Missouri is almost one-third forested. There are about 14 million acres of forest land, an increase of 10% since 1972. The eastern Ozarks have 67% of the State's forest land. In addition to recreation and wildlife benefits these forests provide, the latest statistics indicate the value of forest products produced annually exceeds $3.3 billion. There are over 2,600 firms employing more than 33,000 people with a payroll of about $500 million per year. In 1994, 709 million board feet were cut, 90% was oak, with a stumpage value of about $109.5 million.
Drought - The weather in 1999 continued to be a dominant factor in forest health concerns in Missouri, as it has in recent years. Dry weather conditions began to develop in mid-July and continued into October. By late August, drought conditions existed over most of the state, but were most serious in southern and eastern Missouri. The leaves on many deciduous trees browned and dropped by late August, appearing like an early autumn. A number of conifers (particularly white pine) had needle damage that resembled winter injury. Although wildfires most commonly occur in early spring in Missouri, numerous wildfires burned in southern and eastern Missouri during October and November.
|The immediate impact of drought conditions can be expected to cause mortality of some young trees or recently planted or previously stressed trees that did not receive supplemental water. But impacts of the 1999 drought also can be expected to extend for the next several years. This kind of weather can be a significant factor in the onset of decline. Trees stressed this year by the drought are more susceptible to many other damage agents in the next few years, particularly if the trees were growing on poor sites or had been stressed by other factors.|
| Oak leaf drop - A mysterious type of damage appeared in
mid-summer among a large number of mature trees in the white oak group (white,
bur, post, chinkapin). Leaves throughout the entire tree crown developed
varying levels of mottling and quickly dropped from the affected tree. These
symptoms were evident prior to the onset of this year's drought conditions.
Numerous samples from affected trees were examined for oak wilt, but none was
found. One explanation suggested for this phenomenon involves the very mild
winters of the past two years and particularly warm temperatures in February.
The unusual weather at that time may have caused damage to vessels maturing in
buds or starting to develop in spring wood. Leaves may have then aborted later
in the year, when they begin to rely on new sapwood vessels, or when the
weather turned hot and water movement became critical. However, this hypothesis
has not been proven. Affected trees will likely recover, although the leaf drop
phenomenon is another stress factor compounding the effects of this year's
|Gypsy moths - The Missouri Cooperative Gypsy Moth Survey placed and monitored more than 12,000 traps throughout the state in 1999 in the annual effort to detect the presence of gypsy moths. A total of 13 moths were captured statewide. Ten moths were caught in the St. Louis metropolitan area (St. Louis and St. Charles Counties) and one moth each was caught in Clay, Laclede, and Taney Counties. Some of the gypsy moth captures were near locations where moths have been caught in the past. A few moths are captured every year around St. Louis and near vacation and recreational sites in Taney County. Large volumes of interstate traffic traveling to those areas provide opportunity for gypsy moths to hitchhike into the state.|
|One moth was captured in Laumeier Park in St. Louis, where eight
moths were trapped in 1998. Three moths captured in St. Charles County were
apparently a result of infested nursery stock that had been shipped there from
the Northeastern U.S. The Taney County capture site is in the same area where
gypsy moths were caught in 1997 and 1998. In spite of the repeated moth
captures, there are no known populations of gypsy moths in Missouri at this
time. However, the risk of gypsy moths establishing in Missouri continues to
increase as infested areas in nearby states expand.
|Forest Health Monitoring - In 1999, Missouri joined the
national Forest Health Monitoring (FHM) program. The purpose of the program is
to measure changes in forest health over time and evaluate those forest health
issues that impact on the sustainability of our forests. A network of 282 FHM
plots has been established in Missouri based on a national survey grid.
Currently 116 of those plots have a forested condition. A portion of the plots
will be remeasured each year during summer months. Results of the annual
surveys will be compiled with those from other states to examine forest health
issues on a national or forest type basis.
For more information contact:
Jefferson City, MO 65102
|Forest Health Protection
State & Private Forestry
USDA Forest Service
1992 Folwell Avenue
St. Paul, MN 55108
|Updated: December 1999.......|
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