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| JMark71 summarized it well, it's just difficult to offer general herbicide recs, because different regions have different weed pressures, plus I have to be careful with herbicide recommendations, mainly because wheat growers in a 15-20" annual rainfall environment and a soil pH of 8.2 might use a recommendation I suggested for Kentucky, and the product (such as an SU herbicide) could persist in the soil and kill his sugar beet the following year. So be vigilant checking the herbicide labels closely for your area, rainfall, soil pH, and use the appropriate products and rates for your region.
Generally most SU herbicides such as Finesse and Harmony (both are ALS chemistry) have lost a lot of their activity on the common broadleaves in winter wheat, including chickweed and henbit (because of ALS resistance). Plus neither of these products offer any control of marestail, so we rarely use these products any more.
In a no-till system, Sharpen is an option to add to glyphosate for a burndown for ALS resistant marestail, but it's around $10 per acre at the 2.0 oz rate. Its residual is only around 6-8 weeks, and its residual control of chickweed and henbit isn't strong.
In a no-till or conventional tillage system, Quelex is a fall post emergence option which is currently good on most winter annual broadleaved weeds, including marestail, chickweed, henbit and bedstraw (cleavers) which is becoming more common in no-till systems. Be sure to follow the label regarding adjuvants.
Zidua SC/Anthem Flex (at the right rates for your soil types, and with the right adjuvants) offer good residual control of most broadleaved weeds, plus residual control of some of the grasses (including Italian ryegrass and bluegrass), but you have to get good coverage with the burndown herbicide in a no-till system, because these products do not have ANY significant activity on emerged weeds.
Metribuzin is a good and cheap herbicide. This product offers residual activity on a wide range of broadleaved weeds including chickweed and henbit, plus it helps on ryegrass control. Be aware injury to wheat can result when applied to small wheat, especially varieties more susceptible to metribuzin, and those grown on low CEC soils. | |
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Wheat question for Phil N
