Abstract:1. Experimental infections with virus S on a number of varieties showed that serological tests performed on the plant failed to prove a new infection with certainty. Such new infection remains symptomless, while invasion of the tuber proceeds relatively rapidly. 2. During the last three years 67 varieties were tested : 22.4 percent were found to be of low, 47.8 percent of medium, and 29.8 percent of high resistance. 3. The rate of tuber contamination of a primary infected plant increased from resistance stage … Show more
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