Abstract
Field experiments were conducted under lowland conditions at the Africa Rice Centre (WARDA) Research Farm Abakaliki during 2006 and 2007 wet seasons to evaluate the effect of different nitrogen levels and plant spacing on the incidence of rice stem borers (Chilo zacconius Bles, Diopsis macropathalman Daman, Maliarpha separatalla Rog, Sesamia calamistis and Sciropophaga spp. Hamp.). Fields were laid out in split-plots, in randomized complete block design with three replications. Three nitrogen levels (0 kg N ha-1, 80 kg N ha-1 and 160 kg N ha-1) as the main- plot treatments were tried with three plant spacings (10 x 10 cm, 20 x 20 cm and 30 x 30 cm) as sub-plot treatments. The results from the two factors show that the incidences of stem borers were highest when rice treated with 160 kg ha-1 was planted at 10 x 10 cm plant spacing. Conversely, the incidence rates decreased significantly (p
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