An SEM study of the oospore
of some Nitella species (Chlorophyta, Charales) with descriptions of wall ornamentation and an assessment of its taxonomic importance.
Sexual structures produced by Phytophthora species after mating are called oospores
and are produced by a single individual in homothallic species, or when two individuals bearing different mating types come into contact in heterothallic species.
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.
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
Biometry of oospores
and oogonia of Pythium (Oomycetes): the independent taxonomic value of calculated ratios.
After seven days at 20[degrees]C, in the dark, the oospores
formation was observed.
The pathogen is mainly perpetuated through tuber and soil through production of oospores
. The management of the disease can be done through host resistance, cultural adjustments, biological and use of fungicides.
It can be suggested that Hyaloperonospora parasitica persists as oospores
in the soil over several years.
The abundance of Characeae oospores