Posted by paul on August 25, 2009 at 18:00:14 from (66.44.132.218):
In Reply to: Thistles posted by adrian on August 25, 2009 at 13:39:50:
Canadian thistles? They are bad news for peas, buds mature about the time as peas do & reject the field for the contamination.....
Roundup will kill them, but takes 2 applications, and you want lots of sticky in it - add extra stuff that makes the chemical stick to the plant. Don't go thin, you want a lot of RU.
Won't look like it is doing much, thistles will just sit there. The chemical has to travel down through all that root mass, and starts killing the plant from the bottom up. Might not look like it did anything for 2 weeks, but - they will get crispy. Do not till them or work the ground, let the chemical work!
24D or dicomba (Banvel, etc.) will hurt thistles, but they have a hard time killing them - just wound them for a season.
Stinger, Tordon, & other specialty sprays will go after thistle & not hurt grasses, but these are spendy, you are much better off with a good dose of glyphosate (Roundup) for what you are doing.
Thistles are hard to kill in spring when the sap is running up from the root mass. They are one of the few plants that are easier to kill in fall after blooming, when the sap is now running back down to replentish the root mass.
There isn't anything that will clear a field of thistles in one application, those big deep root masses are tough, you will need to repeat when you see more growing. Don't know if you have time to spray in spring before the peas, they tend to go it very early?
More RU this first time will help, go over the patches 2x, look at the lable you can use up to 3 quarts per acre, commonly we use 1 quart for general use. Don't be cheap on those patches, and use an extra sticky, even if they say it's not needed.
It is _so_ nice once those patches are gone, much easier to control the new small growth of thistle once those big old patches are gone. Do it right this time, and life will be more fun.
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