Barclay D-Quat

Barclay Chemicals
Registered until
Registration expired
Registration number
Active materials

Contains 200 g/l (16.7% w/w) diquat as the dibromide salt in a soluble concentrate.
For the desiccation of potato haulm, linseed, oilseed rape, peas harvested dry, field beans and weed growth in lodged barley and oats destined for stock feeding; for weed control in potatoes and all outdoor edible and non-edible crops (pre-emergence).

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 Meterological Office Rainfall and Evaporation Calculation System and should be used to identify periods of high soil moisture stress. MORECS gives a calculated Soil Moisture Defecit (SMD).
Barclay D-Quat MUST NOT be applied when Soil Moisture Deficits (SMD) are 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.

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.

Potato varieties
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.

Use of wetters or other adjuvants
DO NOT add a wetter or other adjuvant for the desiccation of potato haulm.

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.

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 crop effectiveness.

Half fill the spray tank with clean water (clean water is essential) 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.
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 safely.

Application (BCPC definitions)
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.
Take extreme care to avoid spray drift. Do not leave mixed spray standing in the spray tank for long periods e.g. over mealtimes.
Do not use with a knapsack sprayer.

Weed resistance
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.

Care of sprayer
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.

Registered for culturesRate
Potatoes4 l
Peas3 l
Beans3 l
Winter flax3 l
Spring flax3 l
Winter rape3 l
Spring rape3 l
Spring barley4 l
Winter barley4 l
Spring oats4 l
Winter oats4 l
Potatoes2 l