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Dikegulac sodium, or sodium diprogulate, is the sodium salt of dikegulac (diprogulic acid), which is used as a precursor in commercial ascorbic acid production. It a plant growth regulator, primarily used as a branching agent. When it is taken up by a plant, dikegulac sodium is translocated to its apical meristems, where it inhibits DNA synthesis. This suppresses apical dominance in plants and can stimulate lateral branching. Dikegulac sodium is sometimes used to inhibit fruiting and flowering.

Commercial formulations
Commercial formulations available in the United States include Atrimmec, Augeo, and Pinscher.

Application methods
Dikegulac sodium can be applied as a foliar spray or a trunk injection.

Phytotoxicity
Dikegulac sodium application often causes phytotoxic symptoms such as chlorosis and stunted growth. When higher concentrations are applied, there is a greater risk that these adverse effects will persist, leading to crop loss.

Reversing growth inhibition
Gibberellins can be applied to fight growth inhibition following dikegulac sodium application, but success can be limited.

Regulations
Plant protection products containing dikegulac were phased out in the European Union after the European Commission decided in 2002 not to include it in Annex I to Directive 91/414/EEC.

Dikegulac sodium is approved for EPA registration in the United States.

Ginkgo Gate
In Fall 2008, Washington, D.C.'s Urban Forestry Administration failed to suppress the fruiting of thousands of female Ginkgo biloba trees by injecting them with the dikegulac sodium product Pinscher.

Ginkgo biloba is a dioecious plant. The females are well known for their foul smelling fruit, so the non-fruiting males are recommended for landscape use. These city trees were installed before Gingko saplings could easily be sexed, however, so many were female.

The Urban Forestry Administration had previously sprayed the trees with chlorpropham to prevent fruiting, but their success had been limited. When the dikegulac sodium injection failed, the trees dropped their fruit, and some referred to the resulting uproar as "Ginkgo Gate".