Indices of tree susceptibility to bark beetles vary with silvicultural treatment in a loblolly pine plantation

摘要: Abstract We evaluated the effects of thinning and fertilization on eight indices susceptibility to insects in loblolly pine trees ( Pinus taeda L.) growing a 24-year-old plantation eastern Virginia, U.S.A. Resin flow rates, starch concentratons phloem, an index relative growth, bark phloem thickness all were greater thinned plots than control or fertilized plots. concentrations varied seasonally. Bark electrical resistance values treatments. Based association stocking densities with bark-beetle-induced mortality, is often recommended as silvicultural treatment reduce forest stands insects. This study demonstrates that affects many biochemical physical characteristics have been suggested predictors host susceptibilityto beetles.