Symptoms have appeared as small white spots, rapidly growing and leaves were destroyed in 4-5 days. Rapid systemic spreading was observed as well.
There seems to be no sporulation; I'm betting a bacterial disease. Have you investigated the infected malformed areas under a microscope?
Alex it looks like an enviromental damage...is it Physalis peruaviana?
These symtoms might indicate infection by mites, consult some pesticide supplier and see waht he suggests
I wonder if anybody has observed such symptom.... We have tens of physalis plants in our garden and greenhouse but see such disease for very first time.
@ Moshe, I could not find mites known to me, but will try insecticide.
@Marcin, I believe it is bacterial, and DNA of isolates is under sequencing now. But, it is too strange; this infection came out of the blue, prefers high temperature, symptoms grow very fast, looks like pathogen produce huge amount of plant hormones or transforms host cells. Only small part of spots have developed necroses later at 25oC. No fungi, almost no secondary infection. At 25oC infected plants have even faster growth, but at 35oC – are killed. I had idea that it is virus+bacteria, but it is too fast for virus.
@Sergio, it is Physális philadélphica, but there is a clear infection process - no symptoms before the single infected plant was brought to greenhouse. Symptoms on other plants started from point of contact between infected one and healthy plants, but soon infection became systemic. Fortunately, the putative pathogen was not virulent to other solanaceous and other groups of plants.
These mites are small and difficult to be observed ask someone who is specializing on eryophide mites, These symptoms are the lyoung leaves of Datura stromonium ,
The last sentence was truncated , it should read :These symptoms are often observed
on young leaves of Datura stramonium indicator plants when grown under wet conditions
When you have the DNA extracted, you can use the standard markers to amplify several sequences (rDNA; coxA; actin; etc.) and BLAST the resultant sequence for faster recognition.
Alternatively, you could mince the infected tissue and try those biochemical tests (25+ biochemical markers in one strip, each is a separate reaction). Attached - a googled example, only for visualization.
Marcin,
thank you! I gave sample to parasitologist who will look for mites, and will make MLST after 16S rRNA result for the bacteria. We have rather good collection of MLST primers for many plant pathogenic bacteria. It is still unclear if any virus was present in the plants. Indicator plants gave a few necroses...
The leaves seems to be distorted and with not normal shape. Have you check if there is no damage by herbicides? The distribution of the affected plants may help you to check this hypothesis. If they are located in rows, next to a place where herbicides were applied it may confirm the cause...
Ricardo, no herbicides were applied, and the disease came from a sinlge plant.
Hi Alex,
As far as I could observe in the photo, the symptoms look like virus symptoms. We have had it recently in some Physallis area in Southern Brazil. The ELISA result indicate potato Y virus. However, additional PCR analysis indicated something else that we are studing.
No viruses - confirmed by PCR and/or ELISA against 15 possible candidates.
I have the same disease on physalis plants that I have raised from seed this year. Never seen it before. It has spread to to tomatoes and other solanum spp. I have also raised from seed. Did anybody ever get a definitive diagnosis on this? I haven‘t found any other conclusive examples of this particular pathogen other than this image.
Cody Hinchliff I found it for the first time at summer 2014, and several notes made by gardeners indicated that it was present on physalis in USA and UK since 2011. Now, it is common in commercial greenhouses on tomato and original (breeders) seed potato reproduction in Russia. Disease appears at high temperature only. The most probable version - it is Xanthomonas euvesicatoria pv. physalidis. At least this bacterium was present in the infected potato plants (confirmed by RNA-seq, Ignatov et al. 2021). Srinivasan et al. 1962 described similar disease in India and isolated type strain of X. physalidis. Joana Vicente with colleagues from University of Exeter, UK has sequenced NCPPB 1756 strain recently (2022). We had a plan to study it, but before the current circumstances...
Thank you Alex for that info. Let’s hope the circumstances improve soon.
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