Metribuzin 750

Metribuzin 750

1 Trade name	Manufacturer	Form
4FARMERS METRIBUZIN 750 WETTABLE POWDER HERBICIDE	4 FARMERS PTY LTD	WP
ALLFIRE METRIBUZIN 750 HERBICIDE	AGVANTAGE PTY LTD	DF
CAMPBELL DORADO 700WG HERBICIDE	COLIN CAMPBELL (CHEMICALS) PTY LTD	WG
CHEMAG METRIBUZIN 750 WETTABLE POWDER HERBICIDE	IMTRADE AUSTRALIA PTY LTD	WP
CHEMAG METRIBUZIN 750 WG HERBICIDE	IMTRADE AUSTRALIA PTY LTD	DF
CHEMFORCE METRIBUZIN 750WG HERBICIDE	FRANK VANDERKLEY & PAUL RICHARDS T/A CHEMFORCE AUSTRALIA	WG
CONQUEST AVALANCHE 750 WG HERBICIDE	CONQUEST AGROCHEMICALS PTY LTD	WG
DUPONT LEXONE XTRUDED HERBICIDE	DU PONT (AUSTRALIA) LTD	DF
FARMOZ MENTOR WG HERBICIDE	FARMOZ PTY LIMITED	WG
FARMOZ METRIBUZIN 750 WP HERBICIDE	FARMOZ PTY LIMITED	WP
GENFARM METRIBUZIN 750 WG HERBICIDE	GENFARM CROP PROTECTION PTY LTD	WG
KENSO AGCARE METRIBUZIN 750 WG HERBICIDE	KENSO CORPORATION (M) SDN BHD	DF
RALLIS METRIBUZIN 750 WG HERBICIDE	RALLIS INDIA LIMITED	WG
SENCOR 750 WG HERBICIDE	BAYER CROPSCIENCE PTY LTD	WG
SMART METRIBUZIN 750 WG HERBICIDE	CROP SMART PTY LTD	WG
STACATO 750 WG HERBICIDE	SIPCAM PACIFIC AUSTRALIA PTY LTD	WG
SUMMIT METRIBUZIN 750 WG HERBICIDE	SIPCAM PACIFIC AUSTRALIA PTY LTD	WG
TOMAHAWK HERBICIDE	NUFARM AUSTRALIA LIMITED	WG
UNI-MARK 750 WG HERBICIDE	UNITED PHOSPHORUS LTD	WG
UNITED FARMERS METRIBUZIN 750 WG HERBICIDE	UNITED FARMERS CO-OPERATIVE COMPANY LTD	WG
WHITESTAR METRIBUZIN WG HERBICIDE	AGRICULTURAL PRODUCT SERVICES PTY LTD	WG

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:

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 Lexone DF 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.