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
Famous quotes containing the word environment:
“People between twenty and forty are not sympathetic. The child has the capacity to do but it can’t know. It only knows when it is no longer able to do—after forty. Between twenty and forty the will of the child to do gets stronger, more dangerous, but it has not begun to learn to know yet. Since his capacity to do is forced into channels of evil through environment and pressures, man is strong before he is moral. The world’s anguish is caused by people between twenty and forty.”
—William Faulkner (1897–1962)
“Modern man’s capacity for destruction is quixotic evidence of humanity’s capacity for reconstruction. The powerful technological agents we have unleashed against the environment include many of the agents we require for its reconstruction.”
—George F. Will (b. 1941)
“Today the young actors regard their environment with rage and disgust. They regard their Master not as disciples regard their Master, but as slaves regard their Master.”
—Judith Malina (b. 1926)