International Journal of Current Microbiology and Applied Sciences

ISSN: 2319-7706 Volume 2 Number 9 (2013) pp. 153-159

Evaluation of cultivars of potato (Solenum tuberosum) for disease reaction against late blight pathogen [Phytophthora infestans (Mont) de Bary]

S.H.Peerzada, Mushtaq Ahmad, G.H.Dar, M.A.Chattoo1 and K.A.Bhat*

Division of Plant Pathology, Sher-e-Kashmir, University of Agricultural Sciences and Technology of Kashmir, J & K, India, 191121 1Department of Vegetable Science, Sher-e-Kashmir, University of Agricultural Sciences and Technology of Kashmir, J & K, India, 191121 *Corresponding author e-mail: khurshid_agri@yahoo.com

ABSTRACT

Categorization of thirty five genotype/cultivars into different reaction groups, based on the late blight intensity exhibited by them over two years of evaluation, revealed that an overall mean blight incidence in the range of 41.11 to 78.80 per cent and blight intensity in the range of 23.21 to 69.05 per cent with A values in the range of 105.37 to 428.66. The genotypes PP 48, PP 2500,DPL 11, 92-P-27,MP 92- 63,SMP 91-15-15 and MPT 11 exhibited least mean disease incidence of less than 50 per cent and blight intensity of less than 30 per cent. The genotype which yielded the minimum A valve for the disease include MPT 11 (114.21) 92-p-27 (120.81), MP1 (118.51), PP2500(115.06), MP 97-699(120.18), DTP-1(117.12) and PP48(105.33). None of the 35 genotypes/cultivars was resistant to late blight (P.infestans) disease. However, 31 genotypes/cultivars fell under moderately resistant category whereas four other genotypes/cultivar were categorized as susceptible.

Keywords

P.infestans; Host resistance; Solenum tuberosum; blight pathogen; cultivar secreening