Publications for:

pest = Xanthomonas (genus)
crop = Onion/garlic/leek (Allium)

found 2 publications:

2003

First report of a leaf blight of onion caused by Xanthomonas spp. in Georgia
Plant Disease (2003) 87 (6), p. 749
publishers website - pestinfo wiki

2001

Xanthomonas blight of onion in South Africa
Plant Disease (2001) 85 (4), p.442
publishers website - pestinfo wiki