Recently the temperature in summer more and more frequently falls below freezing. Mediterranean plants are not adapted to this. The ice crystals are formed and destroy plant tissue on the leaf surface at temperatures close to zero. Microbiologists from Colorado and California universities have found out that the centers of crystal formation are bacteria! If you remove the bacteria of the species Erwina herbicola and Pseudomonas virina from the surface of the leaves, the plants will survive the temperature to -6С without any losses. And how can they be cleaned without harm to the plant? Are there even smaller objects that can act solely on these bacteria without harming anyone else? Yes! Scientists have identified special viruses that will help preserve the harvest of oranges and billions of dollars.