I. IVANOVA
Central laboratory for plant quarantine,
120 Gornobanski Blvd.,Sofia 1330, BG
The D. virgifera has been found
for the first time in Bulgaria in 1998. The pest has spread in northwest
in Bulgaria near the borders with Serbia and Romania.
In 2001 the monitoring had following goals:
1. permanent observation posts for reporting
of the population density
2. limits of the dissemination of the
pest
3. eventual damages in the area in which
the corn has been grown as monoculture and where in year 2000 were determined
adults
METHODS USED:
For discovering of larvae in the region
where in 2000 were determined higher numbers of adults of WCR May - June
were completed soil digging. soil sampling were taken in Bregovo, Dolna,
Bijala, Retchka, Prevala and in other places in the regions of Vidin and
Montana. Soil digging were accomplished from selected places that
were plants obviously with deviation from the norms of development and
also occasionally chosen normal plants.
The WCR monitoring program for determination
of the limits of the spreading and the population density continued with
40 yellow sticky traps and 130 pheromone traps. They were situated on
41 monitoring sides (8 permanent sites). They were situated of Northwest
Bulgaria The monitoring started in beginning of July in the regions of
Vidin, Vratza, Sofia.
Results: Until now there were not found
larvae and damages by them in the digging activities on places. On 12.07
in Bregovo were captured the first adults -12, in D. B. Retchka – 6. The
higher numbers was caught in Gramada –548. Followed by highest numbers
in Prevala –265, Bregovo –149. Total numbers of trapped specimens
was 1795.
CONCLUSION:
1. the distribution of WCR continued forward
south and east.
2. for the first time were determined
damages in the corn silk and leaves in prevala. damages in other area where
was considered great density of WCR, were not determined.
3. the pest has been found near town Kneja
and also south of Stara Planina (near Godetch)
4. from several years in the region of
lom, where the pest was discovered for the first time were not found adults.
Acknowledgements: FAO support of WCR Network activity , Prof. J.Kiss, Prof. R. Edwards