Thistles

Download weedsheet

Download weedsheet

Thistles (Scotch and Nodding) control

Access all the information needed for control of this noxious weed, including weed identification, herbicide application and spray timings.

Weed Description

Description

Thistles are erect flowering plants that typically stand around 2 m in height, with spiny leaves and stems. Early identification during the rosette stage of growth would ensure easer control options.

SCOTCH THISTLE
The flowers are made up of many small flower heads and are purple in colour. The stem and leaves on the plant are a whitish grey due to a fairly dense covering of short hairs.

SPEAR THISTLE
The flowers are purple in colour and made up of many little florets (tiny flowers), with spines on the stem and leaves. The stem leaves can grow up to 25 cm long and have a cobwebby texture.

SAFFRON THISTLE
The flowers can range from yellow to orange-yellow, and are surrounded by thin spiny offshoots that can grow up to 5 cm long. The leaves themselves are usually hairless, but can occasionally grow with hairs and the stems are hairless.

Weed Control

Controlling Thistles

Isolated plants or small patches can be removed using tools such as a hoe or mattock. Vigilant II can also be used by applying it to at least 50% of the leaves of the plant.

When treating in grass pastures, ensure the pasture is slightly grazed and then after 7 days treat with Lontrel Advanced + MCPA amine by boom application.

For more extensive thistle infestations, it is recommended to use Grazon Extra at 1.4mL/1K of water as a foliar spray with a knapsack or 12 volt sprayer.

Herbicides for control of Thistles

Product#
Method of application Rate* State
Lontrel™ Advanced Boom application 25 or 35 mL/ha + 1 or 1.5 L/ha MCPA amine (500g/L) NSW, Old, SA, Tas, Vic
Hotshot™ Foliar spray 500 mL/ 100 L of water All
Lontrel™ Advanced Foliar spray 125 mL/ 100 L of water NSW, Old, SA, Tas, Vic
Grazon™ Extra Herbicide Foliar spray 150 mL/100 L of water All
Statesman™ 720 Herbicide Foliar spray 280 mL/ 100 L of water NT, Old
Vigilant™ II Herbicide Leafwiping Neat 50% leaf area All

# Note: Preferred product option in bold. * Consult label for details of growth stage and use, especially where range of rates is given.

Treatment Timing

Timing

When treating in grass pastures, it is optimal to treat udirng early winter or spring.

PRODUCT Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug
Grazon Extra
Hotshot
Lontrel Advanced
Vigilant II
KEY
Best time to spray/treat
Can spray/treat
if conditions are suitable
Do not spray/treat