. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. 122 SCIENTIFIC AGRICULTURE March, 1921. The Immunization of Plants G. v. McROSTIE, , Associate Professor of Cereal Husbandry, Macdonahl College, The term immunization is used in this paper as mean- ing the changing of the nature of an individual plant in such a way that it is no longer susceptible to a given pa- thogene. The application of the principle of immuniza- tion probably offens the ideal method of disease con- trol but unfortunately our present knowledge of the best means of br
. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. 122 SCIENTIFIC AGRICULTURE March, 1921. The Immunization of Plants G. v. McROSTIE, , Associate Professor of Cereal Husbandry, Macdonahl College, The term immunization is used in this paper as mean- ing the changing of the nature of an individual plant in such a way that it is no longer susceptible to a given pa- thogene. The application of the principle of immuniza- tion probably offens the ideal method of disease con- trol but unfortunately our present knowledge of the best means of bringing alxint such a desirable condition is as yet rather unsatisfactory. In speaking of immuniza- tion in plants it is necessary for us to keep in mind that actual immunity very seldom exists in the plant world. What expresses nearer the truth and is now more com- monly used is the term resistance. This latter term is used to express the ability of a plant to develoi> and function normally under conditions such that other plants of the same species would fail to develop or be destroyed. The whole problem of the immunization of plants may be considered from two standixiints. First, arti- ficial immunization obtained by introducing into the host certain chemical elements oi- compounds, and se- ond, natural innnunization by tlie isolation of resis- tant individuals by straight selection or by hybridiza- tion followed by selection. Research on the first phase of this problem has been considerably stimulated by the success that has follow- ed the use of anti toxins for the prevention of animal diseases. Many attempts to treat plants in a similar manner have been macle, usually without due recogni- tion of the totally different structure and mode of life of plants and animals. It is to be expected that due to the crudeness of the methods employed the majority of attempts to immunize plants by artificial means have failed. The problem, however, offers an interesting and profitable
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