Article Figures & Data
Figures
- Fig. 1.
An affected tree exhibiting advanced stages of the pine blue-stain disease in May 1981. At this stage extensive blue-staining in the wood of the trunk and branches can be observed. The pinewood nematode may also be present in many of the branches having needle browning.
- Fig. 2.
Wood discoloration in cross-section is wide in the sapwood and extends sometimes to the center of the affected trunk or branch. The individual blue streaks usually extend for several meters in the sapwood of trees exhibiting early symptoms of the blue-stain disease.
- Fig. 3.
The ascospores of the Ceratocystis ips fungus have a characteristic gelatinous sheath and short flanges at the ends of the spores. (Enlargement of a picture taken through a phase microscope at 500× magnification.)
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