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Dormant branches of Fraser fir (Abies fraseri (Pursh) Poir.) Christmas trees were subjected to single doses of gamma radiation at levels ranging from 0 to 5.0 kGy (0 to 500 kRad). Significant needle loss resulted at doses ≥0.10 kGy and increased with radiation intensity. Irradiation discolored foliage and accelerated drying. Irradiation does not appear to be a viable way to meet insect quarantine requirements on cut Fraser fir Christmas trees. About 36 million live Christmas trees are sold annually in the United States (Baumann, 1992), and growth in the international market is also increasing. Live Christmas trees harbor insect pests, and disinfestation procedures will be required to meet import regulations of for- eign markets. Fraser fir is an important Christmas tree species in North America, and since it will be exported in greater quantity in the future, information is needed on quarantine treat- ments. Fraser fir is relatively tolerant of me- thyl bromide (G.A. Chastagner et al., unpub- lished data; U.S. Dept. of Agriculture, 1977), but information concerning its response to radiation is lacking. Since balsam fir (Abies balsamea L.), a closely related species, is relatively sensitive to chronic, low-level doses of gamma radia- tion (Dugle, 1986), we examined postharvest quality of gamma-irradia ted Fraser fir

Gamma Radiation Unpromising as an Insect Quarantine Treatment for Fraser Fir Branches