Question
Do you know if it is possible to treat a female ginkgo tree to prevent flowering and avoid the fruits?

Answer
No not really. Most experts say that the smell from the fruit can be avoided IF the fruit is collected when it drops to the ground.(the rotting of the fruit is when they smell). Here is a site that is all about Ginkgoes: http://www.xs4all.nl/~kwanten/index.htm
Most cities are starting to ban the planting of female ginkgo trees for this smelly reason.