Abstract
Popcorn was evaluated in two three-year studies for its potential as a refuge for European corn borer, Ostrinia nubilalis (Hubner), in two three-year studies. Objectives of these studies were to determine if more larvae were produced in popcorn than in field corn and to determine how popcorn influenced female oviposition and larval distribution within neighboring field corn. Two varieties of popcorn (Ml 40, 105d and M3374Y, 118d), one mixture of popcorn (50% 105d and 50% 118d), and field corn (DK580, 108d) were evaluated. Significantly higher densities of O. nubilalis larvae were found in popcorn than field corn. Moth oviposition and larval distribution were evaluated using 105d popcorn embedded in several cornfields across Iowa. Significantly more egg masses and larvae were found in the popcorn compared with field corn. One or two rows of field corn adjacent to popcorn tended to have higher numbers of egg masses and larvae compared with background field corn. Number of eggs per egg mass was significantly higher in popcorn than field corn. These data suggests more O. nubilalis are produced in popcorn than field corn.
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