Epiphytic microflora: the balloon print isolation technique.

@article{Rusch1968EpiphyticMT,
  title={Epiphytic microflora: the balloon print isolation technique.},
  author={V. Rusch and Clay Leben},
  journal={Canadian journal of microbiology},
  year={1968},
  volume={14 4},
  pages={
          486-7
        }
}
A plant part is pressed on a sterile rubber balloon, which is inflated and then pressed on hardened agar in large plates.