Susceptibility of Pure and Hybrid Stands of Pinus to Attack by Matsucoccus matsumurae in Japan (Homoptera: Coccoidea: Margarodidae)

Publisher Website
Google Scholar
Abstract
Studies were conducted in Japan during 1984 in pure and hybrid stands of Pinus species of the subsection Sylvestres to determine their relative susceptibility to Matsucoccus matsumurae (Kuwana). Survivorship of scale nymphs and fecundity of adults were significantly lower on the native Japanese pines P. densiflora and P. thunbergiana and on their interspecific hybrid than on several pure and hybrid pines of related exotic species. Maternal parents of Japanese species did not confer resistance upon the F 1 progeny that resulted from hybrid crosses with susceptible exotic species. Overall trends in scale survivorship in 10 pure and hybrid stands suggested a chemical basis for host suitability. However, interspecific variation in bark texture and significant differences in survivorship of nymphs in exposed and protected sites on bark indicated a physical basis for host resistance as well.