Author(s):

Sanjay Kumar, Parvinder Singh Sekhon and Amanpreet Singh

Abstract: In a study conducted at Punjab Agricultural University, Ludhiana during 2015-16 and aimed at exploring the variation in quality of seed-lots having different storage conditions, 50 seed potato lots of variety Kufri Pukhraj were collected at random from seed growers of Punjab. There was a large significant (P<0.001) variation among seed-lots in terms of quality (thumb nail injury, scab, Fusarium dry rot and wet rot). The variation in seed-lots varied from 0.0-6.7%, 0.0-23.0%, 0.0-90.0% and 0.0-30.0% in respect of scab, scurf, Fusarium dry rot and wet rot, respectively. Positive correlation was found between thumb nail injury, wet rot and Fusarium dry rot. The field experiment was conducted by taking all the 50 seed-lots as treatments and replicated thrice in randomized block design layout. The variation in seed-lots varied from 2.8-36.4%, 0.0-31.8%, 0.0-9.2% and 0.0-16.5% with respect to Rhizoctonia stem canker, scurf, scab and russet scab, respectively. Morphological characteristics of heavily dry rot isolates were also studied with respect to size of microconidia, macroconidia and chlamydospore.

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