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Video Q&A ViewAttendees 2

Plant-Insect Ecosystems

Section Symposium

Ecology, Epidemiology, and Management of Whiteflies and Whitefly-transmitted Viruses On-Demand Presentations

Assessment of the spatial and temporal distribution of whitefly-transmitted cucurbit leaf crumple disease in yellow squash planted in southern Georgia

On-Demand
On-Demand
A two-year study (2019 and 2020) was conducted to characterize the spatio-temporal distribution of cucurbit leaf crumple disease caused by the whitefly-transmitted virus complex; cucurbit leaf crumple virus (CuLCrV) and cucurbit yellow stunting disorder virus (CYSDV) in yellow squash (Cucurbita pepo) fields in southern Georgia. The studies were conducted both at the small-scale (field trials) and at the large-scale (commercial fields). For both the small-scale and larger scale studies across two years, we observed a typically random distribution of symptomatic plants early in the growing season based on “ordinary runs analysis”. As the season progressed, the distribution of infected plants became aggregated (Z< -1.64). Spatial distribution of symptomatic plants was determined by calculation of Moran’s I and Ia values using spatial autocorrelation and spatial analysis by distance indices (SADIE). Moran’s I and Ia values increased over time indicating a shift from random to aggregated patterns (Moran’s I>0 and P < 0.05, Ia>1 and P < 0.05) in both the small-scale and larger scale studies. Heat maps generated from Ia values had a noticeable edge effect on the spatial distribution of symptomatic plants in fields assessed. An understanding of the edge effect of symptomatic plants and the shift from random to aggregated distribution are considerations for refining current management strategies.