VARIETAL REACTION OF ROSE AGAINST BLACK SPOT CAUSED BY Diplocarpon rosae Wolf. IN ARUNACHAL PRADESH

Varietal reaction trial was conducted at Instructional farm, Department of Floriculture, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh during April 2011 to March 2012. Out of the thirty seven rose varieties evaluated under open condition none were found highly resistant or resistant. Three varieties namely Paradise, Shabnam and Pixie were moderately resistant. Eleven varieties namely Angelica Rinae, Atago, Folklore, Granada, Hot Cocoa, Mardigras, Midas Touch, Mrinalini, Revival, Tipus flame and Vic tor hugo were recorded moderately susceptible. Twelve varieties viz., Baccardi, Claudia Ribond, Charies Mallerier, Crimson Lace, Dr. Pal, Impatient, Madam Dulbourde, Marcopolo, Melody, Rainbow End, Sonia and Sugandha gave susceptible reaction. Eleven varieties viz., Angelique, Christiandior, Gemini, Gladiator, Golden Jubilee, Priyadarsini, Sand, Centaury, R. R. M. Roy, Sweet Promise, Unforgotten and Vale of Cloyd were recorded highly susceptible reaction against black spot of rose incited by Diplocarpon rosae Wolf.