ALT Map of the distribution of southern root-knot nematode in the U.S.

ALT Corn leafhopper close-up on leaf.

ALT 10 round cysts in shades of tan and brown, on a white potato root

ALT Fig. 2. Maps display the geospatial distribution of Heterodera glycines egg population densities. Maps were created using inverse distance weighting interpolation analysis at three locations in Ohio: Western Agricultural Research Station (WARS) (A and B), Fulton-1 (C and D), and Fulton-2 (E and F), during the fall of 2022 and 2023. Soil samples were collected either automatically through an automated precision soil sampler (A, C, and E) or manually using a stainless soil probe (B, D, and F). The color gradient on the maps (ranging from red to blue) illustrates varying levels of H. glycines egg population densities, with red indicating higher densities and blue indicating lower densities. The black dots represent the soil samples used for objective 1, whereas the white triangles represent the soil samples used for objectives 2 and 3. SCN = soybean cyst nematode.