Environment
There are three main components of the environment that affect the effectiveness, speed, and ability of P. fragariae to infect: soil moisture, temperature, and pH. P. fragariae occurs frequently in wet, cool soils. Soil moisture has been proven to carry the greatest importance. Soils that receive lots of steady water from rain or melting snow, as well as soils with poor water drainage that become waterlogged, produce the ideal conditions. In fact, there is a direct correlation between the soil moisture and the percentage of roots that were infected with P. fragariae. Temperature plays an important role in the environment needed for P. fragariae. The disease will grow in the temperature range from 5°C to 25°C (41°F to 77°F). However, as you approach the lower and higher ends of the temperature range, the disease develops and spreads more slowly. The optimum temperature range for P. fragariae is between 10°C and 15°C (40°F to 59°F). The effect of pH is more difficult to understand; oospores germinate best in soils with a higher pH. In contrast, soils with a lower pH are better suited for the mycelium and more mature parts of the fungus.
Read more about this topic: Phytophthora Fragariae
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