RESPONSE OF WHITE LUPINE CULTIVARS TO PHOMA SP AND COLLETOTRICHUM-GLOEOSPORIOIDES

Colletotrichum gloeosporioides and Phoma sp. cause stem and pod rot of lupine (Lupinus albus) in eastern Canada. Six cultivars of lupine, Am iga, L2085N, Novella, Primorski, Rompet, and Ultra were evaluated for resistance to C. gloeosporioides and Phoma sp. by inoculating cotyledo ns collected from 8-day-old plants and stems of 1-week and 2-week-old seedlings. The same six cultivars, plus cv. Vladimir, were evaluated i n inoculated and noninoculated field trials in Quebec in 1994. Cultiva rs L2085N, Ultra, and Vladimir were also tested in 3 years of field tr ials in Nova Scotia in an area with high levels of anthracnose infesta tion. No cultivars were highly resistant, but some differences in susc eptibility were observed. Cultivars Vladimir, Rompet, and Primorski we re less susceptible to C. gloeosporioides than Amiga, L2085N, or Ultra . Amiga and L2085N were more susceptible to Phoma sp. than other culti vars under controlled conditions, but not in the field. In trials cond ucted at Nova Scotia and averaged over three field years, seed yields of L2085N and Ultra were less than half that of Vladimir. These result s indicate that the stem and cotyledon inoculation techniques may be u sed to identify consistent differences among lupine cultivars in susce ptibility or resistance to C. gloeosporioides and Phoma sp.