Cleravo

Manufacturer
BASF
Category
Herbicides
Registered until
2026-10-31
Registration number
16877
Active materials
Links
A suspension concentrate containing 35 g/l imazamox and 250 g/l quinmerac.
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.
CLERAVO is a contact and residual herbicide that can be used for the control of a range of broad leaved and grass weeds in any Clearfield oilseed rape hybrid carrying the Clearfield brand.
 Restrictions/Warnings
CLERAVO MUST ONLY BE USED ON CLEARFIELD OILSEED RAPE HYBRIDS.
COMPLETE CROP LOSS WILL OCCUR IF CLERAVO IS APPLIED TO OILSEED RAPE THAT DOES NOT CARRY THE CLEARFIELD BRAND.
As with other oilseed rape hybrids, seed from CLEARFIELD oilseed rape should not be farm-saved.
Do not apply CLERAVO to crops suffering from stress, which may be caused, for example, by pests, disease, waterlogging, poor seedbed conditions or previous chemical treatment.
Do not apply when heavy rain is forecast. Under frosty conditions a transient scorch may occur. Weeds germinating from depth may not be controlled.
Soil moisture is required for effective weed control via root uptake. Residual control may be reduced under prolonged dry conditions.
Care should be taken to avoid overlap of spray swaths.
Do not disturb the soil after application. CLERAVO is suitable for use on all soil types as defined by the Soil Texture (85) System, except sands, very light soils and soils containing more than 10% organic matter.
Do not apply to stony soils; i.e. stones, flints or chalk readily visible on surface. On brashy or stony soils, Cleravo may cause some reduction in crop vigour and/or plant stand.
Do not apply to cloddy seedbeds. Seedbeds must have a fine, firm tilth for optimum weed control. Loose or cloddy seedbeds must be consolidated prior to application.
Do not apply to waterlogged soils or soils prone to waterlogging.
Extreme care is required to avoid spray drift on to neighbouring crops and non-target plants outside the target area, especially when spraying next to crop species that are more sensitive to CLERAVO e.g. potato, carrot, parsley, parsnip and herbs.
 
 Weed Control
CLERAVO is taken up via cotyledons, roots and shoots and takes maximum effect before, or shortly after, weed emergence. Weeds germinating from depth may not be controlled.
Soil moisture is required for effective weed control via root uptake. Residual control may be reduced under prolonged dry conditions.
 Susceptibility of weeds to single applications of CLERAVO.
Best results will be achieved by application to small actively growing weeds. * The addition of 1.0 l/ha Dash HC will improve the level and consistency of control.
 
WINTER OILSEED RAPE ,SPRING OILSEED RAPE 
Weed: Black-grass
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: CLERAVO-Resistant ;
                            +  Dash HC-Resistant ;
Weed:Annual mercury
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-4lvs;  CLERAVO-Moderately Resistant;+  Dash HC-Moderately Susceptible;
 
Weed:Black-bindweed
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-2lvs ; +  Dash HC-Moderately Susceptible ;
 
Weed:Charlock
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-6lvs; CLERAVO-Susceptible ; +  Dash HC-Susceptible ;
 
Weed:Chickweed, common
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-1st side shoot visible; CLERAVO-Susceptible ;+  Dash HC-Susceptible ;
 
Weed:Cleavers
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-1st side shoot visible;  CLERAVO-Susceptible  ;  +  Dash HC-Susceptible  ;
 
Weed:Crane‘s-bill, cut-leaved
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-4lvs; CLERAVO- Susceptible  ;  +  Dash HC-Susceptible   ;
 
Weed:Crane‘s-bill, round-leaved
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-4lvs; CLERAVO-Moderately Susceptible ;     +  Dash HC-Susceptible   ;
 
Weed:Crane‘s-bill, small-flowered
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-4lvs; CLERAVO-Resistant ; +  Dash HC-Moderately Susceptible;
 
Weed:Dead-nettle, henbit 
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-1st side shoot visible; CLERAVO-Susceptible   ;  +  Dash HC-Susceptible   ;
 
Weed:Dead-nettle, red
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-2 lvs; CLERAVO-Susceptible ;  +  Dash HC- Susceptible;
 
Weed:Fat hen
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-9lvs; CLERAVO- Moderately Susceptible;+  Dash HC-Susceptible ;
 
Weed:Flixweed
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-4 lvs; CLERAVO-Susceptible  ;+  Dash HC-Susceptible  ;
 
Weed:Groundsel
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-4 lvs;  CLERAVO-Moderately Resistant ; +  Dash HC-Susceptible  ;
 
Weed:Mayweed, scented
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-4 lvs; CLERAVO-Moderately Susceptible ; +  Dash HC-Susceptible ;
 
Weed:Mayweed, scentless
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-4 lvs; CLERAVO-Moderately Susceptible ; +  Dash HC-Susceptible ;
 
Weed:Mustard, hedge
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-6 lvs; CLERAVO- Susceptible  ; +  Dash HC- Susceptible  ;
 
Weed:Mustard, white
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-before stem extension;   +  Dash HC-Susceptible   ;
 
Weed:Pansy, field
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-8 lvs; CLERAVO- Resistant;+  Dash HC-Moderately Resistant ;
 
Weed:Pineappleweed
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-4 lvs;CLERAVO-Susceptible   ; +  Dash HC-Susceptible   ;
 
Weed:Poppy, common 
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-2 lvs;CLERAVO- Moderately Susceptible ; +  Dash HC-Susceptible ;
 
Weed:Redshank
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-6 lvs; +  Dash HC- Susceptible;
 
Weed:Runch (Wild radish, Jointed charlock)
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-6 lvs; CLERAVO-Susceptible   ;+  Dash HC- Susceptible   ;
 
Weed:Shepherd‘s purse
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-8 lvs; CLERAVO- Moderately Susceptible  ;+  Dash HC- Susceptible  ;
 
Weed:Sow-thistle, perennial
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments: Max weed GS-3 lvs; CLERAVO-Resistant ;+  Dash HC-Moderately Susceptible ;
 
Weed: Sow-thistle, prickly
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-3 lvs; CLERAVO-Susceptible   ; +  Dash HC-Susceptible   ;
 
Weed:Speedwell, common field
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-4 lvs; CLERAVO-Moderately Susceptible ;+  Dash HC-Susceptible ;
 
Weed:Speedwell, ivy-leaved
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-4 lvs; CLERAVO- Susceptible   ; +  Dash HC-Susceptible;
 
Weed: Speedwell, wall
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-4 lvs; CLERAVO-Susceptible ; +  Dash HC-Susceptible ;
 
Weed:Volunteer oilseed rape 
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-4 lvs; CLERAVO-Susceptible  ; +  Dash HC-Susceptible  ;
 
Weed: Volunteer barley 
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC
Critical Comments:Max weed GS-2 tillers; CLERAVO- Resistant ; +  Dash HC- Susceptible;
 
Weed:Volunteer wheat
Rate: Apply CLERAVO at 1.0 litre per hectare
        + 1.0 l/ha Dash HC

Critical Comments: Max weed GS-1 tillers; CLERAVO- Resistant ; +  Dash HC- Susceptible;

Weed resistance management
This product contains imazamox which is an ALS inhibitor, also classified by the Herbicide Resistance Action Committee as ‘Group B’. Only use as part of a weed resistance management strategy that includes cultural methods of control and does not use ALS inhibitors as the sole chemical method of grass-weed control.
Strains of some annual grasses (e.g. Black-grass, Wild-Oats, and Italian Ryegrass) have developed resistance to herbicides, which may lead to poor control. A strategy for preventing and managing such resistance should be adopted. Guidelines have been produced by the Weed Resistance Action Group and copies are available from the HGCA, CPA, your distributor, crop adviser or product manufacturer.
Populations of Black-grass, Italian ryegrass, Chickweed and Poppy with high levels of resistance may not be fully controlled.
Key elements of the weed resistance management strategy for CLERAVO:- - Always follow WRAG guidelines for preventing and managing herbicide resistant weeds.- Maximise the use of cultural control measures wherever possible (e.g. crop rotation, ploughing, stale seedbeds, etc). - Adopt as diverse a rotation as possible using autumn and spring sown crops. - Consider rotational ploughing every 3 to 5 years to improve black-grass control. - Where the Clearfield crop is to be established by non-inversion tillage it is important to obtain high levels of black-grass control in the previous crop. - Do not rely on one herbicide mode of action for the control of grass or broad-leaved weeds in the same field over several years. - For the control of Black-grass, Ryegrass and Wild oats, always use CLERAVO in tank mix or sequence with other effective graminicides with different modes of action. - Apply post-emergence products/mixtures to small, actively growing weeds to maximise the level of control. - Where there is significant risk of the development of ALS resistant grass weeds, consider the inclusion of a spring crop(s) in the rotation, to increase the opportunity for cultural control measures. - Monitor fields regularly and investigate the reasons for any poor control.
 
Crops
CLERAVO can be used on any spring or winter Clearfield oilseed rape hybrid carrying the Clearfield® brand.
For a list of current Clearfield oilseed rape hybrids contact either your local BASF Agronomy Manager or the BASF Technical Services Hotline: 0845 602 2553
COMPLETE CROP LOSS WILL OCCUR IF CLERAVO IS APPLIED TO OILSEED RAPE THAT DOES NOT CARRY THE CLEARFIELD BRAND.
To ensure that CLERAVO, is only be applied to Clearfield oilseed rape hybrids, it is important to clearly and accurately record the location of Clearfield oilseed crops on the farm and provide relevant information to those staff and contractors applying CLERAVO.
 Time of application: Clearfield varieties of Winter Oilseed Rape; CLERAVO may be applied post emergence of the crop from two fully expanded cotyledons (GS 10) and up to and including the eight true leaf growth stage (GS 18). Clearfield® varieties of Spring Oilseed Rape; CLERAVO may be applied post emergence of the crop from two fully expanded cotyledons (GS 10) and up to and including the eight true leaf growth stage (GS 18).
Rate of application: Apply CLERAVO at 1.0 litre per hectare. Improved control of certain weed species can be achieved by applying 1.0 l/ha CLERAVO plus 1.0 l/ha of the adjuvant Dash HC.
 
Following Crops
Following crops after normally harvested Clearfield oilseed rape
Crops such as wheat, barley, oats, oilseed rape, field beans, peas, maize and sunflower can follow normally harvested Clearfield oilseed rape treated with CLERAVO in either the autumn or spring. Sugar beet should only follow normally harvested Clearfield oilseed rape when the CLERAVO is applied in the autumn.
Re-drilling due to crop failure
In the event of crop failure, the following crops may be re-drilled following ploughing or cultivation to at least 20cm
Following crop:Clearfield oilseed rape, Maize, Peas
Recommended interval prior to re-drilling:4 weeks after application
Following crop:Wheat, Barley, Oats
Recommended interval prior to re-drilling:8 weeks after application
Following crop:Field beans
Recommended interval prior to re-drilling: 10 weeks after application
Following crop:Sunflower
Recommended interval prior to re-drilling:15 weeks after application
It is advised that in the event of crop failure, re-drilling of winter or spring oilseed rape (i.e. non-Clearfield oilseed rape) or sugar beet should be avoided due to a risk of crop injury.
 
 Mixing and Spraying
Application
Apply CLERAVO in 100–400 l/ha water volume as a MEDIUM spray as defined by BCPC. In more dense crops where weed shading is more likely use the higher water volume.
To ensure optimum spray coverage and minimize spray drift, adjust the spray boom to the appropriate height above the crop, according to guidance provided by the sprayer and/or nozzle manufacture.
 Mixing
Never prepare more spray solution than is required.
Fill the spray tank three quarters full with water and start the agitation. To ensure thorough mixing of the product, invert the container several times before opening. Add the required quantity of CLERAVO to the spray tank while re-circulating. If required add Dash HC and then the remainder of the water. Continue agitation until spraying is completed.
On emptying the product container, rinse container thoroughly by using an integrated pressure rinsing device or manually rinsing three times. Add washings to sprayer at time of filling and dispose of container safely.
Sprayer cleaning
Wash sprayer thoroughly (rinsing three times) immediately after use, using clean water and following best practice advice and the guidance provided by the equipment manufacturer. Use of a proprietary spray tank cleaner is recommended.
 
Controlling volunteers from Clearfield oilseed rape
Best management practice is to control volunteer oilseed rape plants in the immediate following crop or prior to its establishment.
Volunteers from Clearfield oilseed rape can be controlled with established techniques using a combination of stale-seedbeds, non-selective herbicides, selective herbicides and cultivation methods: Following a Clearfield oilseed rape crop, post-harvest rainfall will encourage volunteer oilseed rape to germinate, therefore where possible delay any post-harvest cultivations or stubble-hygiene herbicide treatments until this has occurred. Use a stale-seedbed technique to destroy germinated oilseed rape seedlings using an approved non-selective herbicide treatment, for example glyphosate, and/or cultivation.  Should further germination of volunteer oilseed rape occur, consider repeating the above stale-seedbed process prior to establishment of the next crop.  Should volunteer oilseed rape emerge post-harvest elsewhere within the rotation consider stale-seedbed techniques between subsequent crops.  Where it is planned for Clearfield oilseed rape stubble to be used as extended over-wintered stubbles/natural regeneration, volunteer Clearfield oilseed rape must be destroyed in time to prevent viable seeds, paying attention to agronomic guidance and/or management restrictions that may apply to the stubble maintenance.
Registered for culturesRateBBCH
Winter rape1 l10 - 19
Spring rape1 l10 - 19