Another novel technique is cloud seeding, either by artificial means or through the action of cloud-seeding bacteria that live on vegetation (e.g. Pseudomonas syringae).
Certain bacteria, notably Pseudomonas syringae, produce specialized proteins that serve as potent ice nucleators, which they use to force ice formation on the surface of various fruits and plants at about −2 °C.
Psa or "Pseudomonas syringae actinidiae" was first identified in Japan in the 1980s.
Pseudomonas aeruginosa | Pseudomonas | Pseudomonas syringae | Pseudomonas fluorescens | Pseudomonas putida |