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Gall initiation success and fecundity of Dasineura marginemtorquens on variable Salix viminalis host plants

Glynn, Carolyn, Larsson, Stig
Entomologia experimentalis et applicata 1994 v.73 no.1 pp. 11-17
Dasineura, Salix viminalis, adults, biomass production, body size, fecundity, field experimentation, genotype, host plants, insects, laboratory experimentation, larvae, mortality, neonates, shoots, willows
Genotypic and environmentally determined differences in Salix viminalis L. suitability for Dasineura marginemtorquens (Bremi) (Diptera: Cecidomyiidae) growth and survival were investigated in laboratory and field experiments. Earlier studies have documented high neonate larval mortality on certain S. viminalis genotypes. Here we present results from laboratory experiments which show no difference in larval establishment behaviour on resistant and susceptible willow genotypes. These data indicate that larvae are not able to detect the plant characteristic responsible for resistance. In a field study insect performance was measured on willow shoots of dissimilar size. Adult body size was positively correlated to willow shoot length. In turn, body size was positively correlated to potential fecundity. These results are discussed in relation to observed high densities of D. marginemtorquens in vigorously growing willows cultivated for biomass production.