Eggs? Galls? Fungus? None of the above?

Eggs? Galls? Fungus? None of the above?

Observation - Eggs? Galls? Fungus? None of the above? - Global. Description: Each of the spheres is 0.5mm in diameter. They are on a Wisteria leaf. I don't even know what group to put them in!

Each of the spheres is 0.5mm in diameter. They are on a Wisteria leaf. I don't even know what group to put them in!