Corvus: While residual prevents, reactivation gets late weeds


Every growing season seems to be a guessing game when it comes to the weather, but it doesn’t have to be with weeds, says two Bayer Crop Science experts.

“You never know when you are going to get rainfall, you never know how much herbicidal activity you are going to get,” said Mark Waddington, Product Development Manager, Bayer. “With Corvus herbicide, a proven herbicide that’s been out on the market for 10 years, you really get that consistent performance and that good broad spectrum activity from both reactivation and residual.”

We had the opportunity to visit with Waddington and Josh VanDeWalle, Northern Region Campaign Manager, Bayer at the 2017 Farm Progress Show about the pre-emergence corn herbicide and what the difference is between residual activity and reactivation.

“For many years, growers, producers, farmers know what residual activity is. It’s preventing weeds from emerging. It’s herbidical activity prior to weed germination or emergence,” Waddington said. “Where Corvus is different or stands out in the market is the reactivation capabilities.”

According to Waddington, the active ingredient in Corvus actually reactivates after a dry period. While residual activity initially occurs after a rainfall where you get weed germination and emergence and herbicide movement into the plant for weed death and prevention from emergence and germination, Corvus has the power to reactivate.

“What typically happens then is a dry spell occurs, there is enough moisture in the soil for weed germination and weed emergence, but not enough soil moisture for herbicidal activity so the weed will emerge and either get very small or just be emerging coming out of the ground,” Waddington said. “Eventually another rainfall event will come and Corvus herbicide will reactivate and take that emerging weed down, where other herbicides on the market will not.”

With weeds creeping into many growers’ fields this growing season, VanDeWalle said weed control was a hot topic at the Bayer booth during Farm Progress.

“Farmers are really looking for new ways to control some of these weeds that are really tough to control. Like waterhemp and Palmer that we know are weeds that are really difficult to control, unlike some of the other annuals that we deal with, they are germinating all season long,” VanDeWalle said. “So having the ability to have something that has a residual down and the ability to reactivate when you get as little as a half inch of rain in order to reactivate and take down those small weeds is really a unique benefit of Corvus.”

VanDeWalle said another perk to the product is it works no matter what sort of soil type you have.

“It’s really important to have that consistency, even with changing weather conditions or changing soil types, and to have that ability to mitigate the weed resistance challenges we deal with today,” VanDeWalle said.

Waddington said now is the time to take a look and decide what your weed control program is going to be for next season and Corvus would be very complimentary.

“Providing a good solid foundation, a good solid residual, is paramount into getting the crop off to a good start and Corvus with the consistency, with the residual, with the reactivation, is a real good choice for your weed control program,” Waddington said.

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