The field experiment was conducted at research farm of Indira Gandhi Krishi Vishwavidyalaya, Raipur during kharif season 2013-14 to know the population dynamics of Brown plant hopper (BPH), Nilaparvata lugens (Stal.), White backed plant hopper (WBPH) Sogatella furcifera (Horvath) and spiders in lowland conventional and organic farming. Sweeping net sampling method was used for catching immature and adult stages of insect pest and natural enemies present in rice ecosystem. The maximum population BPH was recorded in 1st week (45 SMW) of November with 26.25 adult/25 sweeps and 13.75 adult/25 sweeps in both lowland conventional rice ecosystem (LLC) and lowland organic rice ecosystem (LLO) respectively and showed highly significant negative correlation with minimum temperature, average temperature, evening relative humidity, average relative humidity and significant positive correlation with sunshine hours in both ecosystem. The maximum population of WBPH, S. furcifera was recorded during 43 SMW of October with 11.75 adult/25 sweeps in LLC while in LLO the maximum population of WBPH recorded during 3rd week (42 SMW) of October with 6.25 adult/25 sweeps. WBPH showed non-significant correlation with weather parameter. Maximum populations of spider, Tetragnatha spp., Araneus spp. Pardosa pseudoannulata and mirid bug, Cyrtorhinus lividipennis were recorded in LLO as compare to LLC during 46 SMW of November and showed significant negative correlation with minimum temperature, average temperature, evening relative humidity, average relative humidity while positive correlation with sunshine hours in both rice ecosystem. Spiders showed highly significant positive correlation with BPH in both ecosystems. Nilaparvata lugens (Stal.) and Tetragnatha spp. were dominant in both ecosystems.