These oospores can survive for up to 4 years; there are some reports of spores remaining viable 13 15 years.
32.
Oospores are very sturdy and can remain stagnant in the soil for a long time and therefore crop rotation alone is not effective.
33.
The germinating oospore undergoes mitosis and gives rise to diploid hyphae which reproduce asexually via mitotic zoospores as long as conditions are favorable.
34.
The most dependable way to determine if a plant has " P . fragariae " is the presence of microscopic oospores.
35.
Upon infection, oospores that overwinter on leaf tissue and petioles give rise to sporangiophores which have lemon-shaped sporangia at their tips.
36.
Searching for the oospores can be like looking for a needle in a haystack-- they are three-hundredths of one millimeter across.
37.
Oospores are made after the male gamete, antheridium, and female gamete, oogonium, undergo fertilization and then sexual recombination ( meiosis ).
38.
"Phytophthora cactorum " produces one sexually produced survival spore called an oospore, and one asexually produced survival spore called a chlamydospore.
39.
"P . halstedii " oospores produce a thin wall which are resistant structures, sexually produced that are essential for its continuation.
40.
The oospores may directly germinate into a germ tube or indirectly germinate and give rise to sporangia which then indirectly germinates and gives rise to zoospores.
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