General Information



NOTE: Gibberellic Acid is an extremely potent plant growth regulator. For best results, read all directions for use thoroughly. Consult your local experiment station specialist, distributor, or the Nufarm agricultural specialist in your area for the spray schedule best suited to your conditions.

Discard any unused spray material at the end of each day. Prepare solution concentrations by mixing the required amount of product with water only in a clean, empty spray tank. Refer to individual crop sections and rate conversion tables provided in the labeling for the amount of GIBGRO 4LS to be applied.

Use only as directed. The label must be read thoroughly and understood before making applications. Effectiveness requires that all parts of plant or crop must receive spray or desired result will not occur, so spray thoroughly. When a range of rates is indicated, use the concentration and spray volume recommended locally.

Data concerning the compatibility of GIBGRO 4LS with other agricultural compounds is not available, except where specified.


To assure the compatibility of GIBGRO 4LS with other products, pour the products into a small container of water in the correct proportions.

After thorough mixing, let stand for 5 minutes. If the combination remains mixed, or can be remixed readily, the mixture is compatible.

Limitations, Restrictions, and Exceptions


All states except California.

To maintain and extend high fruiting capacity of bearing tart cherry trees and reduce occurrence of “blind” nodes by stimulating lateral vegetative buds to develop a more productive balance of lateral shoots and spurs: GIBGRO 4LS must be applied annually to ensure vegetative development and subsequent yield improvement year after year.

Timing: Apply a single foliar spray between 14 to 28 days after bloom. Research and commercial experience has determined 21 days after full bloom to be optimum. Best timing is further defined as that stage when three to five terminal leaves have fully expanded, or, at least 1 to 3 inches of terminal shoot extension has occurred.

Concentration: Use 14 to 18 grams a.i. per acre. Apply as a concentrate or dilute spray in sufficient water volume to ensure thorough wetting.

NOTE: Rates of GIBGRO 4LS are based on expected tree vigor at various ages in a normal orchard. Each orchard presents a different situation. Adjust GIBGRO 4LS rate to complement vigor of trees. If trees are vigorous, use lowest rates. Use lower rates on trees that have been heavily pruned or hedged. Do not use additional wetting or spreading agents. Use higher rate for trees low in vigor and weak in shoot and spur production.

Excessive application rates on any tree will increase vegetative growth at the expense of fruit production the following year.

GIBGRO 4LS will not improve growth of trees under stress (nutritional, moisture, winter injury) or other factors inhibiting normal growth and development resulting from physical damage or unsound orchard practices. Best results from GIBGRO 4LS will be obtained when combined with good cultural practices.

Restricted Entry Interval

4 hours

Exception: If the product is soil-injected or soil-incorporated, the Worker Protection Standard, under certain circumstances, allows workers to enter the treated area if there will be no contact with anything that has been treated.