Rating General Resistance on a Single-Plant Basis

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Abstract
A method of rating single plants for general resistance was devised which directly compares, over time, the relative amount of disease on a single plant with all other plants in the test. The method is simple and rapid and was reproducible between 2 yr and among 7 judges. It involves taking notes many times (7-14) throughout the disease cycle on the basis of S = standard for the most disease as observed from a standing position on each day notes are taken, and L = less than standard. The number of times during the season that a plant is rated S is the disease index. If the ratings obtained with the method correlate with relative disease incidence in populations, it would make possible selecting for general resistance on a single-plant basis in a breeding program.

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