Prairie farmers growing field peas and dry beans will be able to use a retooled combo herbicide in 2013 against resistant annual grasses and broadleaf weeds.
BASF Canada on Monday announced it has picked up approval from Health Canada's Pest Management Regulatory Agency for Viper ADV, a solution combining its Group 2 active ingredient imazamox with bentazon, a Group 6 product.
The company had picked up registration in 2009 for a similar product -- simply branded Viper -- which had combined the two actives with ammonium sulphate (28 per cent UAN) for use only in field pea crops.
Viper ADV's new label notes its use in dry common bean crops was developed by "persons other than BASF Canada" and accepted for registration under the User Requested Minor Use label expansion program.
Dry common bean varieties -- especially white (navy) beans, which are more susceptible to herbicide injury -- "may vary in their tolerance to herbicides" including Viper ADV, the company noted on the product label.
Not all dry common bean varieties have been tested for tolerance to Viper ADV, the company added.
Viper ADV's new label also calls for application of the product at a litre per acre with two litres per hectare of a 28 per cent UAN and warns "a reduction in grass control can be observed without the addition of a nitrogen source."
The new Viper ADV's "multiple modes of action" offer "strong activity" against Group 1-resistant wild oats, Group 2-resistant wild mustard and Group 2-resistant broadleaf weeds, the company said.
As examples of the latter, BASF cited kochia and cleavers, both of which it said are becoming "increasingly problematic in field peas and dry beans in Western Canada."
Viper ADV "initiates weed control activity on contact and also provides systemic action after it is absorbed through the roots and leaves to move through the plant for maximum control," the company said.
Imazamox is one of the cornerstones of BASF's Clearfield cropping system, used alone or in combinations in Clearfield herbicide products such as Odyssey, Solo, Adrenalin and Absolute.
BASF also markets bentazon under the names Basagran and Basagran Forte as a liquid broadleaf weed killer, relying mainly on contact action. Viper ADV's label also notes the product can be "topped up" with Basagran Forte for control of additional weeds.
Viper ADV's label covers it for use only in the three Prairie provinces and northeastern British Columbia's Peace region.