October 8, 2005
From: Agrarian Marketing Project website [in Russian; translated & edited]
<http://www.lol.org.ua/rus/showart.php?id=3D29377&theme=3DVegetables>

Leaf spot disease of cabbage by Xanthomonas campestris pv. armoraciae, Odessa region, Ukraine

According to Valentine Kotsur, agriculturist in the Odessa office of the Project of Agrarian Marketing, leaf spot disease caused by _Xanthomonas campestris_ pv. _armoraciae_ on late white cabbage and cauliflower has been
observed in farms in southern and central Ukraine. One feature of this disease is rapid leaf shrinkage, and it results in crop shortages, reduction in quality of the cabbage head, and sometimes complete destruction of a plant. Additionally, affected cabbages do not store well.

The disease is transferred through infected seed and plant material as well as through infected soil; therefore crop rotation is of special value. High humidity and damage by insects contribute to the progress of the disease. It is difficult to combat cabbage leaf spot disease, as the majority of [chemical sprays] cannot kill bacteria. It is more effective to use preventive measures, including preparations containing copper. Spread from affected fields in vegetable-growing areas can lead to decreased yields of late cabbage.

--
ProMED-mail
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[_Xanthomonas campestris_ pv. _armoraciae_ [Xpa] is also present in the USA, Australia, Japan, Brazil, China, Turkey, and India. The disease is favored by cool temperatures in fall and winter, although it infects susceptible hosts over a wide temperature range. Infected plant debris is a source of inoculum and Xpa is known to be soil- and seed-borne. Disease management involves use of bacteria-free seed, planting in well-drained soils, and rotation of non-cruciferous crops on a 3-year cycle. Apparently there are no tolerant or resistant cultivars. - Mod.DH]

[see also in the archive:
2003
Cabbage leaf spot - USA (Florida) 20030712.1713]