Spring-applied herbicides are no match for henbit, a winter annual weed found in more than 50 crops – including corn, cotton and soybean. But researchers say a simple change in application timing can make all the difference.

A three-year study conducted by Louisiana State University showed that fall-applied herbicides can deliver great control of henbit in the spring – reducing its ability to compete with newly planted crops.  The key is to apply the chemicals during the weed’s peak emergence period of late October through early December.

Henbit (Lamium amplexicaule L.) is a very common and troublesome winter annual weed of crops. Historically, crops producers have focused their spring-applied herbicide applications for henbit management.

Researchers found that fall applications of paraquat plus flumioxazin, oxyfluorfen or rimsulfuron:thifensulfuron provided greater than 90% control of henbit in March. Paraquat plus S-metolachlor provided similar springtime control.

To find out more, read the article Determining Seasonal Emergence and Control Programs for Henbit (Lamium amplexicaule L.), which is available in Weed Technology Vol. 32, Issue 6.

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