Abstract
Field studies were conducted during 1986 and 1987 to quantify the relationship between the number of European corn borer, Ostrinia nubilalis (Hübner), larvae per corn plant, plant growth stage, and corn grain yield for Pennsylvania. Corn plants were artificially infested with third-instar O. nubilalis during four plant stages (10-leaf, 16-leaf, blister, and dough) with 0, 2, 4, or 6 larvae per plant. Differences in grain weights between the uninfested check plots and highest infestation levels for 10-leaf, 16-leaf, blister, and dough stages of corn development in 1986 were 63.84, 69.07, 47.09, and 13.17 g per plant, respectively. In 1987, corn grain weights were reduced at six larvae per plant from the check by 50.57, 33.73, 22.9, and 2.79 g per plant for 10-leaf, 16-leaf, blister, and dough stages of corn development, respectively. Based on the linear regressions of the relationship between number of larvae per plant and corn grain weight for all four corn growth stages by year, average grain weight reductions across years when stalk feeding was initiated during the 10-leaf, 16-leaf, blister, and dough stages of plant development were 5.94, 5.01, 3.13, and 2.41% per larva per plant, respectively. Economic injury levels are presented for cases in which 100% control of O. nubilalis populations is assumed, and a method is shown for calculating economic injury level values when less than 100% control is expected.
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Claims 4
Claim · model-written summary
In 1986, highest infestation versus checks gave grain-weight differences of 63.84, 69.07 and 47.09 g per plant at 10-leaf, 16-leaf and blister stages.
- Taxon
- corn
Zea mays subsp. mayse0 - Organ / stage
- 10-leaf, 16-leaf, blister, and dough stagese0
- Treatment
- highest infestation levelse0
- Interactor
- European Corn Borer
Ostrinia nubilalist0pest - Outcome
- grain weightse0
- Value
- 63.84, 69.07, 47.09, and 13.17 g per plante0
- Comparator
- uninfested check plotse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in grain weights between the uninfested check plots and highest infestation levels for 10-leaf, 16-leaf, blister, and dough stages of corn development in 1986 were 63.84, 69.07, 47.09, and 13.17 g per plant, respectively.”
t0“European Corn Borer”
Claim · model-written summary
In 1987, six larvae per plant reduced corn grain weight against checks by 50.57, 33.73, 22.9 and 2.79 g per plant across four stages.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- six larvae per plante0
- Interactor
- European Corn BorerOstrinia nubilalist0pest
- Outcome
- corn grain weightse0
- Direction
- reducede0
- Value
- 50.57, 33.73, 22.9, and 2.79 g per plante0
- Comparator
- the checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1987, corn grain weights were reduced at six larvae per plant from the check by 50.57, 33.73, 22.9, and 2.79 g per plant for 10-leaf, 16-leaf, blister, and dough stages of corn development, respectively.”
t0“European Corn Borer”
Claim · model-written summary
Mean grain weight losses per larva were 5.94, 5.01, 3.13 and 2.41% for feeding initiated at 10-leaf, 16-leaf, blister and dough stages.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- 10-leaf, 16-leaf, blister, and dough stagese0
- Interactor
- European Corn BorerOstrinia nubilalist0pest
- Outcome
- grain weight reductionse0
- Direction
- reductionse0
- Value
- 5.94, 5.01, 3.13, and 2.41% per larva per plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“average grain weight reductions across years when stalk feeding was initiated during the 10-leaf, 16-leaf, blister, and dough stages of plant development were 5.94, 5.01, 3.13, and 2.41% per larva per plant, respectively.”
t0“European Corn Borer (Lepidoptera: Pyralidae) Populations Infesting Pennsylvania Field Corn”
Claim · model-written summary
The authors present economic injury levels assuming 100% control and a calculation for lower control.
- Taxon
- CornZea mays subsp. mayst0
- Interactor
- O. nubilalisOstrinia nubilalise0pest
- Outcome
- economic injury level valuese0
- Value
- 100%e0
- Qualifier
- less than 100% controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Economic injury levels are presented for cases in which 100% control of O. nubilalis populations is assumed, and a method is shown for calculating economic injury level values when less than 100% control is expected.”
t0“European Corn Borer (Lepidoptera: Pyralidae) Populations Infesting Pennsylvania Field Corn”
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infection · Ostrinia nubilalis · Zea mays (maize)Results agree
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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.