An experiment was conducted for evaluation of tomato germplasm in field
conditions and by artificial inoculation method in polyhouse conditions against
early blight for two successive years at tomato farm of Swar region of Rampur
district during cropping season from February to March. The total 141 tomato
germplasms/cultivars were screened, including wild accessions, exotic collection,
indigenous cultivars and advanced lines. Among the 141 germplasms, 5 wild
accessions viz. EC-520057, EC-520058, EC-520059, EC-52061 and EC-501583
exhibited complete resistant against early blight and 10 lines viz. RCMT-1,
LA-40-40-1, KS-118, H-88-78-3, IIVR-Sel-2, H-88-78-1, EC-538394, EC-538404,
NCEBR-4 and EC-508765 found moderately resistant. The 36 cultivars were found
moderately susceptible where disease severity was recorded up to 70%. The 55
cultivars were found to be susceptible and 35 were reported as highly
susceptible where disease severity recorded up to 100% under the field
screening. In another set of experiment spore suspension of having the three
different cfu levels i.e. 125, 185
and 245 were sprayed on pot experiment under polyhouse conditions on 25
cultivars of tomato to check susceptibility of tomato plant, the higher values
of cfu (i.e. 245 cfu) of A. solani were able to break the
immunity of plants, in which KDTS-71, DVRT-1-2, CO-3, PANT-T-3 and VFN-8 were
found to be highly susceptible to early blight in field screening as well as
polyhouse conditions.