Induction of resistance with organic nutrients in rice for the management of brown plant hopper Rani B. Usha1, Rajendran R.2, Suresh K.2 1HC&RI, Periyakulam 625 603, India. 2Department of Entomology, AC&RI, Madurai-624 104, India. Abstract The resistant sources used in this study were IR 36, IR 64, TKM 6, MDU 3 and ADT 36. FYM, biofertilizers (Azospririllum + phosphobacterium + silicate solubilizing bacteria (SSB), neem cake and lignite fly ash were used as organic nutrient source. In addition, laboratory study was conducted to study the mechanism of resistance in terms of population build up, growth and development and feeding activity. The results of the field trial indicated that the hopper population was consistently reduced due to combined effect of IR 64 and FYM, Azospirillum, phosphobacterium, SSB, lignite flyash and neem cake. Significantly prolonged nymphal duration, lower nymphal survival, lower growth index, lower adult emergence and longevity of hoppers were noticed in the treatment with the varieties IR 64 and IR 36 treated with FYM. Azospirillum, phosphobacterium, SSB, lignite flyash and neem cake than in the susceptible check T(N)I. The area of honeydew spot and correspondingly the weight of honeydew were significantly less in the varieties IR 36 and IR 64 treated with organic nutrients. In addition number of feeding probes was higher in the above said promising treatments. Top Key words BPH, Organic manures, Oryza sativa, Resistant source. Top |