Georgia FORESTRY USPS No. 21 7120 Winter 1991 No.4 Vol. 45 STAFF Howard E. Bennett, Editor William S. Edwards, Asso. Editor Jackie N. Cundiff, Graphic Artist Bob Lazenby, Technical Advisor Zell Miller, Governor John W. Mixon, Director BOARD OF COMMISSIONE RS Jim L. Gillis, Jr., Chairman, Soperton Felton Denney, Carrollton James Fendig, Savannah Dr. Gloria Shatto, Rome Robert Simpson, Ill, Lakeland DISTRICT OFFICES District One 3086 Martha Berry Hwy.. NE/Rome. GA 30161 District Two 3005 Atlanta Hwy./Gainesville. GA 30501 District Three 1055 E. Whitehall Rd./Athens. GA 30605 District Four 184 Corinth Rd/ ewnan. GA 30263 District Five 119 Highway 49/Milledgeville. GA 31061 Di trict Six 1465 Tygnall Rd./Wa hington . GA 30673 District Seven Route 1, Box 23A/Americus, GA 31709 District Eight Route 3. Box 17/Tifton, GA 31794 District Nine P.O. Box 345/Camilla . GA 31730 District Ten Route 2. Box 28/Statesboro. GA 30458 District Eleven Route 1, Box 67/Helena. GA 31037 District Twelve 5003 Jacksonville Hwy./Waycross. GA 31501 Urban Forestry 6835 Memorial Drive Stone Mountain, GA 30083 Georgia Forestry is published quarterly by the Georgia Forestry Commission, Route 1, Box 181, Dry Branch, GA 31020. Second class postage paid at Macon, GA POSTMASTER; Send address changes to Georgia Forestry Commission, Route 1, Box 181, Dry Branch, GA 31020. The shedding of leaves is another of nature's wise provisions for winter. Broad leaf trees of the north shed their leaves and, as a result, their branches will more easily bear the winter's burden of snow and ice. In the southern states where there is no now or ice, orne broadleaf tree are practically evergreen. The conifers- pines, spruces, cedars, firs and hemlocks- have no definite time for leaf shedding. Th eir leaves are either needle or scalelike - a form adapting them to the shedding of snow. Through fallen leaves, nature has also provided for a fertile forest floor. Although the food prepared in the cell cavities of the leaves is returned to the tree in the fall, mineral substances with which the walls of the cells have become impregnated during the summer month are retained. Therefore, fallen leaves contain relatively large amounts of valuable elements, such as nitrogen and phosphorus, which were originally a part of the soil. Decomposition of the leaves enriches the top layers of the soil by returning the elements borrowed by the tree and at the ame time provides for an accumulation of water-ab orbing humus. ON THE COVER- Thi swooden bridge in ruraiGeorgiaisoneof everal built or in the planning stage under a cooperative effort to replace defective span s on secondary roads. The Georgia Forestry Commission is working with the U. S. Forest Service and county officials on the project which emp loys new engineering techniques in the wood brid ge construction. (Photo By Billy Godfrey! GYPSY MOTH NOT YET SERIOUS THREAT TO GEORGIA n isolated population of gypsy moths has been documented in White County and the infestation covers approximately 5000 acres in land around Dukes Creek, accordin g to Terry Price, the Commission's Entomologist. The gypsy moth is a hardwood defoliator that was introduced in Massachusetts from Europe over a century ago. Since that time it has thrived and continues to expand its range west and south . Currently, all of the northeastern states and portions of Michigan, Ohio, West Virginia, Virginia and North Carolina are considered generally infested and came under quarantine regulations. Total acreage treated fluctuates from year to year, but in 1990 a total of 1.4 million acres were treated to prevent or reduce impact s from gypsy moth at a total cost of about $25 million . Since the adult female gypsy moth cannot fly, the natural spread of gypsy moth south and we t from the quarantine area is relatively slow. " Based on historical data, if this moth continues to pread at the same rate (15 miles per year) it wi ll be 20 to 30 years before the advancing front of gypsy moth populations envelop North G orgia and wid espread defoliation requi re yearly uppression efforts," Price aid. The Entomologist exclai med, however, that th moth i so easily transported by man that isolated infe tations, uch a the one in White County, becam e tablished "as the result of long distance, man-cau ed spread." He said moth deposit eggs on all sort of obj cts and egg masses have b en foun on mobile homes, cars, trucks, boats and trailers, pop-up tents, firewood and patio furniture. People unknowingly tran port the egg At Present Rate, It Will Be "20 to 30 Years" Before Advancing Front Of Population Reaches North Georgia. masses when leaving infested states to travel cross country. The Commission uses pheromone baited trap s to locate isolated infestations that re ult from the movement of people. White County has been o ne of many counties in Georgia that ha been intensively trapp ed since 1986. Due to the trapping, th e personnel have been abl e to locate the curren t smal l infe tation. Price aid plans are underway to treat approximately 5,000 acres of wood lands with BT (Ba cillus thuringiensis), co nsidered one of the safe t gypsy moth con trol/eradication products available. The material is a naturally occu rin g bacteri um th at w hen ing ted by caterpillar even tually kills them. Th e Commission ha begun to inform residents of White County of the erad ication treatment to begin in April of 1992. Erad ication is timed with the caterpillar emergence in the spring. Th e project will be a joint effort of the Commission and the U. S. Fore t Service. If the eradication is successful Georgia may very well be free of the pest until the advancing front arrives sometime after the turn of th e century. Cporqia orpctn,(\Aiintpr 1QQ1 /3 BALSAM FIR CAN BE GROWN AT A PROFIT IN GEORGIA Dillard inspects trees ready for the Christmas market. A orth Georgia Tree Farmer now has marketable proof that the highly profitable balsam fir can be commercially grown in certain sections of th e tate for the Chri tmas tree market. Fifteen years ago Malcolm Dillard planted an experim ental crop of balsam fir in Rabun County, located in the northeastern tip of Georgia bord ering _orth Carolina. At the time, it was unheard of to grow balsam fir co mmercially in Geo rgia, but Dillard is an innovative fore ter and wanted to tap the Christmas tree market with a popu lar species. Some peopl e told him t hat it could not be done; oth ers to ld him it was not worth the long range speculation to be a pioneer. During this Christmas sea on, a crop of balsam fir grown on Dillard's property was tru cked to Florida and averaged ell ing at a high retail price. Several North Georgia Christmas tree farmers followed Dillard's encouragement and are now uccessfully growing balsam fir. The bal am fir that went to thi a/Gggpia focg stg