Klassifizierung der Resistenzerscheinungen von Pflanzen gegenüber Schadinsekten

A new classification of resistance of plants to phytophagous insects is presented basing on the fundamental relationships between the plant and the pest. Two kinds of resistance are distinguished, namely an active (antibiosis) and a passive one. The last can be divided into the ecologic resistance and the tolerance. All the three kinds of resistance are subdivided into a horizontal type (variability of resistance in different plant species or sort) and a vertical type (variability of resistance in one plant species) respectively. Each of these two, types again consists on three forms corresponding with the resistance to a certain pest or with a group of pest species or with a whole complex of pests resp. diseases. By marking the types mentioned with the initial letter one can characterize each form of resistance by help of a formula.