Abstract
The Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China. Bt transgenic corn provides a new tool for Asian corn borer control. Monsanto's YieldGard Bt transgenic corn expressing Cry1Ab protein, and a non-Bt control, were evaluated in Beijing. Laboratory bioassays were carried out by exposing neonates to an agar-free diet containing Bt corn whorl leaves, tassels, and anthers, or by exposing neonates directly to fresh silk and pollen. These are the tissues initially attacked by neonates in the field. All of these tissues, with the exception of pollen, contained sufficient insecticidal protein to kill > or = 95% of larvae within 7 d. Surviving larvae had also not grown beyond first instar and weighed < or = 0.1 mg. Although larvae feeding on Bt corn pollen were significantly smaller than those on non-Bt corn pollen, there was no significant difference in mortality. Field trials were also conducted with artificial infestations of Asian corn borer at mid whorl, late whorl, and silking stages. Damage ratings and number of larvae surviving per plant indicated that Bt corn was highly resistant to Asian corn borer. Therefore, YieldGard offers the potential for season-long protection against first- and second-generation Asian corn borer.
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Claims 9
Claim · model-written summary
Bt corn whorl leaves killed at least 95% of larvae within seven days.
- Taxon
- corn
Zea mays subsp. mayse2 - Material
- Bt corne0
- Organ / stage
- whorl leavese0
- Treatment
- Bt corn whorl leavese0
- Interactor
- Ostrinia furnacalis
Ostrinia furnacalise2pest - Outcome
- larvaee1
- Direction
- kille1
- Value
- > or = 95%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bt corn whorl leaves, tassels, and anthers”
e1“All of these tissues, with the exception of pollen, contained sufficient insecticidal protein to kill > or = 95% of larvae within 7 d”
e2“Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China”
Claim · model-written summary
Bt corn tassels killed at least 95% of larvae within seven days.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- tasselse0
- Interactor
- Ostrinia furnacalisOstrinia furnacalise2pest
- Outcome
- larvaee1
- Direction
- kille1
- Value
- > or = 95%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bt corn whorl leaves, tassels, and anthers”
e1“All of these tissues, with the exception of pollen, contained sufficient insecticidal protein to kill > or = 95% of larvae within 7 d”
e2“Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China”
Claim · model-written summary
Bt corn anthers killed at least 95% of larvae within seven days.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- antherse0
- Interactor
- Ostrinia furnacalisOstrinia furnacalise2pest
- Outcome
- larvaee1
- Direction
- kille1
- Value
- > or = 95%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bt corn whorl leaves, tassels, and anthers”
e1“All of these tissues, with the exception of pollen, contained sufficient insecticidal protein to kill > or = 95% of larvae within 7 d”
e2“Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China”
Claim · model-written summary
Surviving larvae remained at first instar and weighed at most 0.1 mg.
- Taxon
- cornZea mays subsp. mayse1
- Interactor
- Ostrinia furnacalisOstrinia furnacalise1pest
- Outcome
- Surviving larvae had also not grown beyond first instar and weighede0
- Value
- < or = 0.1 mge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Surviving larvae had also not grown beyond first instar and weighed < or = 0.1 mg”
e1“Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China”
Claim · model-written summary
Larvae feeding on Bt corn pollen were significantly smaller than those on non-Bt pollen.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Bt corn pollene0
- Interactor
- Ostrinia furnacalisOstrinia furnacalise1pest
- Outcome
- larvaee0
- Direction
- smallere0
- Comparator
- non-Bt corn pollene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“larvae feeding on Bt corn pollen were significantly smaller than those on non-Bt corn pollen”
e1“Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China”
Claim · model-written summary
Mortality on Bt corn pollen did not differ significantly from non-Bt pollen.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Bt corn pollene0
- Interactor
- Ostrinia furnacalisOstrinia furnacalise1pest
- Outcome
- mortalitye0
- Direction
- no significant differencee0
- Comparator
- non-Bt corn pollene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although larvae feeding on Bt corn pollen were significantly smaller than those on non-Bt corn pollen, there was no significant difference in mortality”
e1“Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China”
Claim · model-written summary
Field damage ratings indicated high Bt corn resistance to Asian corn borer.
- Taxon
- cornZea mays subsp. mayse1
- Material
- Bt corne0
- Interactor
- Asian corn borerOstrinia furnacalise0pest
- Outcome
- Damage ratingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Damage ratings and number of larvae surviving per plant indicated that Bt corn was highly resistant to Asian corn borer”
e1“Asian corn borer, Ostrinia furnacalis (Guenée), is the most important insect pest on corn in China”
Claim · model-written summary
Larvae surviving per plant in field trials indicated high Bt corn resistance.
- Taxon
- cornZea mays subsp. mayse0
- Material
- Bt corne0
- Interactor
- Asian corn borerOstrinia furnacalise0pest
- Outcome
- number of larvae surviving per plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Damage ratings and number of larvae surviving per plant indicated that Bt corn was highly resistant to Asian corn borer”
Claim · model-written summary
YieldGard was judged to offer potential season-long protection against first- and second-generation Asian corn borer.
- Taxon
- cornZea mays subsp. mayse1
- Interactor
- Asian corn borerOstrinia furnacalise0pest
- Outcome
- season-long protection against first- and second-generation Asian corn borere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“YieldGard offers the potential for season-long protection against first- and second-generation Asian corn borer”
e1“corn in China”
The same questions in other papers
Zea mays subsp. mays · Ostrinia furnacalis · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- positive
- positive
transgenic · Ostrinia furnacalis · Zea mays (maize)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.