A GUIDE TO SPRING WEED CONTROL
Few ‘on label’ options for grass weed control in spring cereals Crop protection business Adama says that its herbicide Tower is one of the few options for control of grass and broad-leaved weeds in spring cereals. Dominic Kilburn writes. Resistance to ALS herbicides is a major issue, particularly so in poppy, mayweed and chickweed.
With the area in spring cereal crops expanding year-on-year as an effective choice of weapon in controlling black-grass, growers are also facing a renewed battle against other weeds such as annual meadow-grass (AMG) and broad-leaved weeds, said Adama technical specialist David Roberts (right). He suggested that with the potential for spring cereals to provide as much as 80 per cent control of black-grass, as a key part of a whole approach, there is an increasing dependence on crops
such as spring barley and spring wheat. However, with few ‘on label’ herbicides recommended for grass weeds in spring cereals (particularly post-emergence), the threat from a wide range of broad-leaved weeds and the additional threat of resistance to herbicides each season, growers have their work cut out, explained Mr Roberts. “Resistance to ALS herbicides is a major issue, particularly so in poppy, mayweed and chickweed where we see resistance increasing. “ALS herbicides are among the most commonly used weed control products in the spring and so we must start doing something to address this problem and reduce the reliance on this chemistry,” he added.
With no varietal restrictions pre- or post-em for spring crops, Adama says that its herbicide Tower (chlorotoluron + diflufenican + pendimethalin) has full label approval for, and offers excellent control of, annual meadow-grass as well as a wide range of broad-leaved weeds in spring barley and spring wheat. With application rates up to 2-litres/ha, Mr Roberts said that there is considerable flexibility with Tower however he highlighted the need to manage the DFF loading. “In situations including later drilled crops, applying the product to very light soils and where the following crop is oilseed rape or a vegetable brassica, a DFF loading of 60g ai/ha (1.5-litres/ha Tower) is advised. We know DFF has the potential to affect following crops so the overall Tower dose should be
managed in accordance, but we are not seeing a big drop off in weed control with reduced rates of Tower,” he commented. In terms of managing ALS resistance in poppies, Mr Roberts suggested that there was no resistance to the components in Tower and that growers worried about resistance on their farms should consider Tower as a solution. He said that Tower gave additional efficacy on non-label weeds including field bindweed and fat hen. Mr Roberts concluded by highlighting that there had been several label changes to its winter cereal herbicide Hurricane (diflufenican), including the option of pre- and post-em application timing (as opposed to just pre-) to rye and triticale. ■
Spring weed control FACTS • • • •
There are few options for control of grass weeds in spring cereals Resistance to ALS herbicides is a major issue Tower has full label approval for AMG as well as broad-leaved weeds in spring barley and spring wheat There is no poppy resistance to the components of Tower
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Tank volumes of 3,000 to 5,000 litres User-friendly automated water system True-track following with Fieldtronic TrailCommand Divided baffle and low centre of gravity for excellent driving safety
20 www.farmersguide.co.uk February 2017
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Farmers Guide Magazine February 2017 Issue