Interaction between clover phyllody and celery-infecting aster yellows causal agents in plants

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Abstract
Interaction tests, using aster (Callistephus chinensis Nees) as the host plant and Macrosteles fascifrons (Stål) as the vector, showed that infection with clover phyllody causal agent (CPCA) did not protect the plant against subsequent infection with a celery-infecting strain of aster yellows causal agent (AYCA), although symptom development was delayed. However, infection with AYCA prevented subsequent infection with CPCA. These interactions indicate that CPCA and AYCA are related. Both causal agents could be recovered from some dually infected plants.

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