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Techniques of Screening Peas for Resistance to Phoma medicaginis var. pinodella¹

Footrot and foliar phases of the disease caused by Phoma medicaginis var. pinodella in peas (Pisum sativum L.) were studied. Major objectives were to develop repeatable inoculation procedures and to identify pea lines resistant to footrot and foliar infection. All tests were conducted under controlled environmental conditions. Fungal spore concentrations and plant age at inoculation were important for identifying differences in disease reactions among lines. Significant differences in reactions to footrot were obtained among lines when pea seeds were immersed for 5 min. in inoculum adjusted to 1 x 10⁴ spores/ml, planted in a sterile soil mixture, and scored 10 days later. Significant differences in resistance among pea lines to the foliar phase of the disease were obtained when 15-day-old pea seedlings were sprayed with inoculum containing 1 x 10⁵ spores/ml and scored 10 days later. Footrot scores ranged from 1.2 to 4.8, and foliar disease scores ranged from 2.1 to 4.9 when 96 pea genotypes were rated on a 1 to 5 scale (1 = symptomless and 5 = very severe disease). There was no significant correlation between footrot and foliar disease scores, indicating that different genetic factors may control reactions to the two phases of the disease.

Key Words: Pisum sativum L. • Screening tests • Disease resistance • Footrot • Foliar infection

² Rockefeller Foundation graduate research fellow, Dep. of Agronomy and Soils, Washington State Univ., Pullman, WA 99164; research geneticist, USDA-ARS, Washington State Univ., Pullman, WA 99164; and research plant pathologist, USDA-ARS, Irrigated Agric. Res. and Ext. Ctr., Prosser, WA 99350.

Received for publication October 8, 1981.