Dow Shield 400

Manufacturer
Dow AgroSciences
Category
Herbicides
Registered until
2024-10-31
Registration number
14984
Active materials
Links
Dow Shield® 400 is a post-emergence herbicide which provides economic control of a range of perennial and annual broad-leaved weeds in oilseed rape, sugar beet and a wide range of other crops.
A soluble concentrate containing 400 g ae/litre (36% w/w) clopyralid (527 g/litre clopyralid-olamine).
 
GENERAL WARNING
ALL CROPS
Do not use any plant material treated with DOW SHIELD 400 for composting or mulching. Do not use manure from animals fed on crops treated with DOW SHIELD 400 for composting.
ALL CROPS (EXCLUDING CEREALS AND LINSEED)
DOW SHIELD 400 residues in plant tissues (including manure and digestate) which have not completely decayed may affect succeeding susceptible crops. If treated crop remains have not fully decayed by the time of planting following crops then avoid planting: peas, beans and other legumes; carrots and other Umbellifers; potatoes; lettuce and other Compositae; glasshouse and protected crops.
Following application of DOW SHIELD 400 to crops other than cereals, do not plant susceptible autumn-sown crops (e.g. winter beans) in the same year as treatment with DOW SHIELD 400. Where susceptible crops are to be planted in spring, do not apply DOW SHIELD 400 later than the end of July of the previous year.
Chop and incorporate all treated plant remains in the early autumn (or as soon as possible after harvest) to release any residues into the soil, where they are more quickly broken down. Following good agronomic practice ensure that stubble and straw (including farmyard manure) and other treated plant remains have completely decayed before planting susceptible crops.
CEREALS AND LINSEED STRAW
Straw from cereals and linseed sprayed with DOW SHIELD 400 may contain residues which could damage certain crops. To avoid such risk:
CEREALS:
Field Crops: Bale and cart away the straw. Where straw is chopped and incorporated do not plant winter beans in the same year as treatment with DOW SHIELD 400.
Glasshouse Crops: Straw from treated crops should not be used or supplied for use as straw in compost, poultry litter, manure or spent mushroom compost for any glasshouse crop. Straw from treated crops may be used for strawing down strawberries.
LINSEED: Bale and cart away the linseed straw. Where linseed straw is chopped and incorporated do not plant winter beans in the same year as treatment with DOW SHIELD 400.
NOTES
For best results apply DOW SHIELD 400 when the weeds are actively growing. Control of mayweeds may be reduced if they are suffering from drought stress at the time of application.
Control of creeping thistle and other perennial weeds may be impaired by cultivations either before or within a period of two weeks after application of DOW SHIELD 400.
In common with good spraying practice DOW SHIELD 400 should not be applied when the crop is damp or when rainfall is expected within six hours.
Do not spray when crops are under stress from cold, drought, pest damage, nutrient deficiency etc.
Consult processors before using on crops for processing.
 
Contract agents should be consulted before using on crops grown for seed.
Do not apply to crops undersown with clover or other legume containing mixtures.
DOW SHIELD 400 is not subject to vapour drift, but do not spray in windy weather and avoid drift onto susceptible crops (e.g. seed potatoes).
Take care to avoid drift onto crops and non-target plants outside the target area.
Wash spraying equipment thoroughly with water and a liquid detergent immediately after use. Spray out. Fill with clean water and leave overnight. Spray out again before storing or using another product, particularly where changing over from herbicides to insecticides. Traces of DOW SHIELD 400 can cause harm to susceptible crops (e.g. seed potatoes) sprayed later.
 
DOW SHIELD 400 should only be applied in tank mix with other products if any requirement or restrictions on the other product label does not conflict with the requirements or restrictions of DOW SHIELD 400. Tank mixes should not be allowed to stand in the tank and agitation should be maintained at all times.
 
MIXING
Fill the spray tank half full with water and add the required amount of DOW SHIELD 400 mixing well, then complete filling. If using a tank mix the other products should be mixed with the water first following the label instructions, and DOW SHIELD 400 added last. The spray mix must be agitated continuously until application is complete.
 
SPRAY QUALITY
Apply DOW SHIELD 400 as a MEDIUM spray as defined by the BCPC system.
 
ANNUAL WEED SUSCEPTIBILITY
Weed susceptibility to the most commonly recommended rates of DOW SHIELD 400 are given in the weed tables below. For further details of rates, timings, etc., please refer to the individual crop sections.
Weed:Corn marigold  
Rate:0.25 litre/ha 
Growth Stage:2 leaf
Rate:0.5 litre/ha
Growth Stage:4 leaf
 
Weed:Creeping thistle (from seed) 
Rate:0.25 litre/ha 
Growth Stage:4 leaf 
Rate:0.5 litre/ha
Growth Stage:6 leaf
 
Weed:Groundsel  
Rate:0.25 litre/ha 
Growth Stage:6 leaf
Rate:0.5 litre/ha
Growth Stage:10 leaf
 
Weed:Pineappleweed 
Rate:0.25 litre/ha 
Growth Stage:4 leaf 
Rate:0.5 litre/ha
Growth Stage:8 leaf
 
Weed:Scented mayweed 
Rate:0.25 litre/ha 
Growth Stage:4 leaf
Rate:0.5 litre/ha
Growth Stage: 8 leaf
 
Weed:Scentless mayweed 
Rate:0.25 litre/ha 
Growth Stage:4 leaf 
Rate:0.5 litre/ha
Growth Stage:8 leaf
 
Weed:Smooth sow-thistle 
Rate:0.25 litre/ha 
Growth Stage:2 leaf 
Rate:0.5 litre/ha
Growth Stage:4 leaf
 
Weed:Black-bindweed 
Rate:0.25 litre/ha 
Growth Stage:1 leaf 
Rate:0.5 litre/ha
Growth Stage:2 leaf
 
Weed:Pale persicaria 
Rate:0.25 litre/ha 
Growth Stage:1 leaf
Rate:0.5 litre/ha
Growth Stage: 2 leaf
 
Weed:Redshank 
Rate:0.25 litre/ha 
Growth Stage:1 leaf
Rate:0.5 litre/ha
Growth Stage:1 leaf
 
PERENNIAL WEED SUSCEPTIBILITY
Control by 0.25 litre/ha + 0.5 litre/ha programme.
Creeping thistle           S
Perennial sow-thistle    MS
Dandelion                    S
Spear thistle                S
White clover (10 cm diameter) MS
 
S = Susceptible; Complete or near complete kill MS = Moderately Susceptible; Good kill under favourable conditions DOW SHIELD 400 applied in the 0.25 litre/ha + 0.5 litre/ha programme will also give some suppression of young plants of amphibious bistort and colt's-foot.
 
OILSEED RAPE
AUTUMN SOWN OILSEED RAPE
DOW SHIELD 400 can be applied to all varieties of autumn sown oilseed rape in the spring from the two fully expanded leaf stage but before the flower buds are visible above the crop canopy.
Perennial Weed Control
For the control of creeping thistle apply DOW SHIELD 400 at 0.5 litre in 200 to 250 litres of water per hectare at the weed rosette stage (up to 30 cm across).
Annual Weed Control
For annual weeds apply DOW SHIELD 400 at 0.25 litre/ha in the spring. In competitive crops of oilseed rape mayweeds up to 10 cm in diameter will be well controlled by DOW SHIELD 400 at 0.25 litre/ha. Apply in a water volume of 200 to 400 litres/ha.
SPRING SOWN OILSEED RAPE
DOW SHIELD 400 can be applied to all varieties of spring sown oilseed rape for the control of annual weeds or creeping thistle. For annual weeds apply DOW SHIELD 400 at 0.25 litre in 200 to 250 litres of water per hectare. For creeping thistle apply DOW SHIELD 400 at 0.25 litre/ha at the rosette stage followed by a second application three to four weeks later of 0.5 litre in 200 to 250 litres of water per hectare. SUGAR BEET, RED BEET, FODDER BEET AND MANGELS
CONVENTIONAL VOLUMES
For the control of annual weeds apply 0.25 litre in 200 to 250 litres of water per hectare. For the control of creeping thistle apply 0.25 litre in 200 to 250 litres of water per hectare at the rosette stage, followed by a second application of 0.5 litre in 200 to 250 litres of water per hectare three to four weeks later.
Use Alone
DOW SHIELD 400 may be used alone from the fully expanded cotyledon stage of the crop.
Compatibility
DOW SHIELD 400 at 0.25 litre/ha is compatible with the following products at the rate recommended by the manufacturers.
 
Goltix Flowable + Cropspray 11E
Minimum Crop Size:First true leaves 10 mm long 
Notes:Improves control of thistles and black-bindweed
 
LOW DOSE PROGRAMME
Compatibility
DOW SHIELD 400 at 0.25 litre in 80 to 100 litres of water per hectare may be applied as part of the sequential low dose programme with the following products:
Goltix Flowable + Cropspray 11E
Minimum Crop Size:First true leaves 10 mm long 
Notes:Improves control of thistles and black-bindweed

DOW SHIELD 400 can be included once at any stage of the programme with the other herbicides provided the products are used according to manufacturers’ instructions. To complete control of creeping thistle a second application of DOW SHIELD 400 alone at 0.5 litre/ha in 200 to 250 litres of water per hectare should be made 3 to 4 weeks later.

CONTROL OF VOLUNTEER POTATO
DOW SHIELD 400, when used for the control of volunteer potato will give good stunting and loss of vigour to the potato. The control of green foliage will not be complete but the reduction in vigour will significantly reduce the competitive threat posed to the crop from this weed. As well as the reduction in vigour there can be a substantial reduction in number and weight of any daughter tubers that are produced. Any daughter tubers that are formed by a potato plant subsequent to the application of DOW SHIELD 400 can have reduced viability and loss of vigour.

Reduction or partial control of volunteer potato can be achieved by the use of Betanal Flow + Nortron Flo + DOW SHIELD 400 at 1.75 + 0.6 + 0.25 litres/ha respectively as a two spray programme.

Timing
The application timing of DOW SHIELD 400 is dependent upon the size of the potato. For best results it is recommended that the following timings are adhered to: The first application should be made when the volunteer potato shoots are between 5 and 10 cm tall providing the sugar beet crop is at the sizes stated above. The second application should then be made when the volunteer potato is between 10 and 20 cm tall. The size of potato for this second application is that of an untreated potato, for an accurate guide to when this stage is reached it is advisable to leave a small area of untreated potato in the field. Typically the second application will be 7 to 14 days after the first. Applications of DOW SHIELD 400 should in all cases be completed before the end of June. When applying DOW SHIELD 400 for the control of volunteer potato the total amount applied to the crop should not exceed 0.5 litre/ha (i.e. 2 applications of 0.25 litre/ha).

Note
Varieties of potatoes with particularly vigorous growth habits exhibit reduced sensitivity to DOW SHIELD 400 thus results may be less reliable than on other less vigorous varieties.

BRASSICA CROPS
DOW SHIELD 400 may be applied to all types and varieties of cabbage, broccoli, calabrese, Brussels sprouts, cauliflower, swede and turnip in the spring. For the control of annual weeds apply DOW SHIELD 400 at 0.25 litre in 200 to 250 litres of water per hectare. For the control of creeping thistle apply DOW SHIELD 400 at 0.25 litre/ha for the first application at the rosette stage, followed by a second application three to four weeks later of 0.5 litre in 200 to 250 litres of water per hectare. Application should only be made to direct drilled brassica crops after they have reached the two true leaf expanded stage. Transplanted crops can be treated once they are growing strongly and are fully established. Some chlorosis or leaf distortion may occur in crops with a reduced coating of leaf wax (e.g. due to soil acidity).

Compatibility
DOW SHIELD 400 when used at 0.5 litre/ha should not be tank mixed for use on any brassica crop. Do not use DOW SHIELD 400 in any tank mixture on early varieties of F1 hybrid Brussels sprouts.

ONIONS
DOW SHIELD 400 may be applied to spring or autumn sown bulb onions in the spring. For annual weeds apply 0.25 litre in 200 to 250 litres of water per hectare. For the control of creeping thistle apply DOW SHIELD 400 at 0.25 litre/ha for the first application followed by a second application three to four weeks later of 0.5 litre in 200 to 250 litres of water per hectare. DOW SHIELD 400 at 0.25 litre/ha should only be applied to onions after they have reached the two true leaf stage. Extreme caution must be taken when applying DOW SHIELD 400 to onions particularly at the higher rate. The possibility of crop effects (chlorosis, leaf distortion and/or leaf prostration) will be reduced by observing the following: DOW SHIELD 400 should only be applied to onions which have an adequate wax layer. Certain conditions will reduce the layer of protective wax; these include previous chemical applications, drought stress, periods of low night/high day temperatures or rapid growth caused by high nitrogen regimes and irrigation, etc. Do not apply DOW SHIELD 400 to onions at temperatures above 20°C or when under stress.

FORAGE MAIZE
DOW SHIELD 400 can be applied to all varieties of forage maize after the three leaf expanded stage. For annual weeds apply 0.25 litre in 200 to 250 litres of water per hectare.

GRASSLAND
DOW SHIELD 400 can be applied to all species and varieties of grass in established leys or permanent pastures following removal of any livestock. As an overall treatment, DOW SHIELD 400 should be applied at 0.5 litre/ha in a water volume of 300 to 400 litres/ha. Application should be made when weeds are actively growing at the 15 to 30 cm rosette stage. If grass has been cut for hay or silage, treat at least 2 to 3 weeks after cutting when sufficient regrowth has occurred.

NOTE
A 7 day period must elapse between the application of DOW SHIELD 400 and the reintroduction of livestock, or the cutting for hay or silage.

LINSEED FOR OIL
DOW SHIELD 400 can be applied to all varieties of linseed in the spring from the two leaf expanded stage but before the flower buds are visible. For the control of annual weeds apply 0.25 litre in 200 to 250 litres of water per hectare.

CEREALS (WINTER AND SPRING WHEAT, BARLEY, OATS)
DOW SHIELD 400 at 0.175 litre/ha added to Starane 2 will improve control of corn marigold, groundsel, pineappleweed, scented mayweed, scentless mayweed and smooth sow-thistle. Recommended water volume is 200 litres/ha. DOW SHIELD 400 can be applied in the spring from the 2 leaf stage (Zadoks 12) up to and including the second node detectable stage (Zadoks 32).

ORNAMENTAL PLANT PRODUCTION
DOW SHIELD 400 can be applied as a directed spray on ornamental trees and shrubs, but all spray or drift contact with leaves, buds, suckers, or green stems of the crop must be avoided using a shielded or hooded sprayer if necessary. Do not apply DOW SHIELD 400 within the root zone of species of the family Compositae (e.g. Senecio spp.) or Papilionaceae (e.g. Laburnum, Genista, Cytisus spp.). Apply DOW SHIELD 400 at 0.5 litre in 200 litres of water per hectare at the optimum time for control of target weeds (creeping thistle at the rosette stage up to 30 cm across).

COMPATIBILITY
For the latest advice on tank mixes please contact Dow AgroSciences.

TRADEMARK ACKNOWLEDGEMENTS
DOW SHIELD is a registered trademark of The Dow Chemical Company. STARANE is a trademark of Dow AgroSciences LLC. Betanal, Goltix and Nortron are trademarks of Bayer CropScience. Cropspray 11E is a trademark of British Petroleum.

 

Registered for culturesRateBBCHPreharvest Interval
Winter rape0.5 l0
Spring rape0.5 l0
Winter flax0.25 l0
Spring flax0.25 l0
Sugar beets0.5 l39
Red beet0.5 l39
Beets0.5 l39
Mangels0.5 l39
Rutabagas0.5 l39
Turnips0.5 l39
Onions0.5 l042
Cabbage0.5 l042
Broccoli0.5 l042
Cauliflower0.5 l042
Brussels sprouts0.5 l19
Corn0.25 l19
Grassland0.5 l07
Winter wheat0.175 l0
Spring wheat0.175 l0
Spring barley0.175 l0
Winter barley0.175 l0
Spring oats0.175 l0
Winter oats0.175 l0