Abstract
European corn borer (Ostrinia nubilalis Hübner) can severely affect commercial sweet corn quality during years of heavy infestation. The isolation and identification of allelochemicals in sweet corn which detrimentally affect O. nubilalis may enhance breeder selection for greater ear feeding resistance, thus reducing the need for insecticide application. Field selection techniques for improving plant resistance to O. nubilalis cannot easily distinguish between plant tolerance or antibiosis. A laboratory bioassay incorporating ear tissues from field resistant and susceptible sweet corn genotypes into a nutritionally complete O. nubilalis larval diet was developed as an initial step to facilitate the isolation and identification of potential chemical resistance factors in sweet corn. Neonates reared for 7 d on a meridic diet with limited fungal and bacterial contaminant control agents weighed more than larvae grown on a comparable diet with high levels of contaminant control (5.96 and 2.46 mg, respectively). Silk tissue from several sweet corn genotypes significantly reduced larval weight and increased total larval development time compared with kernel tissue. Silk tissues incorporated on a weight basis had volumes about 3 × that of an equal weight of kernel tissues. However, tissues incorporated into a specific diet volume on a weight or volume basis usually did not alter larval weight or time to pupation within a genotype. Incorporation on a weight basis was most time efficient. Future bioassays screening for antibiotic effects of sweet corn tissue on O. nubilalis development should utilize a diet with limited contaminant control agents, incorporate tissue on a weight basis, and focus on silk tissue.
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Claims 7
Claim · model-written summary
Larvae on a diet with limited contaminant control weighed more than those on a high control diet.
- Taxon
- Sweet Cornt0
- Interactor
- European Corn Borer
Ostrinia nubilalist0pest - Outcome
- Neonates reared for 7 d on a meridic diet with limited fungal and bacterial contaminant control agents weighed moree0
- Direction
- weighed moree0
- Value
- 5.96 and 2.46 mge0
- Comparator
- high levels of contaminant controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neonates reared for 7 d on a meridic diet with limited fungal and bacterial contaminant control agents weighed more than larvae grown on a comparable diet with high levels of contaminant control (5.96 and 2.46 mg, respectively).”
t0“Sweet Corn Antibiosis on European Corn Borer”
Claim · model-written summary
Sweet corn silk reduced larval weight relative to kernel tissue.
- Taxon
- sweet corne0
- Organ / stage
- Silk tissuee0
- Treatment
- Silk tissuee0
- Interactor
- European Corn BorerOstrinia nubilalist0pest
- Outcome
- larval weighte0
- Direction
- reducede0
- Comparator
- kernel tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Silk tissue from several sweet corn genotypes significantly reduced larval weight and increased total larval development time compared with kernel tissue.”
t0“Sweet Corn Antibiosis on European Corn Borer”
Claim · model-written summary
Sweet corn silk increased larval development time relative to kernel tissue.
- Taxon
- sweet corne0
- Organ / stage
- Silk tissuee0
- Treatment
- Silk tissuee0
- Interactor
- European Corn BorerOstrinia nubilalist0pest
- Outcome
- larval development timee0
- Direction
- increasede0
- Comparator
- kernel tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Silk tissue from several sweet corn genotypes significantly reduced larval weight and increased total larval development time compared with kernel tissue.”
t0“Sweet Corn Antibiosis on European Corn Borer”
Claim · model-written summary
Silk tissue occupied about three times the volume of equal weight kernel tissue.
Verbatim
e0“Silk tissues incorporated on a weight basis had volumes about 3 × that of an equal weight of kernel tissues.”
t0“Sweet Corn Antibiosis on European Corn Borer”
Claim · model-written summary
Weight versus volume incorporation usually did not change larval weight or pupation time within a genotype.
- Taxon
- Sweet Cornt0
- Interactor
- European Corn BorerOstrinia nubilalist0pest
- Outcome
- larval weight or time to pupatione0
- Direction
- did not altere0
- Comparator
- weight or volume basise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tissues incorporated into a specific diet volume on a weight or volume basis usually did not alter larval weight or time to pupation within a genotype.”
t0“Sweet Corn Antibiosis on European Corn Borer”
Claim · model-written summary
Weight basis incorporation was most time efficient.
Verbatim
e0“Incorporation on a weight basis was most time efficient.”
t0“Sweet Corn Antibiosis on European Corn Borer”
Claim · model-written summary
Future corn borer antibiosis assays should use limited control agent diet and silk incorporated by weight.
- Taxon
- sweet corne0
- Interactor
- O. nubilalisOstrinia nubilalise0pest
- Outcome
- utilize a diet with limited contaminant control agents, incorporate tissue on a weight basis, and focus on silk tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Future bioassays screening for antibiotic effects of sweet corn tissue on O. nubilalis development should utilize a diet with limited contaminant control agents, incorporate tissue on a weight basis, and focus on silk tissue.”