Research Brief: High Tunnel Study Reveals Key Challenges and Solutions
April 23, 2025 A recent study of Kentucky high tunnel vegetable growers offers insights into production challenges and effective management strategies for these types of structures in this region. Researchers from the University of Tennessee and University of Kentucky surveyed 122 growers operating 197 high tunnels across 60 Kentucky counties.
The survey identified aphids, whiteflies, and spider mites as the most prevalent pests, while crabgrass, morning glory, and chickweed topped the list of troublesome weeds. Notably, many growers reported uncertainty about soilborne diseases and nematodes (roundworms), with nearly 40% unaware if they had nematode problems, despite separate research indicating they’re widely present.
Hand weeding proved the most common management practice, used by 95% of growers. While insecticides and fungicides were also popular, soil solarization—though used by only 19% of respondents—received the highest satisfaction rating. This technique uses transparent plastic to trap solar heat, raising soil temperatures to levels that kill pathogens, nematodes, and weed seeds.
The study found younger, more experienced growers who follow organic practices were more likely to adopt soil solarization. Among non-users, 70% expressed willingness to try it, primarily attracted by its environmental benefits and potential effectiveness.
The high tunnel study suggests that improving identification skills for diseases and nematodes is crucial, as is considering soil solarization as an effective management option. Researchers note that the University of Kentucky Plant Disease Diagnostic Laboratory offers free diagnostic services that can help growers make more informed management decisions.
The study appears in the April 2025 issue of HortTechnology.