1. The exceptions involve oospores , and hyphae present within tubers. 2. Improving soil tillage can help eliminate oospores from the soil. 3. The pathogen can persist in the soil for several years as oospores . 4. Oospore germination occurs when the oospore senses chemicals released by seeds or roots.5. Oospore germination occurs when the oospore senses chemicals released by seeds or roots. 6. This symptom is associated with the production of oospores in the leaf tissue. 7. The oospores are the main source of the primary inoculum of this disease. 8. The oospores then infect the roots of the seedlings. 9. The oospore will overwinter and germinate to produce infectious sporangia once conditions improve. 10. "Phytophthora sojae " overwinters in plant debris and soil as oospores .
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