Sixteen isolates from tomato fields in California grown with resistant cultivars were multiplied on resistant tomato in a greenhouse. Of these resistance-breaking isolates, one was identified as , and all others as The reproduction of the isolate and four isolates on six resistant tomato cultivars and on susceptible and resistant cultivars of pepper, sweetpotato, green bean, cotton, and cowpea was evaluated and compared to an avirulent population in greenhouse pot trials. On resistant tomato cultivars, there were minor but significant differences between the resistance-breaking isolates and between the different tomato cultivars. Of the other resistant crop cultivars, pepper was resistant to all isolates and green bean to all isolates, while cotton and cowpea allowed reproduction of one of the resistance-breaking isolates. The resistant sweetpotato cv. Bonita behaved like resistant tomato, allowing reproduction of all five resistance-breaking isolates but not of the avirulent . Our results showed that variability exists among resistance-breaking isolates, and that isolates overcoming resistance in tomato may also be virulent on resistant sweetpotato.
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| http://dx.doi.org/10.2478/jofnem-2023-0043 | DOI Listing |
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