|Data for the most recent survey in each State was compared to data from
the next-to-last survey (tables 1-8) to examine changes in host
acreage and rust infection over time. Changes in acreage on a percentage basis are
presented in tables 9-14. Host acreage southwide had increased by
about 4.3 million acres from the previous survey--a 10-percent increase (table 1). The proportions by ownership categories changed little.
for both natural and planted stands, slash pine acreage had decreased slightly (-6
percent) while loblolly pine acreage had increased (+16 percent) between the 2 most recent
surveys (tables 9, 12). For both
species, planted acreage increased (+7 percent for slash pine, +44 percent for loblolly
pine; tables 10 and 13) while
natural acreage decreased (-24 percent for slash, -14 percent for loblolly; tables 11 and 14) over the period between
surveys. The number of acres with >10-percent infection did not follow these
trends (tables 9-14). For planted slash pine, infected acreage
decreased 3 percent while infected acreage of natural slash pine increased 1 percent.
Similarly, planted loblolly acreage with >10-percent infection decreased 7
percent while infected acreage in natural stands decreased 3 percent. Changes in acreages
at the >30-percent and > 50-percent infection levels followed somewhat
similar patterns regionwide. Changes at all levels varied from State to State (tables 9-14).