Publications for:

pest = Xanthomonas (genus)
crop = Watermelon/colocynth (Citrullus)

found 2 publications:

2013

A new report of Xanthomonas cucurbitae causing bacterial leaf spot of watermelon in Georgia, USA
Plant Disease (2013) 97 (4), p. 556
publishers website - pestinfo wiki

2009

First report of Xanthomonas cucurbitae causing bacterial leaf spot of watermelon in the Seychelles
Plant Disease (2009) 93 (6), p.671
publishers website - pestinfo wiki