Adaptation to upland soils was investigated in a diallel study involving progeny of 4 blueberry (Vactinium) clones consisting of 1 highbush blueberry (V. corymbosum L.) clone and 3 interspecific hybrids. Both general and specific combining ability were significant. Seedling progenies of NJUS 11 (V. ashei × V. atrococcum) and US75 (V. darrowi × V. corymbosum) grew well on an upland soil. Although not included in the diallel crosses, NJUS 64 (V. myrsinites × V. angustifolium) progenies also grew well on upland soil.
Graduate Research Assistant. Present address: Dept. of Hort., Ohio Agr. Res. and Dev. Ctr., Wooster, OH 44691.
Received for publication 6 June 1984. Scientific article no. A-3902 and contribution no. 6883 of the Maryland Agr. Expt. Sta., Dept. of Hort. Submitted by the senior author as part of a thesis in partial fulfillment of the requirements for the PhD degree. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.