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Genomic loci related with resistance to gall-inducing insects have not been identified in any plants. Here, association mapping was used to identify molecular markers for resistance to the gall wasp  Leptocybe invasa  in two  Eucalyptus  species. A total of 86 simple sequence repeats (SSR) markers were screened out from 839 SSRs and used for association mapping in  E .  grandis . By applying the mixed linear model, seven markers were identified to be associated significantly ( P  ≤ 0.05) with the gall wasp resistance in  E .  grandis , including two validated with a correction of permutation test ( P  ≤ 0.008). The proportion of the variance in resistance explained by a significant marker ranged from 3.3% to 37.8%. Four out of the seven significant associations in  E .  grandis  were verified and also validated ( P  ≤ 0.073 in a permutation test) in  E .  tereticornis , with the variation explained ranging from 24.3% to 48.5%. Favourable alleles with positive effect were also mined from the significant markers in both species. These results provide insight into the genetic control of gall wasp resistance in plants and have great potential for marker-assisted selection for resistance to  L .  invasa  in the important tree genus  Eucalyptus .

The first identification of genomic loci in plants associated with resistance to galling insects: a case study in Eucalyptus L'Hér. (Myrtaceae)