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A foliar applied herbicide for the control of cleavers, chickweed, mayweed and other annual broad-leaved weeds in wheat, barley, rye, triticale and durum wheat.

Chekker provides superior control of cleavers, particularly in cool, early spring conditions. It has flexible timing, from early spring right up to flower bud stage, and flexible dose rates to suit individual weed situations. Chekker can be used in all cereal crops except oats and its water-dispersible granule formulation makes it easy to use.

Wide range of tank-mixes available
Easy-to-use water-dispersible granule formulation
Can be applied in tank-mix or sequence with Atlantis WG, Hatra, Horus or Pacifica in winter wheat only
There are no restrictions on following cereal crops or crops sown in the spring of the following year
Winter oilseed rape and winter field beans may be sown in the same year as Chekker is applied and must be preceded by ploughing or thorough cultivation

For the best results apply Chekker during warm weather, when the soil is moist and the weeds are actively growing. Levels of control can be reduced in poor growing conditions. Chekker can be applied after 1st February from two-leaf stage (GS 12) right up to GS 51, before the first spikelet of inflorescence is just visible. To reduce the risk of resistance, application should be made to young, actively-growing weeds.

Don’t use in tank-mix or sequence with any other ALS inhibitor except Atlantis WG (mesosulfuron-methyl and iodosulfuron-methyl-sodium), Hatra (mesosulfuron-methyl and iodosulfuron-methyl-sodium), Horus (mesosulfuron-methyl and iodosulfuron-methyl-sodium), Othello (mesosulfuronmethyl, iodosulfuronmethyl-sodium and diflufenican) or Pacifica (mesosulfuron-methyl and iodosulfuron-methyl-sodium)
Always add Chekker to the tank-mix first
Don’t tank-mix Chekker with fop/dim herbicides
Wherever possible, apply the fop/dim herbicides before Chekker and leave an interval of five days before applying Chekker
Where Chekker is applied first, always leave an interval of 14 days before applying fop/dim herbicides
Don’t apply to crops undersown or due to be undersown with clover and alfalfa
Don’t roll or harrow within one week of spraying
Don’t spray crops under stress, suffering drought, waterlogged, grazing, lacking nutrients or if the soil is compacted.

Chekker can be used in sequence on winter wheat after an autumn-applied Atlantis WG.
In spring, Chekker can be used in tank-mix or in sequence with Atlantis WG, Hatra, Horus, Othello or Pacifica at the 400g/ha rate only.

WHEAT, BARLEY, RYE, TRITICALE, DURUM WHEAT
Maximum individual dose: 240 g product per hectare
Maximum number of treatments: 1 per crop
Latest time of application: Flag leaf ligule just visible (GS39)
Other specific restrictions: This product must only be applied from 1 February in the year of harvest until the specified latest time of application.

DIRECTIONS FOR USE
IMPORTANT: This information is approved as part of the Product Label. All instructions within this section must be read carefully in order to obtain safe and successful use of this product.

RESTRICTIONS
Only the following “ALS inhibiting” herbicides can be applied to the same crop in tank mixture or in sequence with Chekker: Atlantis WG, Hatra, Horus, Pacifica or Othello.
DO NOT apply to crops undersown or due to be undersown with grass, clover or alfalfa.
DO NOT roll or harrow within one week of spraying.
DO NOT spray crops under stress, suffering drought, waterlogged, grazed, lacking nutrients or if the soil is compacted.
Broadcast crops should be sprayed post-emergence after the plants have a well established root system and all other conditions on the label and leaflet are met.
DO NOT spray if frost is expected. If the leaves are wet or covered with ice, run off may occur.
Store in a cool, dry, safe place designated as an agrochemical store, away from seeds & animal feedingstuffs.

WEEDS CONTROLLED
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.
If present at application, the following weeds will be controlled:

Weed: Black bindweed
Post-emergence control at 240 g/ha up to: 6 true leaves

Weed: Charlock
Post-emergence control at 180 g/ha up to: 4 true leaves
Post-emergence control at 240 g/ha up to: flower bud

Weed: Chickweed
Post-emergence control at 180 g/ha up to: 8 true leaves
Post-emergence control at 240 g/ha up to: flower bud

Weed: Cleavers
Post-emergence control at 180 g/ha up to: 15 cm
Post-emergence control at 240 g/ha up to: flower bud

Weed: Common field speedwell
Post-emergence control at 240 g/ha up to: 6 true leaves (MS)

Weed: Field forget-me-not
Post-emergence control at 240 g/ha up to: 6 true leaves

Weed: Knotgrass
Post-emergence control at 240 g/ha up to: 4 true leaves (MS)

Weed: Mayweed
Post-emergence control at 180 g/ha up to: 8 true leaves
Post-emergence control at 240 g/ha up to: flower bud

Weed: Poppy
Post-emergence control at 240 g/ha up to: 6 true leaves (MS)

Weed: Shepherd’s purse
Post-emergence control at 180 g/ha up to: 6 true leaves
Post-emergence control at 240 g/ha up to: flower bud

Weed: Volunteer oilseed rape
Post-emergence control at 240 g/ha up to: 5 true leaves

Weed: Wild radish
Post-emergence control at 240 g/ha up to: flower bud

MS = Moderately Susceptible)
Kill of weeds with Chekker is slow, particularly under cool, dry conditions.
Sometimes, the weeds may only be stunted but they will normally have little or no competitive effect on the crop.

CROP SPECIFIC INFORMATION
All commercially available varieties of; winter wheat, winter barley, spring wheat spring barley, rye, triticale and durum wheat.
Apply Chekker from the three-leaf stage of the crop up to flag leaf ligule just visible (GS39).
Apply in spring (from 1 February) when the weeds are actively growing. Apply at a rate of use 240g per hectare.
For optimal results, use application techniques which ensure good weed coverage and crop penetration.
Volume: 200-400 litres of water per hectare. Use up to 400 litres of water per hectare where crops are thick or weeds dense. Qualified recommendation: Lower water volumes (100 L/ha) may also be used, however these have not been supported by effectiveness or crop safety data.

Pressure: 2.5 - 3.0 bar

Spray Quality: MEDIUM (BCPC category).
Take care to avoid drift onto broad-leaved plants outside the target area or onto ponds, waterways and ditches. Avoid spray overlaps, particularly when applying prior to stem extension of winter and spring barley, as this may result in reduced vigour and yield reductions.

SEQUENCES AND TANK-MIXTURES
Only one of the following “ALS inhibiting” herbicides can be applied to the same crop in sequence or tank mixture with up to 240 g/ha Chekker: Atlantis WG, Hatra, Horus, Othello or with 180 g/ha Chekker: Pacifica (applied up to 0.4 Kg/ha).
These sequences and tank mixtures must only be applied in accordance with label recommendations for every product in the sequence or tank mixture. Aside from those listed above, do not use Chekker in any non-approved ALS sequence or tank mixture.
Only use permitted sequences and tank mixtures in conjunction with a robust non- ALS inhibitor autumn herbicide programme, this is particularly important where both components are applied in the spring.

HERBICIDE RESISTANCE MANAGEMENT
This product contains amidosulfuron and iodosulfuron-methyl-sodium which are ALS inhibitors, also classified by the Herbicide Resistance Action Committee as ‘Group B’. To reduce the risk of developing resistance or where resistance to sulfonylurea herbicides is suspected applications should be made to young, actively growing weeds.
As part of the Resistance Management Strategy for Chekker, do not apply Chekker in sequence with autumn applied Atlantis WG, Hatra, Horus or Pacifica for the spring control of common-chickweed in order to avoid increased selection of herbicide resistant individuals. The use of cultural methods of control and herbicides with non-ALS modes of action within the cropping season and/or throughout the cropping rotation will help reduce the risk of developing resistance. Always monitor effectiveness of weed control and investigate any patches of poor control. If unexplained, contact your agronomist, who may consider a resistance test appropriate.

FOLLOWING CROPS
After an application of Chekker there are no restrictions on following cereal crops or crops sown in the spring of the following year.
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 three months must separate an application of Chekker and the drilling of winter oilseed rape.
Where Chekker is applied in sequence or tank mixture with Atlantis WG, Hatra, Horus, Pacifica or Othello, winter wheat, winter barley, spring wheat, spring barley and sugar beet can be sown as following crops in the normal rotation.

MIXING
Half fill the spray tank with clean water, start agitation and add the required quantity of Chekker directly to the tank. Top up the tank to the required volume. Continue agitation whilst spraying.

Sprayer hygiene
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 and before the sprayer is used on crops other than the cereals recommended on this label.
Use either of the following procedures:-
(a) Bleach cleaning
1. Drain sprayer completely, then wash out tank boom and hoses with clean water. Drain again.
2. Half-fill tank with clean water and add chlorine bleach (i.e. bleach with 10% available chlorine) at a dilution rate of 2.5 litres of bleach per 1,000 litres of water. Complete filling the tank with water. Flush through boom and hoses then leave sprayer for 10 minutes with agitation on. Then drain completely.
3. Remove nozzles and filters and leave to soak in a bleach solution of 250 ml bleach per 10 litres of water whilst tank cleaning is in progress.
4. Flush the tank, boom and hoses with clean water.
5. Inspect tank to confirm no residues are present. Ensure any spray contamination on the outside of the sprayer is removed by washing in clean water.
(b) Ammonia based cleaning (e.g. All Clear Extra)
Follow manufacturers’ recommendations for sulfonyl urea herbicides.
DO NOT MIX any bleach or chlorinating agent with any ammonia-based cleaning agent as toxic gases may be liberated.