Abstract
Melanaphis sacchari Zehntner is a new pest of sweet sorghum in the United States, with the potential to cause complete crop failure. In Kentucky, sweet sorghum is normally planted in early May and harvested in late August or September. Planting sweet sorghum earlier in the season may avoid damaging levels of M. sacchari that develop in late summer. In a 2-yr field study, three different planting dates separated by a month (April, May, and June) were tested for their effect on M. sacchari densities and sweet sorghum yield. April (early) planted sweet sorghum was grown in greenhouses and transplanted to the field. May (mid) and June (late) planted sweet sorghum were direct seeded in the field. Melanaphis sacchari population densities were evaluated weekly starting in June. Sweet sorghum was harvested at the onset of the hard dough stage. Plots were split into two subplots, insecticide or noninsecticide, in the second year to control for planting date effect on yield. Early-planted sweet sorghum had lower aphid densities, but had lower yield relative to mid-planting date, which had the highest yield. Insecticide drenches in 2019 reduced cumulative aphid days in mid-plantings and late plantings, but did not significantly affect yield within planting dates. Seeding sweet sorghum earlier can reduce M. sacchari densities; however, this method alone may not provide the highest yields. We documented that the recommended planting date (May) for Kentucky produced the highest yield.
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Claims 6
Claim · model-written summary
Early planted sweet sorghum had lower aphid density.
Not reportedInteractorComparator
Verbatim
e0“Early-planted sweet sorghum had lower aphid densities”
Claim · model-written summary
Early planted sorghum yielded less than mid planted sorghum.
Verbatim
e0“Early-planted sweet sorghum had lower aphid densities, but had lower yield relative to mid-planting date”
Claim · model-written summary
Mid planted sorghum had the highest yield.
Verbatim
e0“mid-planting date, which had the highest yield”
e1“sweet sorghum yield”
Claim · model-written summary
Insecticide drenches reduced cumulative aphid days in mid plantings.
- Taxon
- sweet sorghume1
- Treatment
- Insecticide drenchese0
- Outcome
- cumulative aphid dayse0
- Direction
- reducede0
- Qualifier
- mid-plantingse0
Not reportedComparator
Verbatim
e0“Insecticide drenches in 2019 reduced cumulative aphid days in mid-plantings and late plantings”
e1“sweet sorghum yield”
Claim · model-written summary
Insecticide drenches reduced cumulative aphid days in late plantings.
- Taxon
- sweet sorghume1
- Treatment
- Insecticide drenchese0
- Outcome
- cumulative aphid dayse0
- Direction
- reducede0
- Qualifier
- late plantingse0
Not reportedComparator
Verbatim
e0“Insecticide drenches in 2019 reduced cumulative aphid days in mid-plantings and late plantings”
e1“sweet sorghum yield”
Claim · model-written summary
Insecticide did not significantly affect yield within planting dates.
- Taxon
- sweet sorghume1
- Treatment
- Insecticide drenchese0
- Outcome
- yielde0
- Direction
- did not significantly affecte0
Not reportedComparator
Verbatim
e0“Insecticide drenches in 2019 reduced cumulative aphid days in mid-plantings and late plantings, but did not significantly affect yield within planting dates”
e1“sweet sorghum yield”
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