[AT] Round-Up resistant weeds

[Ralph Goff]

Its true there are always going to be a few resistant plants out there. 
Continued use of the same herbicide means those few resistant seeds can 
multiply and soon become a problem. Its the reason why we are encouraged to 
rotate our crops and herbicides. Without going into a description of the 
various herbicide groups I can say that the different herbicides have 
different modes of action so even if a weed is resistant to one group of 
herbicides it will not be resistant to all.
We grow a lot of roundup ready canola here. That combined with the necessary 
burn off with glyphosate on zero till fields means that even one roundup 
resistant weed on a field has an opportunity to multiply.
As long as I grow a different crop on that field next year and use a 
herbicide from another group it will not be a problem.
Actually roundup ready canola is already considered a weed by some. When I 
chem fallow a field I can't depend on just roundup obviously as it will kill 
everything except the volounteer RR canola. So I have to mix a little 2-4D 
or equivalent to get a weed kill. Its part of the price we pay for the 
convenience of roundup ready canola crops.

Ralph in Sask.
----- Original Message ----- 
From: "David Bruce" <davidbruce at yadtel.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Wednesday, May 05, 2010 2:02 PM
Subject: Re: [AT] Round-Up resistant weeds


> In this area where there is still a bit of corn and soybeans grown the
> Round Up resistant weeds are becoming more prevalent.  Some of these
> were always Round Up resistant and with the aid of Round Up and no till
> farming they show up more.  Most of the grain farmers here have moved to
> tillage at least every third year and usually with fall and spring
> mowing to reduce the number of seed produced.
>
> David
> NW NC
>
> On 5/5/2010 3:18 PM, dglass wrote:
>> Do you think its possible that the weeds have become resistant to
>> roundup because the patents ran out last year and now they had to lower
>> the price to compete with generics?  Just a though.
>>
>>
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