Investigating the effects of planting date and Aphis gossypii management on reducing the final incidence of cotton leafroll dwarf virus. (August 2022)

• Record Type: Journal Article
• Authors: Mahas, John W.; Hamilton, Fredericka B.; Roberts, Phillip M.; Ray, Charles H.; Miller, Gary L.; Sharman, Murray; Conner, Kassie; Bag, Sudeep; Blythe, Eugene K.; Toews, Michael D.; Jacobson, Alana L.
• Is Part Of: Crop protection. Volume 158(2022)
• Publication Date: 2022-08
• Subjects: Solemoviridae -- Polerovirus -- Aphididae -- Hysteroneura setariae; Plants, Protection of -- Periodicals; 632.05
• DOI: 10.1016/j.cropro.2022.106005
• Languages: English
• ISSNs: 0261-2194

Abstract

Abstract: This is the first study to research management strategies for cotton leafroll dwarf virus (CLRDV) in the southeastern U.S. The efficacy of aphid vector management to reduce final CLRDV incidence was investigated concurrent with efforts to monitor aphid population dynamics and timing of CLRDV spread. Adjusting the planting date and insecticide applications did not reduce the final incidence of CLRDV, which was confirmed in 60–100% of plants per plot using RT-PCR. Aphid population density was reduced, but not eliminated with foliar insecticide applications. Aphis gossypii was the only species observed on cotton and was the dominant species collected in pan traps. Three distinct periods of virus spread were detected with sentinel plants including early, mid-and late-season. Most virus spread occurred during large aphid dispersal events. Graphical abstract: The magnitude and timing of virus spread by aphids will impact the efficacy of vector management for reducing the final incidence of cotton leafroll dwarf virus (CLRDV). Image 1 Highlights: The cotton aphid, Aphis gosypii, was the most abundant aphid species observed. Insecticide applications did not prevent aphid colonization or decrease CLRDV incidence. Adjusting the planting date did not reduce final CLRDV incidence. CLRDV spread was detected early, mid and late-season using sentinel plants.