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Screening Field Peas for Resistance to White Mold¹

Breeding lines and plant introductions were screened in a greenhouse to determine if genetic resistance to white mold (Sclerotlnla sclerotiorum (Lib) de Bary) exists in field pea (Pisum sativum L.). All experiments were conducted in mist chambers maintained at approximately 18 C and 90% relative humidity. Eleven-day-old seedlings were inoculated by placing one fungus infested oat kernel next to the base of each stem. Three days after inoculation, disease severity was determined by estimating the length of stem lesions.

Significant differences in disease severity were detected by this visual scoring method. The following plant introductions, breeding lines, and cultivars were more resistant than the susceptible check (‘Garfield’): PI 155109, PI 166188, PI 189171, PI 261622, PI 262189, PI 263027, PI 272191, PI 272205, PI 272209, ID 89-1, ID 2, Dark Skin Perfection, Perfection 132, and Wisconsin Perfection.

Key Words: Disease resistance • Fungal pathogen • Pisum sativum • Selerotinia sclerotiorum

² Graduate research assistant and assistant professor of plant breeding and genetics, respectively.

Received for publication June 18, 1978.