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 Weed ID Pop Quiz Minimize
Location: BlogsWisconsin Crop ManagerWeeds    
Posted by: WCM Staff 5/31/2007 12:47 PM
Here are a few weeds that have been sent in for identification in the past couple weeks. Test your weed identification skills before looking at the answers below.

Weed ID Pop Quiz

Chris Boerboom, Extension Weed Scientist

Here are a few weeds that have been sent in for identification in the past couple weeks. Test your weed identification skills before looking at the answers below. Don’t cheat. If you know the weed, also try to answer the question.
 

Weed #1: Am I an annual, biennial or perennial?

 

Weed #2: Am I typically a weed of pasture, no-till, or tilled fields?

Weed #3: Am I an annual, biennial or perennial?

 

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Answers
Weed #1 – wild four o’clock is a perennial. Note the large taproot and opposite dark green leaves that are lilac shaped. Wild four o’clock can be controlled with plowing or with glyphosate applications in the bud stage. In non-Roundup Ready corn, dicamba can be used for suppression.
 
Weed #2 - purslane speedwell is a winter annual or annual that is found in no-till or even in some fields that are tilled late. It’s often only 6 or 8 inches tall. It is easy to identify after it flowers and produces the small swollen heart-shaped seed pods in the leaf axils. Other speedwell species are often found in lawns and also have similarly shaped seed pods.
 
Weed #3 – field horsetail is a perennial that is more frequent in no-till and moist soils. Field horsetail is often described as looking like a Christmas tree. It is easy to confuse the name with horseweed or marestail, the winter annual weed. Control options are limited. Tillage will suppress horsetail. In no-till, glyphosate and 2,4-D burndown treatments are not very effective. Peter Sikkema, a weed scientist at the University of Guelph in Ontario, reports good control with applications of flumetsulam (Python) in burndown applications.

 

 

 
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