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Download Publication ID: 3824A
Figure 1. This random dieback of twigs with light tan-colored foliage is caused by boxwood dieback.
Figure 2. The roots and crowns of boxwood plants infected by Colletotrichum theobromicola appear healthy.
Figure 3. A Baby Gem boxwood (Buxus microphylla) infected with boxwood dieback caused by Colletotrichum theobromicola </i>exhibits early symptoms of light green foliage in the middle of the canopy.
Figure 4. Acervuli (fruiting bodies, at yellow arrows) of Colletotrichum theobromicola erupting through the epidermis of an infected boxwood stem.
Figure 5. This bright black discoloration of the upper part of the boxwood stem under the bark is caused by Colletotrichum theobromicola.
Figure 6. This bright black discoloration of the lower part of the boxwood stem under the bark is caused by Colletotrichum theobromicola.
Figure 7. Bright-black discoloration under the bark of the same boxwood stem as shown in Figure 4 caused by Colletotrichum theobromicola.
Figure 8. A cross section of a symptomatic boxwood twig infected with boxwood dieback shows discoloration extending to the center of the woody tissue.
Figure 9. This boxwood leaf lesion is caused by Colletotrichum theobromicola.
Figure 10. These are foliar symptoms of boxwood plants infected with Phytophthora root rot.
Figure 11. Boxwood blight is caused by Calonectria pseudonaviculata. Photo by V. L. Smith, Connecticut Agricultural Experiment Station.
Figure 12. This boxwood is infected with Macrophoma blight.
Figure 13. This boxwood is infected with Volutella blight.
Figure 14. These foliar symptoms are caused by high temperature in a greenhouse.
Figure 15. These foliar symptoms are caused by cold injury. Photo by Mary Ann Hansen, Virginia Tech.
Figure 16. These foliar symptoms are caused by herbicide injury.
P3824A_BoxwoodDiebackFactSheet_RH1021_RSinghpdf / 4.45MB