| УДК |
Аннотация: Plant diseases are due mainly to the action of fungi, but some are caused by bacteria, a few by plasmodia, while others in which no particulate living organisms have, so far, been discovered, are believed to be due to virus infection. In plant viruses that have been studied in any detail the invisible agent multiplies with great readiness only in the living host from which the virus has been isolated in the form of a nucleoprotein. Other diseases, again, but of a non-parasitic nature, are attributed to physiological or to deficiency troubles, and probably all are influenced by the factors of the environment.
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Jones, S.G.
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