If you are spraying very large weeds like blackberries that are several years old, ensure that canes on the inside as well as the outside of the foliage mass receive direct contact with the applied spray.Īs a guide, one hectare of blackberries 1–2 metres in height will typically require a spray volume of 3000–4000 litres to be thoroughly covered, whilst the same area of a small herbaceous weed such as ragwort will require 500–1000 litres.Ī video demonstrating the correct techniques for high volume spraying can be accessed here.ġ. With a foliar spray you are looking to capture enough chemical on the foliage to kill not only the above-ground portion of the weed but all of the root mass as well, so good coverage is essential. Provided that good coverage of the target weed is possible, high volume spraying can be completed using a variety of equipment – from a small hand pump unit to a knapsack sprayer through to a large motorised pump and hand gun unit. This type of application is called high volume spraying as you are applying a large amount of spray mixture to the target weeds. Think of painting a wall and use that motion in your spray action to achieve full coverage of the foliage, then use a more directed stream to thoroughly treat the stems and canes. Coverage should be to the point of run-off in that the chemical mix is just beginning to drip from the leaves once the spraying is completed. We recommend that blackberries and other woody weeds not be disturbed for six months after spraying to maximise the performance of Grazon Extra.Īpply as a foliar spot spray to completely wet all leaves and stems. before the chemical is fully distributed will compromise the control achieved. Disturbing the weeds by slashing, burning, mulching, etc. Once the weeds have been sprayed leave them undisturbed so that the chemical is able to move throughout the leaves, stems and roots and provide complete kill. Similarly, avoid application if the leaves are wet from rainfall or dew. Grazon Extra needs to penetrate into the leaves of treated weeds before any rainfall occurs so do not make applications if rain is possible before the spray is completely dry – usually one hour. Actively growing weeds will draw the chemical into the vascular system and transport it through the stems and down to the roots to ensure maximum efficacy.Ī general guide to the best time of the year to treat common woody weeds can be found in this table.

Grazon Extra is most effective when applied to weeds that are not stressed due to lack of moisture, excessive heat, insect or pathogen (such as rust) damage, etc. In general, smaller weeds are easier to control than large ones.

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