Results of 2003 surveys on quarantine pests in Latvia
During 2003, several surveys for different plant quarantine pests were carried out in Latvia (for 2002 results see EPPO RS 2003/119).
Beet necrotic yellow vein benyvirus (rhizomania - EPPO A2 list)
51 samples were collected from 41 beet production farms from a total area of 1397.7 ha. The virus was not found. Absent, confirmed by survey.
Erwinia amylovora (EPPO A2 list)
In total, 125 sites with fireblight host plants (Cotoneaster, Crataegus, Cydonia, Malus, Mespilus, Pyrus, Sorbus) over a total area of 484.3 ha were visually inspected and 149 samples were taken and tested for the presence of the bacterium. E. amylovora was not found. Absent, confirmed by survey.
Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum (both EPPO A2 list)
64 seed-potato production farms were inspected and 195 samples were taken for detection of potato ring rot and brown rot. C. michiganensis subsp. sepedonicus was found in the fields of 7 farms (total area of 17.7 ha). In 2003, a monitoring programme of ware potatoes for the presence of ring rot and brown rot was initiated. 83 ware potato production farms were inspected and 128 samples were taken. C. michiganensis subsp. sepedonicus was found in 7 farms (total area of 90.2 ha). In all infected sites, control measures are being taken in accordance with EU Council Directive 93/85. In 2003, the Ministry of Agriculture also allocated financial compensations to infested farms in order to reduce their losses due to the application of compulsory phytosanitary measures.
During this survey, R. solanacearum was not found.
C. michiganensis subsp. sepedonicus: Present, found at 6 production sites, under official control.
R. solanacearum: Absent, confirmed by survey.
Glasshouse pests (Bemisia tabaci, Thrips palmi, Liriomyza spp.)
During surveys on glasshouse pests, 206 glasshouses (total area 48.08 ha) were inspected and 135 samples were collected.
- Bemisia tabaci (EPPO A2 list) was not found. Absent, confirmed by survey.
- Liriomyza bryoniae (EU Annexes) was found in 25 glasshouses (total infested area of 5,17 ha), on the following crops: capsicum, cucumber and tomato. Present, only in glasshouses.
- Thrips palmi (EPPO A1 list) was not found. Absent, confirmed by survey.
Globodera rostochiensis and G. pallida (both EPPO A2 list)
8839 soil samples were collected from 74 seed-potato production farms, 105 ware potato production farms and from 112 nurseries, and then tested. Inspections were also carried out on these sites. The presence of G. rostochiensis was confirmed in 6 seed potato production farms (infested area of 2.5 ha), in 2 ware potato production farms (8 ha) and in 4 nurseries (4.6 ha). Eradication measures are being taken in the infested areas. G. pallida was not found.
G. rostochiensis: Present, found in several production sites (6 seed-potato production sites, 2 ware potato production farms and 4 nurseries), under eradication.
G. pallida: Absent, confirmed by survey.
Phytophthora ramorum (EPPO Alert list)
In 2003, a survey for the presence of P. ramorum was initiated. 27 samples from all districts were collected. P. ramorum was not detected. Absent, confirmed by survey.
Puccinia horiana (EPPO A2 list)
68 production sites of chrysanthemum cut-flowers were inspected and P. horiana was found in 7 production sites with a total infected area of 1561,5 m². Present, found in 7 production sites of chrysanthemum cut flowers.
NPPO of Latvia, 2004-09.