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 Collecting Lambsquarters Seed for Testing Plant Response to Glyphosate Minimize
Location: BlogsWisconsin Crop ManagerWeeds    
Posted by: WCM Staff 9/19/2007 1:56 PM
We’re interested in continuing our testing of common lambsquarters populations that have escaped control with glyphosate. If there is no readily apparent reason for the lambsquarters to escape control, these lambsquarters may have a low level of resistance to glyphosate. We want to test seedlings from these plants this winter in our continuing effort to better understand potential changes in lambsquarters sensitivity to glyphosate.

Collecting Lambsquarters Seed for Testing Plant Response to Glyphosate

 

Dave Stoltenberg and Chris Boerboom, Department of Agronomy

 
In the June 7 issue of the Crop Manager, we reported that among 40 populations of common lambsquarters that we’ve tested in the greenhouse, six populations appear to be relatively less sensitive to glyphosate. 
You can access the article (in issue Vol. 14 No. 14) at http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/294/Default.aspx. We’re interested in continuing our testing of common lambsquarters populations that have escaped control with glyphosate. If there is no readily apparent reason for the lambsquarters to escape control, these lambsquarters may have a low level of resistance to glyphosate. We want to test seedlings from these plants this winter in our continuing effort to better understand potential changes in lambsquarters sensitivity to glyphosate.
 
If you have a field with lambsquarters escapes, please consider if these lambsquarters are a good candidate for testing. Review another previous article at http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/85/Default.aspx for points to consider when trying to determine if the escapes might be from application or environmental issues or resistance. If the lambsquarters does not have any logical reason for escaping, we would like a seed sample for testing. Unfortunately, gathering a lambsquarters seed sample is not as easy as grabbing and shelling an ear of corn. Also, getting enough lambsquarters to germinate is also not easy, so we need a fair amount of seed to plant for testing. We recommend these guidelines for collecting and submitting lambsquarters seed.
 
Needed: 1/4 cup of mature seed (black or brown)
 
Suggested collection method
1. Wait until black seeds develop in the seedheads.
2. Clip the seedheads of many plants and place in a couple of grocery bags, leave bags open.
3. Leave bags in the shed or garage for a week to air dry.
4. Rub the dry seedheads to knock out the seed.
5. Collect the seed in an envelope or small paper bag. Don’t worry about chaff mixed with the seed. If there is a lot of chaff, try to collect about 1/2 cup of seed and chaff.
6. Mail the seed to Dave Stoltenberg at the address below. 
7. Please include this site information.
 
 
Information:
 
Field: (check one)   corn ____     soybean ____
 
Glyphosate rate(s): __________________
 
Field location
 
Township: _______________________
 
County: _________________________
 
Contact information
 
Name: _____________________________
 
Phone or email: _____________________
 
Mail to:
Dave Stoltenberg
Department of Agronomy
1575 Linden Drive
Madison, WI 53706
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