The rates of Gramoxone and the spray volume will vary depending on the use. The most commonly used cropping situations are listed here with Gramoxone rates* and water volumes**. For further details, consult the label.
Stale seedbed / spring cleaning: 1.1 - 2.2 L/ac Gramoxone in 30-110 gpa of water
Orchards / Vineyards: 2.2 L/ac Gramoxone in 110 gpa of water
Inter-row weeding: 1.1 - 2.2 L/ac Gramoxone in 30-50 gpa of water
Conservation Tillage: 1.1 - 2.2 L/ac Gramoxone in 20-25 gpa of water
Potato weed control: 1.1 - 1.7 L/ac Gramoxone in 30-50 gpa of water
*Use the high rate when weeds are greater than 5 cm in height.
**Use the higher volume when weed growth is dense for better coverage.
As Gramoxone is a contact herbicide, thorough and uniform spray coverage is essential to obtain good weed control. Plant foliage that is not wetted by the spray solution will not be affected. Water volume recommendations should be followed closely to ensure optimum results. Weeds emerging after application will not be controlled.
It is essential that clean spray water is used when apply Gramoxone. The active ingredient in Gramoxone is rapidly deactivated by soil. The use of muddy spray water reduces its effectiveness.
Gramoxone activity requires the presence of sunlight and the speed of plant kill increases as the light intensity increases. Performance can be enhanced by applying the product under conditions of low light intensity (dull days or in the evening) following by bright light conditions the next day.
Apply after weeds have emerged in the spring but before potatoes emerge beyond the following stages:
For Netted Gem (Idaho Baker, Russet or Burbank) and Cherokee, apply up to ground crack only (potato tops about to emerge).
For other varieties, apply up to the time first potato tops have reached 5-8 cm in height.
Application to exposed or emerged potato foliage will cause temporary injury and chlorosis.
Do not apply to emerged potato foliage in the evening or when potatoes are under moisture stress due to extremely dry soil conditions or to early potatoes.
The use of poor or diseased seed and cut seed with one eye will make potatoes more susceptible to injury from a post-emergence application of Gramoxone.
Fill sprayer 1/4 full of carrier. Start gentle agitation.
Add dry flowable or wettable granule tank-mix partners, if applicable, and agitate thoroughly
Add liquid Gramoxone and continue to agitate thoroughly.
Top off tank with carrier, maintain agitation and spray.
Do not let stand without agitation.
At the end of each spray day, rinse out the tank and sprayer lines with water.