS AUSTRALIA PTY LTDWATER DISPERSIBLE GRANULE
AC HACKSAW HERBICIDEAXICHEM PTY LTDWATER DISPERSIBLE GRANULE
Ag Protect Metribuzin 750 WG HerbicideAgprotect Australasia Pty LtdWATER DISPERSIBLE GRANULE
AGROCN METRIBUZIN 750 WG HERBICIDESHANGHAI AGROCHINA CHEMICAL CO. LTD.WATER DISPERSIBLE GRANULE
Agsure Metribuzin 750 HerbicideElders Rural Services Australia LimitedWATER DISPERSIBLE GRANULE
AGVANTAGE METRIBUZIN 750 WG HERBICIDELANDMARK OPERATIONS LIMITEDWATER DISPERSIBLE GRANULE
AKOBUZIN 75 WG HERBICIDEAAKO AUSTRALIA PTY LIMITEDWATER DISPERSIBLE GRANULE
APPARENT METRIBUZIN 750 WG HERBICIDEAPPARENT PTY. LTD.WATER DISPERSIBLE GRANULE
AW MINCER 750 HERBICIDEAGRI WEST PTY LIMITEDWATER DISPERSIBLE GRANULE
BUZZIN 750 WG HERBICIDEHEXTAR CHEMICALS PTY LTDWATER DISPERSIBLE GRANULE
CHEMFORCE METRIBUZIN 750WG HERBICIDECHEMFORCE 2010 PTY LTDWATER DISPERSIBLE GRANULE
CONQUEST AVALANCHE 750 WG HERBICIDECONQUEST CROP PROTECTION PTY LTDWATER DISPERSIBLE GRANULE
EmuAg Metribuzin 750WG HerbicideEmuAg Pty LtdWATER DISPERSIBLE GRANULE
EZYCROP METRIBUZIN 750 WG HERBICIDEEZYCROP PTY LTDWATER DISPERSIBLE GRANULE
FARMALINX METRALAN HERBICIDEFARMALINX PTY LTDWATER DISPERSIBLE GRANULE
FORWARD METRIBUZIN 750 WG HERBICIDEFORWARD AUSTRALIA PTY LTDWATER DISPERSIBLE GRANULE
Genfarm Metragen 750 WG HerbicideLANDMARK OPERATIONS LIMITEDWATER DISPERSIBLE GRANULE
GENFARM METRIBUZIN 750 WG HERBICIDELANDMARK OPERATIONS LIMITEDWATER DISPERSIBLE GRANULE
IMTRADE METRIBUZIN 750 WG HERBICIDEIMTRADE AUSTRALIA PTY LTDWATER DISPERSIBLE GRANULE
KENSO AGCARE METRIBUZIN 750 WG HERBICIDEKENSO CORPORATION (M) SDN. BHD.WATER DISPERSIBLE GRANULE
MACSPRED METRIBUZIN WG HERBICIDEMACSPRED PTY. LTD.WATER DISPERSIBLE GRANULE
MENTOR HERBICIDEADAMA AUSTRALIA PTY LIMITEDWATER DISPERSIBLE GRANULE
MENTOR WG HERBICIDEADAMA AUSTRALIA PTY LIMITEDWATER DISPERSIBLE GRANULE
Metrion 750WG HerbicideRURALCO HOLDINGS LIMITEDWATER DISPERSIBLE GRANULE
MISSION METRIBUZIN 750 WG HERBICIDEMISSION BELL HOLDINGS PTY LTDWATER DISPERSIBLE GRANULE
NOVAGUARD METRIBUZIN 750 WG HERBICIDENOVAGUARD PTY LTDWATER DISPERSIBLE GRANULE
OZCROP METRIBUZIN 750 WG HERBICIDEOZCROP PTY. LTD.WATER DISPERSIBLE GRANULE
RAINBOW METRIBUZIN 750 WG HERBICIDESHANDONG RAINBOW INTERNATIONAL CO., LTD.WATER DISPERSIBLE GRANULE
RALLIS METRIBUZIN 750 WG HERBICIDERALLIS INDIA LIMITEDWATER DISPERSIBLE GRANULE
Raystar Metribuzin 750 WG HerbicideRaystar Cropprotection Pty LtdWATER DISPERSIBLE GRANULE
RYGEL METRIBUZIN 750 WG HERBICIDEPROFENG AUSTRALIA PTY LTDWATER DISPERSIBLE GRANULE
Sabakem Metribuzin 750 WG HerbicideSABAKEM PTY LTDWATER DISPERSIBLE GRANULE
SMART METRIBUZIN 750 WG HERBICIDECROP SMART PTY LTDWATER DISPERSIBLE GRANULE
STACATO 750 WG HERBICIDESIPCAM PACIFIC AUSTRALIA PTY LTDWATER DISPERSIBLE GRANULE
TITAN METRIBUZIN 750 WG HERBICIDETITAN AG PTY LTDWATER DISPERSIBLE GRANULE
TOMAHAWK HERBICIDENUFARM AUSTRALIA LIMITEDWATER DISPERSIBLE GRANULE
UNIMARK 750 WG HERBICIDEUPL AUSTRALIA LIMITEDWATER DISPERSIBLE GRANULE
WELLFARM METRIBUZIN 750 WG HERBICIDEWELLFARM PTY LTDWATER DISPERSIBLE GRANULE
WHITESTAR METRIBUZIN WG HERBICIDEAGRICULTURAL PRODUCT SERVICES PTY LTDWATER DISPERSIBLE GRANULE

3 ACTIVE INGREDIENTS: Metribuzin 750g/kg as a dry flowable granule or wettable powder.

4 CHEMICAL GROUP: C.

27 ENVIRONMENTAL FATE:

Half life in soil: 45 days at 20 degrees and 50% WHC in Mohlin soil.
Half life in water: days at pH5 and 35 C.
It has an EPA classification for soil mobility that ranges from
It has a leaching index of 14. (for comparison, trifluralin is 0-1 and chlorsulfuron is 25-30).
Ground water contamination
Accumulation in milk and tissues.
pH stability:
Photolysis rate:
Hydrolysis half life:
Biodegradation rate:

Metribuzin is of moderate persistence in the soil environment. The half-life of Metribuzin varies according to soil type and climatic conditions. Soil half-lives of 30 to 120 days have been reported; a representative value may be approximately 60 days. Metribuzin is poorly bound to most soils and soluble in water, giving it a potential for leaching in many soil types. Soil mobility is affected by many site-specific variables, including the amount of soil organic matter, particle size distribution, porosity, rainfall, and application rates. Metribuzin has been detected in some rivers, wells and groundwater in the USA. The major mechanism by which Metribuzin is lost from soil is microbial degradation. Losses due to volatilization or photodegradation are not significant under field conditions. Breakdown in water: The half-life of Metribuzin in pond water is approximately 7 days. If present, Metribuzin would most likely be found in the water column rather than the sediment, due to its low binding affinity and high water solubility. Breakdown in vegetation: Metribuzin is absorbed through the leaves when plants are given surface treatment, but the primary route for uptake is through the root system. From the roots, it is translocated upward, becoming concentrated in the roots, stems, and leaves of treated plants. In non-susceptible plants it is de-aminised to more water-soluble conjugates; in susceptible plants it is not metabolized and disrupts photosynthesis in the chloroplast.

28 REGISTERED CROPS:

See HerbiGuide Species Solution tab.

29 REGISTERED WEEDS:

See HerbiGuide Species Solution tab.

30 REGULATION AND LEGAL:

UN number:
CAS numbers:
Hazchem code:
NOHSC classification:
Land transport:
Dangerous goods class:
Sea transport:
Proper shipping name:
Class:
Packaging group:
EPG:

31 PROPERTIES:

Empirical formula:
Water solubility: 1200 mg/L at 25 C at pH ;
Oil solubility:
Octanol:Water ratio: LogPow = at 25 C at pH 5;
Soil organic carbon absorption coefficient (Koc):
Vapour Pressure: at 25 C.
Dissociation constant: pKa
Melting point: C.
Boiling point: C.
Molecular weight:
Colour:
Odour:
Bulk density:
Specific gravity:
pH:
Flammability:
Shelf Life: years.
(When Stored under Ideal Conditions)

3. Formulation : Dry flowable, wettable powder.
4. Poison Schedule : 5
5. Trade name : Sencor 750 WG - Bayer
6. Product Colour : Brown-white.
7. Product Flammability : Non-flammable.
8. Dangerous Goods Class :
9. Shelf Life : Unlimited.
(When stored under ideal conditions- refer Page 4)
10. Mixtures Compatibility : Tank mixtures other than with trifluralin NOT recommended.
11. Registered Crop(s) : Barley, Peas (Field, Processing, Green), White Lupins, Potatoes, Soybeans, tomatoes and spot spraying.
12. Effect of Soil Texture on Herbicide : Heavier textures require higher rates of metribuzin to be used. In light sandy soils more metribuzin is available in the soil solution than in heavier clay soils: thus in light sandy soils it is more readily leached and more readily available for uptake. So use lower rates. Do NOT apply to light sandy soils low in organic matter as crop injury may occur. Metribuzin is readily leached from these soils.
13. Effect of Soil pH on Herbicide : More active at higher soil pH. Do NOT apply to soils of pH > 8 which are prone to waterlogging as crop injury may occur. Do NOT apply to barley in alkaline soils pH over 7. As pH increases, soil adsorption decreases.
14. Effect of Soil Organic Matter on Herbicide : Higher organic matter levels require higher rates of metribuzin to be used. For soybeans do NOT apply to soils with less than (<) 0.5% organic matter. as crop injury may result. As organic matter and clay content of soil increase the cation exchange capacity increases, as does the adsorption of metribuzin. Therefore movement through the soil profile decreases.
15. Mode of Action : Major method of uptake is via the root system, some contact and a little translocation. Both pre- and post-emergent.
16. Application Timing : Peas - apply after rain when crop is pre-em to 3 node stage. Lupins - pre-emergent. Barley - 5 leaf stage. Potatoes - no more than 6 leaves or no more than 10 cm high.
17. Rate Variations : 180 g/ha - 700 g/ha.
18. Rates Selection : Lower rate 180 g/ha light sandy soils i.e. Mallee sands. Higher rate 280 g/ha medium soils, loams, silt + clay 40 - 60%.
Other rates 380 g/ha heavy soils + clay loams + silt clay 60%. 470 g/ha Kooweerup swamp and volcanic soils. 700 g/ha in some situations where certain grasses are a problem.
19. Crop Damage (Crop Tolerance) :
Barley >5 leaf stage on moist soil.
Field Peas Sow crop 3-4 cm deep.
Lupins Tanjil, Wonga and old varieties of lupins are more sensitive to metribuzin than Gungurru and Merrit type varieties.
20. Effect on Crop : Do not apply to Pennant, White, Brunswick or Alma field peas.
22. Soil Moisture at Application :
DRY - There is no root uptake of metribuzin and results against grass weeds and hogweed (wireweed) will be poor.
MOIST - Best results if 6 - 12 mm rain falls within 2 weeks of application.
WATERLOGGED - Poor control as plants stressed, crop injury may occur if stressed.
23. Frost Effects : Prior to and after application there is a potential for crop injury or poor efficacy. During application wrong climatic conditions to apply the product.
24. Frost Free Days Required After Application : 1 day. Will depend on daily temperatures which will influence the rate of recovery.
25. Effect of Application Water Quality on Herbicide :
Saline Water - No adverse effect reported.
Soil Colloids - No adverse effect reported.
26. Recommended Water Volume : Minimum 120 L/ha.
27. Nozzle Type : Flat fan (Cone nozzles NOT satisfactory).
28. Recommended Nozzle Pressure : 200 - 300 kPa (28.6 - 43.5 psi).
30. Recommended Wetter : No wetter required.
31. Other Additives : None recommended.
32. Rain Fastness : 4 - 6 hours.
33. Time Interval Before Effect is Noticed : 7 - 30 days depending on growing conditions.
35. Effect of Herbicide/Disease Interaction on Crop : Do not apply to crops affected by collar or stem rot.
36. Withholding Period : 14 days for barley if grazed or cut for stock food.
37. Plant-Back Period : Do NOT plant treated areas to sensitive crops such as Brassica, sunflowers, or beetroot for at least 6 months following application of metribuzin, as crop injury may result. Thoroughly work the soil prior to planting of these crops.
38. Spray Tank Clean-Up : Flush tank, boom, hoses, and pump with several changes of fresh water after removing nozzle tips and screens (clean separately).
39. Other Comments : Do NOT apply on barley crops grown on alkaline, light sandy soils or soils low in organic matter. Do NOT use on pea crops grown on light sandy soils.
Numbered data from "Crop Herbicide Information"
Courtesy of A.J. Chambers, Vic. Dept of Food & Agric.

33 REFERENCES:

Acknowledgments:

Collated by HerbiGuide. For more information see www.herbiguide.com.au or phone 08 98444064.