I have found recently yellow-pigmented bacterium that cause canker of Physalis leaves at 25-30oC and rapid blight at 35oC. This bacterium cause no symptoms but colonyze plant leaves at 25oC only. Do you know any similar pathogen?
Hi, Alex, how rapid was HR response? Did this bactreia colonize leaf at lower temperature (18 °C)? I am attching recent list of the possible candidates.
Taras,
Thank you. I found it by excident - transplanted very nice escaped physalis seedling from outdoor (22/10oC day/night, late August) to new glasshouse (>30/20oC) in my garden. It showed severe symptoms in 48h after transplantation. Looks like all leaves carried bacteria. Now all physalis plants around infected one are with symilar symptoms. I will send picture - looks really bad. First stage - canker spots, later it can destroy young leaves - looks like mess of callus tissues, at >35oC - rapid necrosis (blight) and later - rot. Isolation gave 90% of pure type of yellow-pigmented bacteria without EPS. HR is rather slow - like for xanthomonads. Smells like xanthomonas. Produce a little of acid on YDC.
Other plans outdoor are symptoms-free by still carry these bacteria (rain?). July was hot, but I have not seen anything like this. I worry about other solanaceous pants. There are some news about similar symptoms (rapid blight) on potato at July in other regions. Next week I will sequence key genes to know the bacteria name.
Excuse me, it was mixed infection - virus and secondary bacterial pathogen. Spreading of disease on other plants proved it. From initial single spots it became systemic.
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