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Veteran Advisor

Harvest Weed Management Control

This very sobering report by ISU Bob Hartzler refers extensively to Australian experience in herbicide ineffectiveness to discuss what we have to look forward to in the US.


More weeds going to seed mean more for pre and post herbicides to address, and they are being smothered.  We need to attack the seed bank.


The Australians have some machinery like chaff mills and other methods like fire to address that.  Some may work here.  They are all expensive or have other risks.

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BA Deere
Honored Advisor

Re: Harvest Weed Management Control

I saw Bob today, he was saying all the modes of action that some rye weed is resistant to in Australia. He said when waterhemp gets resistant to group 4 and 15, its all over as far as chemical control so like you say, we have to control the "weed bank".  FMC is rumored to have discovered a new mode of action, but he`s seen that before, there`s a lot of regulatory hoops to jump through before it gets to market at an affordable price.


But those chaff/seed collectors for combines, they require an extra 100hp on the combine and don`t work well in humid weather.   But as a kid, we used to combine with the old model 30 pull type John Deere combine, 2 rows 38" and they had a attachment back of the 20 bushel grain tank where you could attach a feed sack and collect weed seed. It wasn`t complicated, back then it would be filled with mostly foxtail seed, sometimes in the peat, giant iron weed (Giant ragweed) seed.  If the beans were relatively clean maybe a 50lb bag of weed seed per acre or so.

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