Abstract
Field studies were conducted to determine how field corn, Zea mays L., phenologies in combination with transgenic Bacillus thuringiensis Berliner (Bt) corn and non-Bt (near isogenic) corn could affect egg laying by female European corn borer, Ostrinia nubilalis (Hubner), and subsequent larval injury. Transgenic Bt (events 176 and Bt11) and non-Bt corn was planted at three different times to assess the use of early- and late- planted Bt corn as a means for egg recruitment to these targeted planting dates. Plant growth stages, egg densities, and stalk tunneling was recorded at four locations in southwestern, central, and northern Iowa for three summers (1996-1998). No significant differences in egg densities were observed between Bt and non-Bt corn during the first and second generation for all three years. Significant differences did occur among planting dates. Between 50 and 100% of the eggs were laid in the early planting during the first generation. In addition, between 40 and 65% of the eggs were laid in the late planting for the second generation. Correlations between egg density and larval tunneling were inconsistent from year to year. Additional inconsistencies stemming from yearly phenological differences among sequential plantings and variable O. nubilalis populations increases the difficulty in recommending planting date adjustments as a practical management tool for European corn borer and Bt corn.
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Claims 5
Claim · model-written summary
Bt corn and non-Bt corn did not differ significantly in European corn borer egg densities in the first and second generation over three years.
- Treatment
- transgenic Bacillus thuringiensis Berliner (Bt) corne0
- Interactor
- Ostrinia nubilalis
Ostrinia nubilalise0pest - Outcome
- egg densitiese1
- Direction
- no_changeinferrede1
- Comparator
- non-Bt (near isogenic) corne0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field corn, Zea mays L., phenologies in combination with transgenic Bacillus thuringiensis Berliner (Bt) corn and non-Bt (near isogenic) corn could affect egg laying by female European corn borer, Ostrinia nubilalis (Hubner)”
e1“No significant differences in egg densities were observed between Bt and non-Bt corn during the first and second generation for all three years”
Claim · model-written summary
Egg densities differed significantly among planting dates; the direction of the difference is not stated.
- Treatment
- planting datese2
- Interactor
- Ostrinia nubilalisOstrinia nubilalise0pest
- Outcome
- egg densitiese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field corn, Zea mays L., phenologies in combination with transgenic Bacillus thuringiensis Berliner (Bt) corn and non-Bt (near isogenic) corn could affect egg laying by female European corn borer, Ostrinia nubilalis (Hubner)”
e1“No significant differences in egg densities were observed between Bt and non-Bt corn during the first and second generation for all three years”
e2“Significant differences did occur among planting dates”
Claim · model-written summary
Between 50 and 100% of the eggs were laid in the early planting during the first generation.
- Treatment
- early plantinge3
- Interactor
- Ostrinia nubilalisOstrinia nubilalise0pest
- Outcome
- eggs were laide3
- Value
- 50 and 100%e3
- Qualifier
- during the first generatione3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field corn, Zea mays L., phenologies in combination with transgenic Bacillus thuringiensis Berliner (Bt) corn and non-Bt (near isogenic) corn could affect egg laying by female European corn borer, Ostrinia nubilalis (Hubner)”
e3“Between 50 and 100% of the eggs were laid in the early planting during the first generation”
Claim · model-written summary
Between 40 and 65% of the eggs were laid in the late planting for the second generation.
- Treatment
- late plantinge4
- Interactor
- Ostrinia nubilalisOstrinia nubilalise0pest
- Outcome
- eggs were laide4
- Value
- 40 and 65%e4
- Qualifier
- for the second generatione4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field corn, Zea mays L., phenologies in combination with transgenic Bacillus thuringiensis Berliner (Bt) corn and non-Bt (near isogenic) corn could affect egg laying by female European corn borer, Ostrinia nubilalis (Hubner)”
e4“between 40 and 65% of the eggs were laid in the late planting for the second generation”
Claim · model-written summary
Correlations between egg density and larval tunneling were inconsistent from year to year.
- Interactor
- Ostrinia nubilalisOstrinia nubilalise0pest
- Outcome
- Correlations between egg density and larval tunnelinge5
- Qualifier
- inconsistent from year to yeare5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field corn, Zea mays L., phenologies in combination with transgenic Bacillus thuringiensis Berliner (Bt) corn and non-Bt (near isogenic) corn could affect egg laying by female European corn borer, Ostrinia nubilalis (Hubner)”
e5“Correlations between egg density and larval tunneling were inconsistent from year to year”
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See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.