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A method for selection of potato plants with partial resistance to Phytophthora infestans has been developed in Colombia. Using sexual seed of 6 different potato clones with varying degrees of partial resistance two greenhouse methods of selection were used: 1) individual leaves were inoculated with pads of cotton dipped in a dilute suspension of zoospores and when lesions appeared they were placed in moist chambers. Visual observation of sporulation was started after 3 hours and all clones which sporulated in less than 8 hours were discarded and, 2) plants were inoculated uniformly with a dilute suspension of zoospores, incubated, and after 5 days selections were made visually based on small numbers of lesions and small size of lesions. Tubers were harvested from the selected material and planted in the field with similar material which had been selected for partial resistance in the field under epidemic conditions for late blight. Late blight subsequently developed in the field on this material and an analysis of the results of the test showed: 1) the material selected in the greenhouse had as high a level of partial resistance as the material selected for partial resistance under epidemic conditions in the field; 2) there was no statistically significant difference between the efficiency of the two methods of selection with one exception. [ABSTRACT FROM AUTHOR]

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