First identification key for charophyte oospore
from central Europe.
Celakovsky (1874) had recognized three generations in the life cycle of Coleochaete: zoospore-producing thalli (A); gamete-producing thalli (B); and the multicellular body produced from the fertilized oospore
The latter two species are heterothallic thus did not produce oospores
and or sexual structures in single cultures.
Determination of viability of Phytophthora capsici oospores
with tetrazolium bromide staining test versus a plasmolysis method.
According to macrofossil data, the number of Chara oospores
and Potamogeton seeds decreased significantly in comparison with the previous zone.
Production and germination of oospores
of Phytophthora infestans.
Inoculum was provided by soilborne oospores
, the levels of which had been built up over the years by ploughing infected plants into the soil following each screen, and airborne sporangia from rows of infected 7042(S) and HB 3 genotypes planted every 9th row.
Some of the new strains resist fungicides and may mate with strains already here and produce the long-lived oospores
The isolate is heterothallic forming aplerotic oospores
, which measured 19.
The pathogen is mainly perpetuated through tuber and soil through production of oospores
It can be suggested that Hyaloperonospora parasitica persists as oospores
in the soil over several years.
The abundance of Characeae oospores