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ViewAttendees 4

Student 10-Minute Paper

Plant-Insect Ecosystems

Student Competition

Student

Grad Competition P-IE: Vectors of Plant Disease

Identifying factors that influence cotton leafroll dwarf virus incidence in cotton agroecosystems

Monday, November 6, 2023
8:36 AM – 8:48 AM ET
Location: Gaylord National Resort & Convention Center, Chesapeake 2
In-Person Student Competition
Cotton leafroll dwarf virus (CLRDV) is found throughout most of the southern U.S. cotton belt and is transmitted by the cotton aphid, Aphis gossypii Glover. CLRDV has been reported to cause yield loss in cotton, but losses are not widespread. Initial data also suggests there is variation in CLRDV incidence across its geographic range, but this has not been characterized because the symptomology remains undefined and costly PCR-based testing is needed to detect asymptomatic infections. The goals of this study were to characterize variation in CLRDV incidence across distinct cotton agroecosystems in Alabama and Georgia, and to investigate what factors may be driving any observed variation. In 2021 and 2022, data on the number of A. gossypii, natural enemies, and CLRDV weed hosts were collected from 64 commercial cotton fields in Alabama and Georgia from mid-June to late-July when fields are first infested with A. gossypii. CLRDV incidence was determined using RT-PCR on samples collected from individual cotton plants sampled after cut-out in September of each year. Landscape composition data surrounding each field site will be collected from the 2021 and 2022 Cropland Data Layers (USDA National Agricultural Statistics Service CDL). Variation in CLRDV incidence ranged from 0-97.78% across the sampled area. Results from statistical analyses performed to demonstrate the causal relationships of CLRDV incidence using the collected data will be presented. The applied ecological and epidemiological aspects of these results will be discussed.