@article{powell_campbell_1983, title={HISTOLOGICAL EXAMINATION OF LARVAL CLOVER ROOT CURCULIO (COLEOPTERA, CURCULIONIDAE) DAMAGE TO LADINO WHITE CLOVER}, volume={76}, ISSN={["0022-0493"]}, DOI={10.1093/jee/76.4.741}, abstractNote={Characteristic Sitona hispidulus (F.) larval root wounds on six genotypes of Ladino clover were histologically examined to determine average tissue penetration of curculio wounds. No differences in tissue penetration were found among the six genotypes. Wounds in zone 1 (root region 0 to 2.5 cm below soil surface) were deeper than those in zone 2 (root region 2.5 to 5 cm below soil surface), but this was not reflected in the wound scores. ‘Tillman’ was the only genotype to incur wounds which penetrated into the xylem. Most root wounds found on ‘Tillman’ in zone 1 were significantly deeper than wounds found on the other five genotypes (zones 1 and 2). A negative correlation (r = −0.79) was found between cellulose fiber density in the cortex and phloem regions and depth of root tissue penetration for five of the six genotypes. The sixth genotype possessed low fiber density and a shallow wound score.}, number={4}, journal={JOURNAL OF ECONOMIC ENTOMOLOGY}, author={POWELL, GS and CAMPBELL, WV}, year={1983}, pages={741–743} }