OmarraPlant Protection Product ComparisonPlant Protection Product ComparisonReport inaccuraciesReport inaccuracies

NOTE: These Directions for Use form part of the Approved Product label and must be carefully read before using the product to achieve safe and successful use.

 

 

OMARRA is a systemic grass herbicide that belongs to the ACCase class of compounds. It will kill grass weeds that have emerged at the time of application but will not control those that are yet to emerge. Species that are susceptible to OMARRA include annual meadow-grass, black-grass, cereal volunteers, common couch, sterile brome and wild oats. Best control is achieved when weeds are small, i.e. before they start to tiller and before they start to compete with the crop. Where black-grass is the main target species and resistance is thought to occur, application before the grass starts to tiller is particularly important.

 

 

OMARRA is absorbed by the green leaves of grasses and translocated to the base of the plant where it kills the growing point. The leaves show visible symptoms 3 – 4 weeks after application under good growing conditions but activity may take longer under cool conditions. Adequate soil moisture is needed to allow transport of the active ingredient within the grass and very dry soils may inhibit activity. Because it works by contact action, OMARRA can be used on all soil types.

 

Some strains of grass weeds have developed resistance to many herbicides and where these form a significant part of the weed population, control may be unsatisfactory. To reduce the risk of this occurring, an anti-resistance strategy including cultural methods of control should be adopted and guidelines have been published by the Weed Resistance Action Group. Copies of these guidelines are available from HGCA, CPA, your distributor or your advisor. Grass seed can be tested for resistance to herbicides to allow managed application of different herbicide classes but, where resistance is thought to occur, ensure target weeds are treated before they start to tiller and DO NOT use reduced dose rates.

Consult processors before application to crops destined to be processed.

Prevent drift onto non-target plants, especially cereals and grasses, or severe damage may result.

DO NOT apply to crops that are stressed or damaged. Causes of stress or damage can be pest or disease attack, previous herbicide applications or adverse weather conditions.

DO NOT apply if rain or frost is predicted or if the foliage is wet.

Use of a detergent cleaner in the spray tank before using OMARRA is advised to clear any chemical residues from previous applications. OMARRA is an effective tank cleaner and any residues it releases from the tank may harm the crop.

DO NOT overlap spray swathes, particularly when treating oilseed rape or bulb onions, since this may result in some crop effects and reduced yields.

Where oilseed rape crops are of poor vigour and low yield potential, application of OMARRA should be delayed until vigour improves.

Use of OMARRA in sequence with pre-emergence products is permitted only where the crop is suffering no ill effects of the previous treatment. When used in sequence with post-emergence products, a 14 day interval should be left between each treatment and wax protection on the leaves must recover before OMARRA is applied.

 

NOTE the timing restrictions listed in the Statutory Box – no applications to sugar beet, fodder beet, linseed and green cover on land not being used for crop production (set-aside) between 1st November and 31st March; no applications to field beans, vining & combining peas, leeks, bulb onions, carrots, cabbage and cauliflowers between 1st November and 1st March.

Apply OMARRA from when the expanded cotyledon stage until the crop has 9 fully expanded leaves or up until the 30th November, whichever occurs first. Use a maximum dose of 1.0 L/ha irrespective of the weed species present.

Apply OMARRA after 31st March from when the crop has 2 true leaves until before flower buds are visible within the crop. Use a maximum dose of 1.5 L/ha.

Apply OMARRA after 31st March from when the crop has fully expanded cotyledons until before row closure of the crop. Use a maximum dose of 1.5 L/ha.

Conduct a leaf wax test to using a crystal violet test kit to ensure adequate wax protection before treatment. Apply OMARRA from the 2 node stage until before the crop canopy prevents adequate spray penetration. All pea varieties are safe to treat provided that they have sufficient wax protection but note that winter pea varieties can only be treated in the spring after 1st March.

Winter and spring field beans can only be treated in the spring after 1st March. Apply OMARRA to winter beans from when the crop has 3 leaves until 6 visibly extending internodes and to spring bean varieties from the 2 leaf stage until the first side shoot becomes visible.

Apply OMARRA from when the cotyledon has a whip-like form (whip stage) of bulb onions and from the 3 leaves clearly visible stage of leeks until 4 weeks before harvest. A split-dose can be used to control successive flushes of annual meadow-grass but only a single application is permitted against black-grass, Italian ryegrass and wild oats to help reduce the risk of resistance developing.

Apply OMARRA from when the carrots have one fully expended true leaf until 3 weeks before harvest.

Apply OMARRA from when the cabbages have four true leaves and from when cauliflowers have two true leaves up until the beginning of head formation in both crops (Cupping). 3.9 Green cover on land not being used for food production.

OMARRA can be applied to set-aside areas to control grass weeds and volunteer cereals provided that sufficient broad-leaved species known to be tolerant of OMARRA are present to maintain sufficient cover to comply with regulations. NOTE that applications between 1st November and 31st March are prohibited.

 

OMARRA must be applied through a conventional hydraulic sprayer. Application using a knapsack sprayer is not permitted. When preparing to spray OMARRA, half-fill the spray tank with clean water and start the agitation. Shake the container well to ensure mixing and add the required amount of OMARRA to the spray tank. Rinse any containers that are emptied and add these rinsings to the spray tank. Top up with clean water and maintain agitation until spraying is finished. Apply OMARRA as a FINE or MEDIUM spray as defined by BCPC in a water volume of 100 – 200 litres/ha. NOTE that OMARRA has an adjuvant system incorporated in the formulation and does not require additional adjuvant.

 

 

Tank Mixes: OMARRA can be tank mixed with some other products. If using tank mixes, unless directed otherwise the preferred order of addition of products to the tank is: water dispersible granules, wettable powders, suspension concentrates (flowables), emulsifiable concentrates, solution concentrates. Each product must be added to a half-full sprayer and be fully dispersed before the addition of the next product.

Two –way compatible mixtures include:

Reynard + OMARRA in peas and field beans only

Meta WDG up to 1.7 kg/ha + OMARRA in sugar beet only.

 Seal Z (MAPP 14201) + OMARRA in peas and field beans only. Tank mixes must only be applied within the label recommendations of every product in the mix. Contact AgchemAccess Ltd. for compatibility information on specific tank mixes for use in sugar beet, field beans or peas.

 

Provided normal seedbed cultivations are carried out before sowing:

Broadleaved crops may follow application of OMARRA at any time.

Wheat and barley may be sown 2 weeks after application.

 Maize and Italian ryegrass may be sown from 8 weeks after application provided that the soil is cultivated to a depth of 20cms.

NOTE: Graminaceous crops other than wheat, barley, maize and Italian ryegrass should not be sown as the next crop.

 

All goods supplied by us are of high grade and we believe them to be suitable but, as we cannot exercise control over their storage, handling, mixing or use or the weather conditions before, during and after application which may affect the performance of the goods, all conditions and warranties, statutory or otherwise, as to the quality or fitness for any purpose of our goods are excluded and no responsibility will be accepted by us or re-sellers for any failure in performance, damage or injury whatsoever arising from their storage, handling, application or use. These conditions cannot be varied by our staff or agents whether or not they supervise or assist in the use of such goods.