Dynamics of distribution of the powdery mildew on wheat in the Dobrudzha agricultural institute during 2016 - 2017
Yordanka Stanoeva
Dobrudzha Agricultural Institute - General Toshevo, 9521, General Toshevo
Резюме
Powdery mildew caused by Blumeria graminis f.sp. tritici is an annual disease on
wheat in all regions where the crop is grown. Twenty lines and varieties of wheat
were involved in the investigation. The seeds from the lines were sown in plastic
pots and grown till stage second leaf in isolation to avoid possible infection with
powdery mildew. After stage second leaf, the plants were transferred to the wheat
crop and the insulators were removed and the plants remained in the field for 8
hrs, then were again covered with insulators and taken back to the greenhouse for
further growth. Readings on the attacking rate of the pathogen were done on the
10th day. The dynamics of propagation of the pathogen’s population in the wheat crop varied significantly depending on the climatic conditions. The results from the
investigation showed that different virulence was formed in the powdery mildew
population which varied by amount and distribution over the investigated years.
The highest attacking rate was realized by the pathogen’s population with virulence
V- 1, V- 2+, V- 4a, V- 4b, V- 5, V- 8 и V- Mli. Populations V- 3b, V- 17 и V- Mld were
with a low rate of propagation.
