Severity and frequency of SO2-induced leaf necrosis on seedlings of 57 tree species

D. M. Umbach, D. D. Davis

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Container-grown seedlings or rooted cuttings of 57 tree species common in the northeastern United States were tested during 1977-80 to establish the severity and frequency of SO2-induced leaf necrosis for each species. Plants were exposed to 0.9 ppm SO2 (2,400 μg m-3) for 2 or 4 hr in controlled-environment chambers. Species were grouped into four sensitivity classes. For seven species considered highly sensitive, more than 40 percent of the individuals exhibited symptoms, and more than 4 percent of the leaf surface on a typical individual was necrotic on average. At the other extreme, eight species did not develop symptoms. The results are consistent with a direct relationship between a species's tolerance to SO2 and its shade tolerance.

Original languageEnglish (US)
Pages (from-to)587-596
Number of pages10
JournalForest Science
Issue number3
StatePublished - Jan 1 1984

All Science Journal Classification (ASJC) codes

  • Forestry
  • Ecology
  • Ecological Modeling


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