Gibberellic Acid (GA)
Definition - What does Gibberellic Acid (GA) mean?
Gibberellic Acid is used as an application on grape vines, particularly on the grape bunches, prior to bloom. Using Gibberellic Acid helps to minimize the growth of grapes on the clusters from being too compact, as compacted clusters can cause the fruit to rot.
Gibberellic Acid is classified as a pesticide and must only be used when advised and/or approved.
WineFrog explains Gibberellic Acid (GA)
The application of Gibberellic Acid should be done about three weeks prior to bloom time. The spray volume should be a solution with 1 to 10 mg/L of active ingredient and 100-gallons per acre. It is used on winegrapes only when needed, as it can also reduce the number of shoots and clusters which form the following spring.
To avoid this, it is best to only spray the Gibberellic Acid directly on the clusters.
