Response of local potato cultivars to late blight disease (Phytophthora infestans (mont.) De bary) under field and laboratory conditions at Pakhribas, Dhankuta, Nepal

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Seven local potato cultivars along with two checks Kufri Jyoti and Janakdev were nbsp evaluated nbsp for nbsp their nbsp resistance nbsp against nbsp late nbsp blight nbsp caused nbsp by Phytophthora nbsp infestans in nbsp nbsp at nbsp Pakhribas nbsp Dhankuta nbsp Nepal nbsp under nbsp field nbsp and nbsp laboratory nbsp conditions nbsp Field nbsp experiment nbsp was nbsp conducted nbsp under nbsp natural nbsp epiphytotic nbsp conditions nbsp Laboratory nbsp experiments included detached leaf and tuber slice assays under artificially inoculated nbsp conditions In the field Lumle Kalo and Janakdev showed resistant reaction while nbsp cultivars nbsp Hale nbsp Rato nbsp Lumle nbsp Seto nbsp Kalo nbsp and nbsp Seto ndash moderately nbsp resistant nbsp and nbsp Phul ndash susceptible to late blight In detached leaf assay Janakdev showed highly resistant nbsp reaction Kalo ndash resistant Lumle Kalo and Hale ndash moderately resistant and Lumle Seto nbsp Rato Seto and Phul ndash susceptible reactions In tuber slice assay Kalo Lumle Kalo Phul nbsp and Rato showed resistant reaction Janakdev and Seto ndash moderately resistant and Hale nbsp and Lumle Seto ndash susceptible The check cultivar Kufri Jyoti gave highly susceptible nbsp reactions in all the experiments Susceptibility levels measured in the detached leaf nbsp assay was highly correlated r with converted field scale values although the nbsp correlation was lower for the tuber slice assay r Low correlation in the tuber nbsp assay may have also reflected genetic systems and or structural differences as foliage nbsp and tuber blight resistance are not always correlated Lumle Kalo can be utilized as nbsp source of resistance against late blight for breeding and general cultivation by farmers nbsp of Pakhribas and similar conditions