Abstract
Corn, Zea mays L., and soybean, Glycine max (L.) Merrill, were intercropped for silage in 1985 and 1986 at the Central Experimental Farm, Ottawa, to determine effects on yields and the percentage of European corn borer, Ostrinia nubilalis Hubner, infestation. A 2 × 2 × 3 factorial was analyzed with two corn hybrids (dwarf PAG 391134 and tall Coop 5259), two corn cropping systems (monocropped and intercropped), and three nitrogen fertilizer levels (0, 60, and 120 kg N/ha). Intercropping significantly reduced European corn borer infestation in tall corn in 1985 and in both corn hybrids in 1986. Dwarf corn was infested significantly less than tall corn in both years and in both cropping systems. The commonly applied rate of 120 kg N/ha resulted in the highest European corn borer infestation. Yields and land equivalent ratios at 60 kg N/ha were as high as those at 120 kg N/ha, but European corn borer infestation was significantly less at 60 kg N/ha. Application of 0 kg N/ha resulted in the lowest yields and land equivalent ratios, but European corn borer infestation was not different from levels at 60 kg N/ha.
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