Suppression ofOstrinia nubilalis byTrichogramma nubilale in sweet corn |
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| Authors: | D R Prokrym D A Andow J A Ciborowski and D D Sreenivasam |
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| Institution: | (1) Department of Entomology, University of Minnesota, 219 Hodson Hall, 55108 St. Paul, MN, USA;(2) Plant Industry Division, Minnesota Department of Agriculture, 90 West Plato Boulevard, 55107 St. Paul, MN, USA;(3) Present address: Niles Biological Control Laboratory, U.S. Department of Agriculture, 2534 South 11th Street, 49120 Niles, MI, USA |
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| Abstract: | We conducted inundative release experiments withTrichogramma nubilale (Hymenoptera: Trichogrammatidae) to suppressOstrinia nubilalis (Lepidoptera: Pyralidae) in sweet corn (Zea mays): two experiment duringO. nubilalis first generation and three experiments during second generation. Five measurements of ear and stalk damage were used to assess.O. nubilalis control in treated and untreated plots within each experimental field. In one experiment during second generation, naturalO. nubilalis populations were sufficiently high to demonstrate that the parasitoids (three releases totaling 4.4 million parasitoids per ha) parasitized an estimated 57.4% of the placedO. nubilalis egg masses and reduced the mean number ofO. nubilalis larvae per ear by 97.4% the number of tunnels per stalk by 92.9%, and the number of larvae per stalk by 94.3% in the release plot. Ear damage in this experiment was suppressed to meet acceptable standards for use in cut-corn commercial processing. Larval mortality was apparently density independent, which implies that density-dependent larval loss would not compensate for egg parasitism byT. nubilale. |
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| Keywords: | Trichogramma nubilale Ostrinia nubilalis inundative release sweet corn biological control |
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