Barclay D-QuatPlant Protection Product ComparisonPlant Protection Product ComparisonReport inaccuraciesReport inaccuracies

Reduces late-season spread of disease
Aids planning and control of harvest timing
Maintains crop quality during storage
A non-residual product, deactivated on contact with soil – D-Quat offers the potato grower reliable, rapid and cost-effective activity
Excellent performance
Rainfast within 15 minutes of application
Reduces time from crop maturity to harvest
Rapid activity
Cost effective

200g/l Diquat dibromide salt (16.7% w/w)

Soluble concentrate

2 – 5 L/ha

200 – 500 L/ha

Depends on crop/situation. See product label

Apply as a MEDIUM spray at 2-3 bar (30-45 psi) by conventional hydraulic ground-operated sprayer.

 

 DIRECTIONS FOR USE

 

Cultural considerations: Desiccate the haulm when the tubers have grown to the required size or upon other management criteria being reached

Wait at least 14 days after completion of spraying before lifting to allow the skins to set, most particularly if blight is present.

See SOIL MOISTURE See POTATO VARIETIES.

 

Desiccate the haulm employing either a single spray or two sprays 5-7 days apart. The two spray method may be preferred when the haulm and/or weed growth is dense. Achieve good spray cover of haulm and weeds by ensuring accurate spraying machine set-up and by employing a spray volume matched to the density of the vegetation. Ideally spray under bright conditions with low humidity. DO NOT spray if light rain, mist or heavy dew is present or expected as this may cause cropdamage.

Spray evenly over the crop and weeds when all conditions are judged suitable.

Apply the first spray when all conditions are judged suitable with the aim of causing substantial dieback of the haulm. Use a higher dose where the crop is more vigorous or has yet to start senescing.

Apply the second spray about 5-7 days after the first spray when substantial haulm dieback should have occurred thus allowing more complete penetration of the second spray to the lower stem surfaces.

 

DO NOT add any wetting agent or other adjuvant to any spray

4 litres in 200-400 litres water/ha

1-2 litres in at least 200 litres water/ha.

2-4 litres in at least 200 litres water/ha.

The total dose must not exceed 5 L/ha per year.

 

 SOIL MOISTURE

Desiccation of potatoes whilst under moisture stress may cause tuber damage primarily observed as a brown staining of the vascular ring, commonly referred to as "ringing", just below the skin.

MORECS is the Meteorological Office Rainfall and Evaporation Calculation System and should be used to identify periods of high soil moisture stress.  MORECS gives a calculated Soil Moisture Deficit (SMD).

Barclay D-Quat MUST NOT be applied with Soil Moisture Deficits (SMD) in excess of those in the following table unless the specified amounts of rain or irrigation have been received or applied within the specified time scale.

 

Early or seed crop:32 mm

Canning crop:Do not use.

Ware crop*:50 mm

 

Early or seed crop:50 mm

Canning crop:Do not use.

Ware crop*:64 mm

 

Early or seed crop:64 m

Canning crop:50 m

Ware crop*:83mm

 

* If ware crops are immature or show excess vigour at the time of spraying, treat them as though an Early/Seed Crop.

 

Before any or each application of Barclay D-Quat all areas of the field must be physically examined and the soil must be judged as moist before the treatment may be applied.  The soil may be judged moist and the crop suitable for treatment if the soil within 5 cm of all tubers, including the deepest tubers, is moist. Seek professional advice in cases of doubt.

 

The haulm of all varieties of potato may be desiccated with Barclay D-Quat, but it is important to ensure that the conditions specified under SOIL MOISTURE are followed when treating any variety, especially the less drought tolerant varieties. Varieties in the NIAB listings of potato varieties with a drought tolerance rating of 5 or below are at most risk of vascular discoloration.

 

DO NOT add a wetter or other adjuvant for the desiccation of potato haulm. This product is to be used only in accordance with the Directions for Use and instructions given on the label provided with this pack. Use in any other circumstances is entirely at user’s risk.

 

Important: Crops must be at the recommended stage of maturity at the time of treatment as desiccation does not advance maturity, but acts as a harvesting aid only. Desiccation too early may lead to pinched samples of low specific weights and reduced germination.

 

Treatment of uneven, diseased or thin crops is not recommended, especially if grown in exposed fields, as losses due to shattering may be excessive.

Direct combine the crop 7-14 days after spraying as soon as the seed moisture content is 12-15%.

Desiccate when 90% of the pods in the middle section of the stem of erect crops are yellow and the seed within is reddish/dark brown. The seed of the lower pods will appear dark brown/black, whilst the seed of the uppermost pods will be turning in colour with up to half the seeds still of green appearance. If the crop is leaning, desiccate when the seed in the exposed surface pods is reddish/dark brown and the seed in the majority of the underlying pods is turning in colour.

Correct timing is essential for best results; premature desiccation may reduce yield and sample quality, whilst delayed desiccation may lead to excessive pod shatter. Spray once only and achieve good cover of the pods

3 l/ha in 200-500 l/ha water.

Add an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

Use higher water volumes for dense growth, in particular tall or lodged crops.

 

Correct timing is essential for best results; premature desiccation may reduce yield and sample quality and/or lead to collapse of the haulm, whilst desiccation too late may annul the timeliness advantages of desiccation and add to the risk of shattering of the earliest pods.

Desiccate when the crop is mature with an overall seed moisture content of less than 45%.  At this stage the pods in the middle section of the stem are yellow and the seed within is firm, whilst the upper pods are beginning to dry out or to turn yellow and the seed within splits under light finger pressure. Bottom pods are yellow/brown with seeds within quitehard.

Spray once only and achieve good cover of the haulm. Direct combine 7-10 days after spraying.

Average conditions: 2 l/ha

Dense or weedy crops: 3 l/ha

Apply in 200-500 l/ha water.

For peas for processing for human consumption consult your processor before adding any wetter or adjuvant

Treated haulm may be fed to livestock from 4 days after spraying.

 

Desiccate when the crop is mature and the pods are brown/black and leathery.  Direct combine 7-10 days later.

3 l/ha in 200-500 l/ha water.

Add an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

 

Spray when the crop is normally mature for combining. Combine as soon as practicable after complete desiccation, provided that 4 days have elapsed since spraying. Delay in harvesting may result in re-growth of grass weeds.

Most situations:

3 l/ha

Dense weed growth or when cleavers or common couch are dominant:

4 l/ha

Apply in 200-500 l/ha water with an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

Treated grain and straw may be safely fed to livestock from 4 days after spraying.

TREATED BARLEY AND OATS must be used for stock feed only.

 

Desiccate when 95% of the capsules are brown and the seed is loose within. Direct combine 10-20 days after spraying when seed moisture is below 14%. Always use a sharp knife on the combine and cut the crop as high as possible; just below the level of branching of the capsule clusters of the shortest stems. Aim to combine in bright sunny conditions, or when there is a drying wind.

3 l/ha

Apply in 300-500 l/ha water with an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

 

Spray evenly over the crop and weeds when the crop is judged about mature for harvesting. Combine harvest as soon as practicable after complete desiccation, normally about 3 days after application.

2-3 l/ha

Apply in 200-500 l/ha water with an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

2l/ha may be used on less dense crops

Clover straw and trash may be fed to livestock from 4 days after spraying.

 

To control certain annual weeds, listed below, at up to their 4 true-leaves stage:

Chickweed, common

Situation:To control listed weeds, pre- emergence or pre-planting of sugar beet.

Timing, cultural & spraying recommendations:

Rate of application:2l/ha in 200-500 l/ha water with an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

 

Situation:To control listed weeds in ornamental bulbs.

Timing, cultural & spraying recommendations:Spray whilst the shoots are 12 mm below the soil surface.  Do not use on SANDS*.

Rate of application:2l/ha in 200-500 l/ha water with an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

 

Situation:To control listed weeds around any edible or non-edible crop.

Timing, cultural & spraying recommendations:

Rate of application:2l/ha in 200-500 l/ha water with an authorised alcohol ethoxylate adjuvant (not an organo silicone) at its recommended rate.

 

This product is to be used only in accordance with the Directions for Use and instructions given on the label provided with this pack. Use in any other circumstances is entirely at the risk of the user.

 

Barclay D-Quat is rainfast within 15 minutes of application; rainfall after this period will not reduce effectiveness.

 

Half fill the spray tank with clean water and start the re-circulation system. Pour the required quantity of Barclay D-Quat into the spray tank.  Top up the spray tank with more clean water to the required level. Agitate thoroughly before use.

 

Apply as a MEDIUM spray at 2-3 bar (30-45 psi) by conventional hydraulic ground-operated sprayer. Operate equipment to achieve maximum spray cover of the intended target crop and/or weeds. DO NOT apply through ultra low volume (ULVA) or mistblower equipment.  - Extreme care should be taken to avoid spray drift.  Do not leave mixed spray standing in the spray tank for long periods

e.g. over mealtimes.

 

Diquat is a bipyridilium group herbicide. Strains of annual meadow-grass and American willowherb resistant to bipyridilium herbicides have been found in top and soft fruit orchards. Barclay D-Quat may not give full control of these weeds where such resistant strains of weeds occur.

 

Immediately after each days use with Barclay D-Quat, wash out the sprayer thoroughly with clean water and a wetting agent recommended for the cleaning of sprayers, according to standard cleaning procedures.