National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field study conducted to evaluate the native tomato genotypes for their resistance to late blight under natural epiphytotics conditions was carried out during 2017-18 and 2018-19. Twenty native tomato genotypes were collected from different tomato growing areas of Nagaland, Manipur and Arunachal Pradesh. Characteristics of tomato genotypes revealed that most of the collected genotypes were indeterminate in nature except Pusa Ruby (semi-determinate), Arka Rakshak, F1 hybrid (determinate) and T2 (determinate). The late blight disease severity was assessed visually on stems, leaves and fruits of all plants of each replication following scale 0-5, when total late blight infestation had occurred in the control plot. Disease severity data revealed that least PDI was recorded in T3 (16.81) and T17 (35.99) whereas highest PDI was recorded in Arka Rakshak, with 89.72. This experimental result revealed that most of the genotypes (20 genotypes) reacted as highly susceptible, while T3 (16.81 PDI) and T17 (35.99 PDI) was found resistant and tolerant respectively. These results clearly indicate that a good source of resistance to late blight is available in the genotype T3 (cherry tomato). The resistant genotype thus obtained through this experiment shows a potential disease resistance trait contributor for tomato breeding against late blight disease.
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