Cultural,
Mechanical, & Biological Management
These
methods of control are similar to those for diffuse and Russian knapweed.
Herbicide
Control
Some
herbicides are labeled for control of spotted knapweed. Those that
can be used independently or in combination with each other are:
Picloram (Tordon), clopyralid (Stinger), dicamba (Banvel), 2,4-D,
and a premix of clopyralid and 2,4-D (Curtail). Picloram has been
found to be most effective. 2,4-D,when used alone, results in poor
control.
Herbicide |
Rate (per acre) |
Application
Time |
Remarks |
Tordon
22K |
1
pt. |
Apply
in spring prior to stem elongation and/or to rosettes in the fall. |
n/a |
Banvel
+
2,4-D
Amine |
1
pt. +
1
pt. |
Apply
in spring prior to stem elongation and/or to rosettes in the fall. |
n/a |
Curtail |
2
qts. |
Apply
in spring after majority of basal leaves emerged to pre-bud stage. |
Apply
in enough total spray volume to ensure good coverage. |
Read
the label to insure the herbicide is labeled for your application
site.
