Survey on Clavibacter michiganensis subsp. sepedonicus in Czech Republic
The first outbreaks of Clavibacter michiganensis subsp. sepedonicus (EPPO A2 quarantine pest) were found in 12 samples of Czech seed potatoes (out of 184 tested samples) collected from the 1995 harvest (see EPPO RS 96/186). Previously, 68 seed potatoes samples from 1993 harvest and 159 seed potato samples from 1994 harvest had respectively been tested but the disease was not found. Since 1996, an official eradication programme has been implemented in Czech Republic. The IF test is used as the official screening test, and if a positive result is obtained, IF is followed by a biological test.
Results of the 1996-1999 surveys are as follows:
1) ; ; ; ;Percentage of positive samples of seed potatoes: 0.24 % for 1996 harvest (on a total of 1653 tested samples), 0.81 % for 1997 harvest (3464 tested samples), 1.14 % for 1998 harvest (3236 tested samples), and 0.73 % in 1999 harvest (3427 tested samples). Since 1997, all seed potatoes are tested.
2) ; ; ; ;Percentages of positive samples of ware potatoes: 10.61 % in 1996 (on a total of 66 tested samples), 7.36 % in 1997 (462 tested samples), 7.30 % in 1998 (1726 tested samples) and 8.23 % in 1999 (2841 tested samples).
The situation of C. michiganensis subsp. sepedonicus in Czech Republic can be described as follows: Present only in some areas where potatoes are grown, under eradication.
Sources
NPPO of CZ, 2001-09.