Journal
INTERNATIONAL JOURNAL OF PEST MANAGEMENT
Volume 67, Issue 1, Pages 10-19Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09670874.2019.1660830
Keywords
Invasive insect; flupyradifurone; planting date; action threshold; plant injury
Categories
Funding
- area-wide pest management project entitled 'Area-Wide Pest Management of the Invasive Sugarcane Aphid in Grain Sorghum' [6602-21220-017-00D]
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This study evaluated the resistance of five commercially available grain sorghum hybrids to sugarcane aphid, and the effectiveness of foliar insecticide applications. Results showed that 'DKS48-07' and 'DKS37-07' were resistant, while 'KS585' and 'DKS53-53' were highly susceptible. A single application of flupyradifurone suppressed sugarcane aphid populations effectively.
Sugarcane aphid, Melanaphis sacchari (Zehtner), recently emerged as a severe economic pest of sorghum in the USA. This insect was first discovered in the USA feeding on grain sorghum in Texas in 2013 and then rapidly spread across 19 additional states. In order to develop management practices to prevent yield loss, the objective of this study was to assess the value of host plant resistance and foliar applications of insecticide in five commercially available grain sorghum hybrids, across five locations in the southeastern USA. Field experiments were conducted in 2017 in Tift, Peach, and Pike Counties in Georgia; Barbour County in Alabama; and Darlington County in South Carolina. Foliar flupyradifurone applications were initiated at the action threshold of 50 aphids per leaf for each hybrid. Grain sorghum hybrids 'DKS48-07' and 'DKS37-07' showed resistance to M. sacchari across study locations. The most resistant variety, 'DKS48-07', required no foliar insecticide. Conversely, hybrids 'KS585' and 'DKS53-53' were highly susceptible. A single foliar application of flupyradifurone immediately suppressed M. sacchari populations and no further treatments were required.
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