| methyl jasmonate and oxalic acid treatment of norway spruce: anatomically based defense responses and increased resistance against fungal infection. | to study the effect of chemical pretreatment on conifer resistance, 13-year-old norway spruce (picea abies (l.) karst.) trees were treated with methyl jasmonate (mj) or oxalic acid (oxa) on the outer bark and inoculated with the pathogenic blue-stain fungus ceratocystis polonica (siem.) c. moreau 4 weeks later. both chemicals significantly reduced symptoms of fungal infection, but mj was more effective than oxa (51 versus 18% reduction in length of necrotic lesions in the phloem relative to untr ... | 2008 | 17938111 |