They are mostly disease-resistant and tolerate urban pollution. Complications might occur like Root rot nematodes which are tiny,soil-dwelling worms that feed on a tree’s roots. Their feeding causes the ginkgo roots to form galls that prevent the roots from absorbing water and nutrients. All you can do is to start managing sick ginkgo trees by adding compost or peat to the soil to help the trees process nutrients. If they become badly infected, you’ll have to remove and destroy them. Phytophthora soil-borne pathogens can cause a tree to die within a few years if not treated by a fungicide. Very few bugs on ginkgo trees can be found but occasionally foliage eating cicada, caterpillars, like loopers, attack them. These ravenous eaters have been known to chew through the tender leaf leaving just the veins, known as skeletonization. This feeding habit may result in defoliation, dieback, and possible death, especially if the infestation is severe. Luckily, this is rare and most random caterpillars can be hand plucked from the tree. Also, natural predators, such as lacewings and assassin bugs,can be released to naturally manage these ginkgo pests.