Herbicides for Horehound Control

Disclaimer

These herbicide recommendations are made subject to the product being registered for that purpose under relevant legislation. It is the user's responsibility to check that registration or an off-label permit covers the proposed use. Always read the herbicide label.

If in doubt, visit the Australian Pesticides and Veterinary Medicines Authority (APVMA) website at www.apvma.gov.au.

Only herbicides registered for use in pasture and / or non-cropping situations are listed in the following table. For recommendations in specific crops consult an agronomist.

Care must be taken in using herbicides as non-target plants contacted may be harmed.

Wetting agents

Carefully consult the product label for specific directions regarding the use of wetting agents or adjuvants.

Waterways and wetlands

Be careful! Many herbicides can cause damage to waterways and wetlands. Check the herbicide label directions carefully before use near waterways and wetlands. For more information see Guidelines for Safe and Effective Herbicide Use Near Waterways.

Herbicide brands and concentrations

Herbicides are referred to by the active chemical ingredient in the following table. The product trade names in this publication are supplied on the understanding that no preference between equivalent products is intended and that the inclusion of a product does not imply endorsement by DPIPWE over any other equivalent product from another manufacturer. Information on available brands containing the herbicide you require should be obtained from a reputable herbicide supplier or the APVMA website at www.apvma.gov.au.

There may be a number of products with the same active ingredient but with alternate formulations (concentration) registered for control of a weed eg: Glyphosate 360 g/L, Glyphosate 450 g/L may be registered for use on the same weed. Alternate formulations such as these will have a different application rate. Always check the label.

Agricultural non-crop, commercial and / or industrial areas

Stage of weed growth	Herbicide (active ingredient & concentration)	Example of commercial product	Application rate of commercial product	Withholding period	Comments
Young, mature plants	Dicamba (500 g/L)	Kamba 500	Per ha 1.2 L/ha	7 days	Use a minimum of 1500 L/ha water carrier. Add Surfactant, (refer label).
			High vol. spray 80 ml/100 L water
			Knapsack 18 ml/15 L
	Triclopyr (600 g/L)	Garlon, Triclopyr 600	General rate 170 ml/100 L water		Apply as a thorough foliar spray. Do not allow spray drift onto susceptible crops. Affects clover. Slow acting, can take up to 3 months to show any effect.
	Bromacil (500 g/L) + Diuron (400g/L)	Kromac®*	Initial control 9 - 16.5 kg/ha		Industrial areas only: i.e., non-agricultural areas such as railways, pipelines, petroleum storage depots, timber yards, storage areas, industrial plant sites, fence lines, road sites, bridge abutments and power lines. Use lower rates in low or seasonal rainfall areas to control seedlings. For control of hard-to-kill, deep rooted perennials at least 100 mm of rainfall is usually required during growth period.
			Re-treatment 4.5 - 6.5 kg/ha		Apply when weeds reappear on sites where initial weed growth had previously been controlled.
Pre- flowering	Triclopyr (300 g/L), **Picloram (100 g/L)	Grass-up™, Conqueror®**	350 L per 100 L water		Apply as a thorough foliar spray.
	Triclopyr (300 g/L), **Picloram (100 g/L), Aminopyralid (8 g/L)	Grazon™ Extra**	350 ml per 100 L water		Apply as a thorough foliar spray.

Pasture containing legume

Stage of weed growth	Herbicide (active ingredient & concentration)	Example of commercial product	Application rate of commercial product	Withholding period	Comments
Up to 2 leaf stage	MCPA (250 g/L) + Diflufenican (25 g/L)	Nugrex, Tigrex®	1.0 L/Ha	7 days	Weed suppression in newly sown and established clover based pasture. Optimum results will be obtained if good soil moisture exists at and after application.
Seedling	2,4-D ester (600 g/L)	LV Estericide® 600	460-900 ml/Ha	7 days	Clover must be well covered by the grass or extensive damage may result. This product may only be used from 15 May to 15 September unless permitted by the Registrar of Chemical Products, DPIPWE.

Non-legume pasture

Stage of weed growth	Herbicide (active ingredient & concentration)	Example of commercial product	Application rate of commercial product	Withholding period	Comments
Seedling plants	Dicamba (500 g/L)	Kamba 500	Per ha 280-560 ml/ha	7 days	When applying by boom spray use 110 to 280 litres of mixture per hectare.
			High vol. spray 40 ml /100 L water
			knapsack 10 ml/15 L
Young, mature plants	Dicamba (500 g/L)	Kamba 500	Per ha 560ml -1.1 L/ha	7 days	When applying by boom spray use 110 to 280 litres of mixture per hectare.
			High vol. spray 76 ml /100 L water
			knapsack 18mL/15L
	2,4-D ester (600 g/L)	LV Estericide® 600	1.9 -3.7 L/ha	7 days	This product may only be used from 15 May to 15 September unless permitted by the Registrar of Chemical Products, DPIPWE.
	MCPA (340 g/L) + Dicamba (80 g/L)	Kamba M	Per ha 4-7 L/ha	7 days	Use higher rates on larger weeds. When necessary a second treatment may be made after 4 weeks.
			High vol. spray 470 ml/100 L water
			knapsack 100 ml/15 L
	Triclopyr (300 g/L), **Picloram (100 g/L)	Grass-up™, Conqueror®**	350 L per 100 L water	Nil	Apply as a thorough foliar spray.
Pre- flowering	Triclopyr (300 g/L), **Picloram (100 g/L), Aminopyralid (8 g/L)	Grazon™ Extra**	350 ml per 100 L water		Apply as a thorough foliar spray.

Non-cropping and bushland

Stage of Growth	Herbicide (active ingredient & concentration)	Example of commercial product	Application rate of commercial product	Withholding period	Comments
Actively growing to mature	*Glyphosate (360 g/L) where product has an aquatic registration	Weedmaster® Duo Roundup Biactive®	knapsack 10-13 ml per litre water		In accordance with APVMA Permit PER84775 Spot spraying / knapsack. Add surfactant/ wetting agent in accordance with product label.
	*Metsulfuron-methyl (600 g/Kg)	Associate® / Ken-Met 600/ Brush-off®	5 -10 g in 100 L water plus surfactant		In accordance with APVMA Permit PER84775 Spot spraying / knapsack. Add surfactant/ wetting agent in accordance with product label.
Weeds 6 - 8 weeks old	*MCPA (500 g/L)	MCPA 500 L	20 - 50 ml/10 L	7-10 days	In accordance with APVMA Permit PER84775 Spot spraying / knapsack/ wick wipe.

*These products are not registered for this application method in Tasmania and will not be mentioned on product labels, however Permit Number - PER84775 issued by the Australian Pesticides & Veterinary Medicines Authority has been issued for this specific use. If using this method and herbicide you will require a copy of this off-label permit.