Proceedings of the Vertebrate Pest Conference

Control operations at 6-month intervals, continued for four years in crop fields, reduced the rodent population to 5.08 percent losses to agricultural production. After eight crop seasons, a significant reduction in rodent density was observed in treated areas when compared with that of the control areas (P < 0.01). Correlation between pre-treatment population index (y) and number of seasons (log of x) was found to be 0.91 (P< 0.01). A relationship was established between y and x: y = 0.804.0-0.9621 log x. From this equation, it can be inferred that rodent population will reach zero level after treating crop fields continuously for 6.85 or say 7 .0 (seven) seasons. After control, the numbers of predominant rodents, Tatera indica, Meriones hurrianae, and Rattus meltada, were significantly reduced and the residual population was composed of Mus booduga, Gerbillus spp., Rattus gleadowi, Golunda ellioti, and Funambulus pennanti.