Vol. 11, Issue 11 (2022)

Botrytis blight of Lilium is one of the most important destructive diseases caused by the fungus Botrytis cinerea Pers. Fr. A total of 21 Lilium germplasm lines were screened under natural epiphytotic conditions followed by screening of moderately resistant to resistant cultivars under artificially inoculated controlled conditions against single virulent isolate of B. cinerea Pers. Fr. All the germplasm lines were found susceptible to the disease but to significantly varying extents. Among the tested germplasm lines, seven were categorized as resistant (Revena-1, Revena-3, A-4 pink palace, Rialto, Cobra, Tiber, Conca–D), five as moderately resistant (Navasin, Navona, Nello, Blackout, Tresor), four as moderately susceptible (Courier, Archachon, Indian summer set, Nashvillae), four as susceptible (Litouwen-6, V-4 Litouwen, Yellow diamond, Pavia) and remaining one as highly susceptible (Malesco-5). Of these twelve moderately resistant to resistant test germplasm lines, three showed resistant response (A-4 pink palace, Cobra, Tiber), five moderately resistant (Revena-1, Reven-3, Rialto, Conca-D, Blackout), three moderately susceptible (Navasin, Navona, Tresor) and remaining one susceptible (Nello) when tested under artificially inoculated controlled conditions. On the basis of per cent disease intensity (PDI) oriental lines were categorized as resistant, Asiatic lines as moderately resistant or moderately susceptible and LA’s (Longiflorum X Asiatic) are susceptible in reaction. Among the test germplasm lines Malesco-5 showed highest disease severity of 50.84% whereas, germplasm line Tiber showed lowest disease severity of 1.97%.