Figure 4
From: The spread of Carpophilus truncatus is on the razor's edge between an outbreak and a pest invasion
Survey area of monitoring activities in 2019–2020. On the left: position and types of sites where walnut fruits were sampled; infested sites (red) and uninfested sites (green). On the right: distribution and frequency of haplotypes; each circle represents an area of 3 km2 which includes multiple infested sites.
