Abstract
The sugarcane aphid, Melanaphis sacchari Zehntner, is an economically damaging pest of sorghum, Sorghum bicolor (L.), across the southern United States. Field experiments investigated impacts of sorghum cultivar, nitrogen fertilization, and insecticides on M. sacchari infestations and sorghum yields in Louisiana and South Carolina in 2017 and 2018. In South Carolina, M. sacchari densities in unprotected plots peaked on 30-31 July of both years before declining by early- to mid-August. In Louisiana, infestations peaked on 26 and 12 July for 2017 and 2018, respectively, and declined by mid-August. Nitrogen fertilization influenced M. sacchari densities in Louisiana in 2018 with the highest-level infestations recorded from plots that received high N rates. Densities of M. sacchari on susceptible sorghum cultivar, DKS 38-88, were 1.5- to 2.3-fold greater than on DKS 37-07 in both years in Louisiana and in 2018 in South Carolina. Nitrogen fertilization was associated with improved sorghum yields in Louisiana experiments. Sorghum yields across experiments were 2- to 4-fold greater in plots protected with multiple insecticide applications than in unprotected plots. Yield from plots with insecticides sprayed once at currently used action thresholds differed from unprotected plots only in the 2018 Louisiana experiment. Results from these experiments indicate insecticidal protection of susceptible sorghum cultivars remains critical throughout much of the southern United States. Further research is needed to develop integrated management programs that incorporate fertilization manipulation, cultivar resistance, and insecticidal control.
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Claims 8
Claim · model-written summary
South Carolina aphid densities peaked in late July and then fell by August.
Not reportedTaxon
Verbatim
e0“In South Carolina, M. sacchari densities in unprotected plots peaked on 30-31 July of both years before declining by early- to mid-August.”
Claim · model-written summary
Louisiana aphid infestations peaked on different July dates in 2017 and 2018, then declined.
Not reportedTaxon
Verbatim
e0“In Louisiana, infestations peaked on 26 and 12 July for 2017 and 2018, respectively, and declined by mid-August.”
Claim · model-written summary
High nitrogen rates produced the highest aphid infestations in Louisiana in 2018.
Not reportedTaxon
Verbatim
e0“Nitrogen fertilization influenced M. sacchari densities in Louisiana in 2018 with the highest-level infestations recorded from plots that received high N rates.”
Claim · model-written summary
Aphid densities on DKS 38-88 were 1.5 to 2.3 fold greater than DKS 37-07.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Densities of M. sacchari on susceptible sorghum cultivar, DKS 38-88, were 1.5- to 2.3-fold greater than on DKS 37-07 in both years in Louisiana and in 2018 in South Carolina.”
Claim · model-written summary
Nitrogen fertilization improved sorghum yield in Louisiana.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization was associated with improved sorghum yields in Louisiana experiments.”
Claim · model-written summary
Multiple insecticide applications raised sorghum yields two to four fold versus unprotected plots.
- Treatment
- multiple insecticide applicationse0
- Outcome
- yieldse0
- Direction
- greatere0
- Value
- 2- to 4-folde0
- Comparator
- unprotected plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum yields across experiments were 2- to 4-fold greater in plots protected with multiple insecticide applications than in unprotected plots.”
Claim · model-written summary
One threshold-based insecticide spray differed in yield from unprotected plots only in Louisiana in 2018.
- Treatment
- insecticides sprayed once at currently used action thresholdse0
- Outcome
- Yielde0
- Direction
- differede0
- Comparator
- unprotected plotse0
- Setting
- Louisianae0
Not reportedTaxon
Verbatim
e0“Yield from plots with insecticides sprayed once at currently used action thresholds differed from unprotected plots only in the 2018 Louisiana experiment.”
Claim · model-written summary
The authors concluded that insecticide protection of susceptible sorghum remains critical.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insecticidal protection of susceptible sorghum cultivars remains critical throughout much of the southern United States.”
The same questions in other papers
insecticide · yield · SorghumResults differ
18 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- no effect
18 papers more in this group
See all 22 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.