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2 choices of treatment to
eradicate Canada Thistle ... #1. 1st Spring 1.5 qt per acre 2,4-D Amine Between June 1 and July 10th. ( the 1st application) 1st follow up Fall (Sept1) 1 qt. Amine and 1 pint Tordon 2nd follow up following Spring (June10th and later) 1.5 qts per acre Amine Check in the fall for any stragglers and then again use 1.5 qt Amine. ( I'll bet you don't find any) If there are no more patches in the area to reinfest, your problem will most likely be gone. No more thistles, no more time and expense. If for some reason you cannot spray in the spring, then replace the first spray option with mowing. Three weeks later or as soon as you have 4-6 inches of new lush growth, I use qt per acrea of Tordon if its in a location I can use tordon. First follow up fall to spot anything you might have missed. use 1.5 qt per acre Amine 2nd follow up the following spring.( July 1) If you see anything 1.5 qts per acre Amine. (I'll bet you don't see anything) Check your land every year for new seedlings and hit them with 1.5 qt per acrea Amine. #2. I started using a new chemical last year called Milestone. Is is a far better treatment than the above. In some cases one treatment cleans out even old infestations. At most only two treatments are needed. I had some work done late fall by ariel applicators and they put on 7 oz per acre. This spring there are few Candian thistles to be seen. I did a follow up around the edges of low spots that had water in them last fall. I used 5 oz early and then 6 as the season progressed. I also used 1 qt per 100 gal of water of surfactant. Note. Milestone has no effect on Mullien or Leafy Spurge, You need to go back with a different application for those two plants. Tordon for the Mullien. Flea beatles for the Spurge. Check with your county extension service for their circular and other recommended chemicals and rates. Always read and follow label requirements. |
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