Evaluation location: Oregon, United States
One test for physiological resistance to white mold (Sclerotina sclerotiorum) is the straw test developed by Petzoldt and Dickson. Seedlings were inoculated 23 to 25 days after planting and read 8 days later. Plants that appeared resistant at time of reading were re-inoculated after13 to 15 days and were read 8 days later. The controls OR91G, a susceptible bush lake snap bean, and MO162, a fairly resistantyellow-brown seeded dry bean, were inoculated at 4.5 weeks. The controls required extra time to obtain sufficient growth for testing. Most of the accessions were screened during the high light, warm temperature and low humidity months of summer. These conditions were less favorable for the pathogen, but more favorable for the host. Consequently, our susceptible control has a lower rating than normall observed during the winter months.