Unit for Applications of Systems Simulation, NRL Building, Indian Agricultural Research Institute, New Delhi-110 012, (India).
1Directorate of Rice Research, Rajendranagar, Hyderabad - 500 030, India.
The yield loss simulation (YLS) model and the MACROS L1Q.CSM model were used to simulate the effect of stem borer damage by detillering @ 5, 15, 30, 60% at vegetative, panicle initiation and grain filling stages, on yield of rice cultivar Ratna. The stem borer damage during vegetative and panicle initiation stages was not simulated appropriately by both the models. Relatively MACROS simulated pest effects better than YLS at these stages. The predicted reduction in yield due to detillering at grain filling stage varied from 10.93–62.5 and 2.59–57.2% with the YLS and the MACROS, respectively in comparison to observed reduction of 4.8–56.1%. The simulated and observed pest effects on crop yield during grain filling stage were found to be comparable.
