National Academy of Agricultural Sciences (NAAS)
|
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 |
The relative resistance or susceptibility of nearly 215 rice genotypes supplied by Indian Institute of Rice Research, Hyderabad was screened to identify the resistant genotype against rice yellow stem borer. The trial was conducted following augmented block design with two checks i.e., local check (BPT 5204) and susceptible check (TN1) for a period of two successive kharif seasons (2016 & 2017). The per cent incidence of stem borer was recorded at their peak infestation of dead hearts at tillering stage and white ears at reproductive stage. The status of the screened genotypes was determined by following the standard evaluation scale (SES) for stem borer as suggested by IRRI. The pooled results of screening trial for two seasons inferred that, among 215 genotypes screened, no entry exhibited resistance scale, 87 entries registered moderate resistant, 116 were found moderately susceptible and 22 lines recorded the susceptible scale with respect to per cent dead hearts infestation. Correspondingly, the pooled mean data relating to per cent white ears indicated that, only 14 entries were resistant, while 101 entries had registered moderate resistant, 82 entries were moderately susceptible, 17 entries recorded susceptible status and only 1 entry had exhibited susceptible status. The rice entries which had exhibited resistance at dead heart stage were found susceptible at white ears stage and vice versa as both the factors were independent. Hence, upon clean examination only seven rice entries with IC No. 381538, 450535, 463380, 464140, 464186, 574807 and 578388 were found to exhibit resistance or moderate resistance against yellow stem borer at both vegetative and reproductive stages of rice crop.
Citations |
 |
 |
 |
 |
