Trees in the field trial were measured on 22 November, eight months after planting and more than 6 months following the first nematicide application. The heights of the IPC trees were 14% greater than those of uncovered trees (P=0.000) and trunk girth one inch above the bud union was 13% greater on covered than uncovered trees (NS). Nematicide treatment had no effect on the tree size. As noted previously, by summer the nematicides reduced the sting nematodes (P=0.02) by 87% on the uncovered trees and 13% on the covered trees. The apparent interaction for the nematicide effect was marginally significant (P=0.08). The final nematicide treatment of 2022 occurred in November and the effects on the winter population density will be measured in January. The first 16 rootstocks from the UF breeding program were evaluated for sting nematode tolerance during the first week of November, approximately 18 weeks after planting in nematode infested tanks. Compared to unchallenged trees, the root damage was readily evident on the most susceptible lines and was documented photographically for each plant in the trial. The average fibrous root mass of the infested compared to the the uninfested lines was highly correlated (0.80) with the subjective visual damage rating assigned each seedling and was used to rank the genotypes. The mean ratio of the average fibrous root mass infested/uninfested for the four most ‘tolerant’ lines was five-fold that of the four least tolerant lines. Three of the most tolerant lines were derived from crosses between the same tetrazygotic parents and the fourth had 3 of the 4 ancestral genotypes. Two additional tanks were established in July and a 2nd trial was initiated using USDA rootstocks and a number of conventional rootstocks. The second trial will be completed in February 2023.