To sample straw, take core samples from at least 20 randomly selected bales in a lot. To sample a pasture, take grass plants from at least 20 locations. Air dry the grass, not in direct sunlight. Seal samples in a polyethylene freezer bag and label them with your name, phone number, and a sample identification. The Oregon Department of Agriculture Lab tests seed for endophyte.
Results show the percentage of seeds infected by endophyte.
For example, a 25 percent level means that 25 out of 100 seeds contain endophyte and will produce infected plants. Many producers obtain this certification if they plan to sell the seed out of state. The OSU Seed Lab tests seeds and living plants for endophyte as well. When the grass plant is dead, the endophyte also is dead. Therefore, with grass seed straw or screenings it is necessary to test for the toxins rather than for the endophyte.