Valdor® Flex is a residual herbicide for pre- & early post-emergence application. It controls a broad spectrum of annual and perennial broad-leaved weeds and grasses on natural surfaces not intended to bear vegetation, permeable surfaces overlying soil, and hard surfaces (railway ballast only). It can be applied once per year at a rate of 0.5 kg/ha.
|Product Name||Valdor® Flex|
|Active Substances||Diflufenican and Iodosulfuron-methyl-sodium|
|Formulation||Water dispersible granule|
|Areas of Use||Natural surfaces not intended to bear vegetation, permeable surfaces overlying soil, hard surfaces (railway ballast only)|
|Mode of Action Group||Inhibition of pigment synthesis and Inhibition of ALS|
|Phytomobility||Residual, Acropetal and Systemic Penetrant|
Valdor® Flex should be applied pre– or early post-emergence of the plant species to be controlled. The combination of the two active substances in Valdor® Flex delivers two modes of control.
The active substances in Valdor® Flex move through the plant systemically, enabling the control of young plants that are present at the time of spraying. They also provide residual activity, creating a barrier at the soil surface which is effective for up to four months. This ensure a long lasting, weed free environment.
If larger weeds are present, Valdor® Flex can be applied with glyphosate or a fatty acid to achieve control of the existing vegetation.
|The Valdor® Flex Barrier|
|Weed Growth With the Valdor® Flex Barrier||Weed Growth Without the Valdor® Flex Barrier|
Valdor® Flex gives pre– and early post-emergence weed control up to the two leaf stage of annual and perennial broadleaved plants and grasses. It will not control deep rooted perennial plants such as dandelion, thistle or nettles once they are established.
A selection of the plant species that are controlled by Valdor® Flex are listed below (please read the label for the full species list):
|Grasses||Annual Herbs||Perennial Herbs||Woody Plants|
|Annual meadow-grass (Poa annua)
Cocksfoot (Dactylis glomerata)
|Bristly ox-tongue (Picris echioides)
Dove’s foot crane-bill (Geranium molle)
Common groundsel (Senecio vulgaris)
Hairy bitter cress (Cardamine hirsuta)
Knotgrass (Polygonum aviculare)
Mayweeds (Matricaria spp.)
Shepherd’s purse (Capsella bursa-pastoris)
|Black medick (Medicago lupulina)
Dandelion (Taraxacum officinale)
White clover (Trifolium repens)
Greater plantain (Plantago major)
Ribwort plantain (Plantago lanceolata)
Persian speedwell (Veronica persica)
Rosebay willowherb (Chamerion angustifolium)
Yarrow (Achillea millefolium)
|Cinquefoil (Potentilla fruticosa)|
Where to use:
When to use: Apply pre- or early post-emergence of weeds (up to the 2 leaf stage) between February and the end of June.
|Maximum Treatments||Application Rate||Water Volume||Application Method||Spray Quality|
|1 per annum||0.5 kg/ha||300 - 500 L/ha||Conventional hydraulic sprayer
Vehicle mounted sprayer
Bio-Chemical Mode of Action: Diflufenican belongs to the inhibition of pigment synthesis group of herbicides.
Pigment inhibitors work by interfering with pigment production, leaving the chlorophyll unprotected from sunlight. As a result, the cell contents are destroyed rapidly.
Mobility: Diflufenican is a residual herbicide with xylem mobile activity which means that as susceptible plants come into contact with the active substance, it is absorbed through the leaves and roots then moves upwards through the plant within the xylem (water conducting tissues).
Application timing: Pigment inhibitors should be applied pre– or early post-emergence. If applied post-emergence, they are most effective when target plants are small.
Bio-Chemical Mode of Action: Iodosulfuron-methyl-sodium belongs to the ALS (Acetolactate Synthase) Inhibitors group of herbicides.
Acetolactate synthase is an important enzyme involved in the biosynthesis of branched-chain amino acids. ALS inhibitors interrupt this process causing the plant to initially become chlorotic before necrosis of plant tissues followed by whole plant death occurs.
Mobility: Iodosulfuron-methyl-sodium is a residual herbicide with xylem and phloem mobile activity which means that as susceptible plants come into contact with the active substance, it is absorbed through the leaves and roots then moves to areas of new growth within the xylem (water conducting tissues) or phloem (sugar conducting tissues).
Application timing: ALS inhibitors are best applied when the weeds are actively growing. They are more effective when target plants are young and in their vegetative phases.
Putting Valdor® Flex to the test on a heavily weeded gravel site at an international airport was a chance to find out if it would live up to expectations. Long-lasting residual control and ability to minimise resistance were two qualities we were looking for in the product, and we were very impressed by both aspects.
Herbicide resistance is becoming a real issue in the amenity sector, so the fact the product brings new chemistry to our armoury is key. We also found it was particularly clean and easy to work with. There was no foaming in the tank, so the job was swiftly completed.
In this trial we combined Valdor® Flex with glyphosate due to size of the weeds.
Complete Weed Control South and Central Wales
For further information on Valdor® Flex, please contact a member of our technical sales team on 01902 440250.