Brother I think you should perform phylogenetic analysis by comparing 16S rRNA sequence to make sure either it is Xanthomonas axonopodis or not. 

Hi: You can judged from the color, if you want to pre conform it you should do the pathogenicity test on the same host that you isolate this bacteria first time.

If you got the same symptoms that will give you an idea whit is it.

This is some paper may help

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3279810/

http://www.ajpcr.com/Vol5Suppl1/789.pdf

http://www.als-journal.com/235-15/

https://www.academia.edu/3832327/MORPHOLOGICAL_AND_BIOCHEMICAL_CHARACTERIZATION_OF_Xanthomonas_campestris_PAMMEL_DAWSON_PV._SESAMI_AND_ITS_MANAGEMENT_BY_BACTERIAL_ANTAGONISTS

http://www.microbiologyresearch.org/docserver/fulltext/ijsem/34/1/ijs-34-1-77.pdf?expires=1490112836&id=id&accname=sgid025581&checksum=F4EDC04A7FF127BAA2BEFC34439F5904

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Hi Muhammed

You can read this reference 1

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&cad=rja&uact=8&ved=0ahUKEwixu4n8wejSAhXya5oKHdkRCGwQFgg-MAg&url=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2F242343082_fig1_Figure-1-Xanthomonas-axonopodis-pv-punicae-colonies-a-and-the-symptom-produced-by-it&usg=AFQjCNHPKwHyKE1wC0aXeFM0DW4ncaqEQw&sig2=VBK9uhdr9dVvCwn5XHx9Fw

2

https://www.cabi.org/isc/datasheet/56962

3

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1082538/

4

https://www.als-journal.com/145-14-flra/

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5

https://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-15372013000400003

The picture quality is not very good. It´s look like there is contaminated with another bacteria.

Maybe, if you take another picture without the cover plate, it will be good and easy to see.

Use host indicators and complete the Koch's postulate.