USING THE RIGHT SPRAY VOLUME IS VITAL

Using the right spray volume is essential to ensure acceptable control. Applying too much is wasteful, and applying too little can mean having to go back to re-treat large amounts of regrowth. Always read the label for the application rate and critical comments.

Use the calibration charts below as a guide to the correct foliar spray volume you should be applying to a woody weed.

CALIBRATION CHART FOR DOME-SHAPED WEEDS

Recommended volume for dome-shaped weeds such as blackberry and gorse:

CALIBRATION CHART FOR DOME-SHAPED WEEDS
Source: Max McMillan

CALIBRATION CHART FOR CYLINDRICAL/CONE-SHAPED WEEDS

Recommended volume for cylindrical/cone-shaped weeds such as sweet briar, lantana, wattle and eucalypt regrowth:

CALIBRATION CHART FOR CYLINDRICAL/CONESHAPED WEEDS
Source: Max McMillan

ADJUVANTS

Grazon™ Extra, Garlon™ 600, Hotshot™ and Starane™ Advanced formulations already contain surfactants. The use of additional surfactants is not recommended except in specific situations as detailed on the label.

RAINFASTNESS

Grazon™ Extra, Garlon™ 600, Hotshot™ and Starane™ Advanced are rainfast. Foliar application should be stopped if rain is likely within one hour or if foliage is wet. Amine 625 and Ripper™ 480 are relatively rainfast; foliar application should be stopped if rain is likely within six hours.

CALIBRATION CHART FOR CYLINDRICAL/CONESHAPED WEEDS CALIBRATION CHART FOR CYLINDRICAL/CONESHAPED WEEDS CALIBRATION CHART FOR CYLINDRICAL/CONESHAPED WEEDS

Prior to spraying, select a bush to spray and decide what shape the weed can be categorised as (either dome or cylindrical). Spray that bush normally to achieve good coverage to the point of run-off. Time how long it took you to spray. Repeat this process spraying into a bucket. Measure the spray volume and compare this with the recommended spray and water rate using the tables attached. Installing a flow meter on the high pressure hose next to the hand gun will make calibration easier.

Reference: Scott, M. and Cook, T. (2007). Spraying Woody Weeds. NSW DPI SMARTtrain Chemical Notes 2