Chloridazon

1 Trade nameManufacturerForm
BASF PYRAMIN SELECTIVE HERBICIDEBASF AUSTRALIA LTD.WETTABLE POWDER
PYRAMIN WG SELECTIVE HERBICIDEBASF AUSTRALIA LTD.WATER DISPERSIBLE GRANULE

3 ACTIVE INGREDIENTS: Chloridazon 650g/kg as a powder.

4 CHEMICAL GROUP: C. Herbicide. Pyridazinone.

5 RELATED HERBICIDES:

6 GENERAL DESCRIPTION:

A selective, residual, root absorbed, herbicide that control weeds as they germinate.

7 APPLICATION METHODS AND TIPS:

Apply on the day of sowing or soon after, before the crop and weeds emerge. It requires moist soil. If the soil is dry then irrigation or rain must follow within 10 days of application. Irrigation should not exceed 35 mm/week. It is often applied as a 10-20 cm band application and mechanical weed control used on the inter row areas.

10 WATER QUALITY:

Hard water

Colloids

pH

11 COMPATIBILITY:

Trace elements.

14 HERBICIDE RESISTANCE:

15 REPLANTING INTERVALS:

CropTime

Potatoes, onions, maize, sorghum, safflower and sunflower - less than 4 to 8 weeks.

Cucumbers, melons, tomatoes, snap beans, Lima beans, lettuce, cabbages, grapes, carrots, spinach - more than 4 to 8 weeks.

16 WITHHOLDING PERIODS:

CropTypeTime
AllHarvest 
AllGrazing 

17 RE-ENTRY PERIOD:

18 PROTECTIVE CLOTHING:

19 SOIL:

20 MODE OF ACTION:

Inhibits photosynthesis at phot system II.

Uptake and translocation:

Absorbed mainly through the roots.

Physiological effects:

Residual Life and Breakdown:

Selectivity:

23 PLANT SYMPTOMS:

Plants usually emerge then take up the herbicide and die.

SECONDARY EFFECTS:

24 TOXICITY:

Summary:

Details:

Mammalian toxicity -

Acute oral LD50 - mg/kg (rats), [For comparison table salt is 3000 mg/kg]

Acute dermal LD50 - > mg/kg (rabbit).

Skin -

Eye -

Vapour inhalation - LC50 - > mg/L air (rat).

Chronic oral toxicity NOEL - ppm for two years.

Not mutagenic or teratogenic (i.e. does not cause cancer or reproductive problems).

Other Species -

Birds - toxicity.

Fish - toxicity LC50 > ppm.

Invertebrates - toxicity.

Bees - toxicity.

25 TOXICITY SYMPTOMS:

26 FIRST AID:

27 ENVIRONMENTAL FATE:

It has a half life in soil of .

It has an EPA classification for soil mobility that ranges from

Ground water contamination

Replanting intervals

Accumulation in milk and tissues.

31 PROPERTIES:

Water solubility at 25 C. - ppm at pH ;

Oil solubility -

Octanol:Water ratio at 25 C. - at pH 5;

Vapour Pressure at 25 C. -

Dissociation constant - pKa

Melting point - C.

Molecular weight -

Half life in water - days at pH5 and 35 C.

33 REFERENCES:

Ashton, F.M. and Crafts, A.S. (1981) Mode of Action of Herbicides. (Wiley-Interscience publication).

Kearney, P.C. and Kaufman, D.D. (1976). Herbicides. Chemistry, degradation and mode of action. Vol 1 & 2.

Acknowledgments:

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