Chekker® - Bayer CropScience

Chekker ®
Guide to effective use
Chekker provide a flexible solution for spring control
of cleavers and a wide range of broad-leaved weeds
in wheat, barley, rye and triticale.
Active ingredient guide
Active ingredient content g/ha
Product dose rate g/ha Amidosulfuron Iodosulfuron
Chekker 180 22.50 2.25
Chekker 240 30 3
Product profile
Crops Winter wheat, winter barley, spring barley, spring wheat, rye, triticale, durum wheat
Timing From 1st February and the 3 leaf stage (GS 13) of the crop up to before first spikelet of inflorescence visible
stage (GS 51)
Maximum rate 240 g/ha
Water rate/spray quality 100-400 L/ha
Apply using a pressure of 2.5-3.0 bar and a spray quality of MEDIUM (BCPC category)
Pack size 600 g
MAPP number 10955
LERAP Category B
Weeds controlled
Weed/Dose of Chekker 240 g/ha 200 g/ha 180 g/ha 150 g/ha 120 g/ha
Black-bindweed 6 leaves 6 leaves 6 leaves 4 leaves 4 leaves
Charlock Flower bud 4 leaves 4 leaves 4 leaves 4 leaves
Chickweed, Common Flower Bud 8 leaves 8 leaves 8 leaves 6 leaves
Cleavers Flower Bud 15 cm 15 cm 15 cm 10 cm
Common poppy MS 6 leaves 6 leaves 6 leaves 4 leaves 2 leaves
Common field-speedwell MS 6 leaves 6 leaves 4 leaves 4 leaves 2 leaves
Creeping Thistle (from seed) 6 leaves 6 leaves 4 leaves 4 leaves 2 leaves
Cut-Leaved Crane’s-bill 6 leaves 6 leaves 6 leaves 4 leaves 4 leaves
Fat-hen 6 leaves 6 leaves 4 leaves 4 leaves 4 leaves
Field forget-me-not 6 leaves 6 leaves 4 leaves 4 leaves 2 leaves
Field pansy 4 leaves 4 leaves 2 leaves 2 leaves 2 leaves
Fool’s parsley Flower Bud 6 leaves 6 leaves 4 leaves 4 leaves
Fumitory 6 leaves 6 leaves 4 leaves 4 leaves 2 leaves
Groundsel 6 leaves 6 leaves 4 leaves 4 leaves 2 leaves
Hemp-nettle Flower Bud Flower Bud 20 cm 15 cm 15 cm
Ivy-leaved speedwell 4 leaves 4 leaves 2 leaves 2 leaves 2 leaves
Knotgrass MS 4 leaves 4 leaves 4 leaves 2 leaves 2 leaves
Red dead-nettle 6 leaves 6 leaves 4 leaves 4 leaves 2 leaves
Redshank Flower Bud 6 leaves 6 leaves 4 leaves 4 leaves
Runch Flower Bud Flower Bud 20 cm 15 cm 15 cm
Scentless Mayweed Flower Bud 8 leaves 8 leaves 8 leaves 6 leaves
Stinking Mayweed Flower Bud 8 leaves 8 leaves 8 leaves 6 leaves
Shepherd's purse Flower Bud 6 leaves 6 leaves 6 leaves 4 leaves
Volunteer Beans Flower Bud Flower Bud 10 cm 10 cm 10 cm
Volunteer Oilseed Rape 5 leaves 4 leaves 4 leaves 4 leaves 4 leaves
Bold – recommendations included on the approved text label
MS = moderately susceptible

Chekker ®
Guide to effective use
Extension of Authorisation for Minor Use
Durum wheat, grassland (seed crop)
Extension of Authorisation no. 20060858
Linseed Extension of Authorisation no. 20101125
Sequences and tank-mixes
Chekker can be tank-mixed or used in sequence with the following ALS grass-weed herbicides at the following maximum dose rates:
Atlantis WG 400 g/ha with Chekker up to 240 g/ha
Hatra/Horus 1.2 L/ha Chekker up to 240 g/ha
Pacifica 400 g/ha with Chekker up to 180 g/ha
Othello 1 L/ha with Chekker up to 240 g/ha
All the above tank-mixes should have biopower added at 1 L/ha.
For the optimum grass-weed control with Atlantis WG, Hatra/Horus, Pacifica and Othello do not mix with any other product
apart from biopower.
Chekker is compatible with a range of other products. For latest information visit www.bayercropscience.co.uk or call Bayer Assist
on 0845 6092266 / 01223 226644.
Sprayer hygiene
To avoid subsequent damage to crops other than cereals it is important that the spray tank, boom, hoses, filters and nozzles are thoroughly washed
out to remove all traces of Chekker immediately after spraying using a proprietary sprayer cleaner according to the label instructions for that product.
Best use
For optimum results, apply Chekker during warm weather, when the soil is moist and the weeds actively growing
Dry conditions resulting in moisture stress may reduce effectiveness
Chekker can be used on all soil types
Control of weeds with Chekker is slow, particularly under cool, dry conditions. In some instances, the weeds may only be stunted but they
will normally have little or no competitive effect on the crop
Applications to spring barley may cause transient crop yellowing, however this should not affect yields
Cautions
Do not tank-mix or sequence with any other ALS inhibitor unless the sequence/tank mix is approved by CRD
In addition to cereals, winter oilseed rape and winter field beans may be sown in the same year as Chekker is applied and these must be
preceded by ploughing or thorough cultivation. A minimum of 3 months must separate an application of Chekker and the drilling of winter
oilseed rape
After an application of Chekker there are no restrictions on following cereal crops or crops sown in the spring of the following year
Key aspects of Chekker resistance management strategy
As part of the Herbicide Resistance Management Strategy for Chekker, do not apply Chekker in sequence with Atlantis WG, Hatra or Horus
for the spring control of common chickweed in order to avoid increased selection of herbicide resistant individuals.
Atlantis WG, Hatra, Horus, Chekker, Othello and Parcifica are registered trademarks of Bayer. Chekker contains iodosulfuron and
amidosulfuron. Atlantis, Hatra, Horus, Pacifica contain mesosulfuron and iodosulfuron. Othello contains mesosulfuron, iodosulfuron
and diflufenican.
Use plant protection products safely. Always read the label and product information before use. Pay attention to the risk indications
and follow the safety precautions on the label. For further information, please visit www.bayercropscience.co.uk or call Bayer Assist
on 0845 6092266 / 01223 226644. © Bayer CropScience Limited 2013.
Bayer CropScience Limited, 230 Cambridge Science Park, Milton Road, Cambridge, CB4 0WB