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Chapter Five
Hungry Planet: Stories of Plant Diseases

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C5.1. Soft rot in a potato tuber.		C5.2. Effects of fire blight, caused by Erwinia amylovora, in a pear orchard in Colorado (1914). The trees shown in the foreground were cut back after being infected. They had been the same size as the trees in the background.


C5.3. First observations of fire blight in Europe.		C5.4. Bacterial ooze on a pear with fire blight.


C5.5. Burning branches infected with fire blight.		C5.6. Citrus canker symptoms on leaves.


C5.7. A commercial chipping machine used to chip citrus trees infected by or exposed to citrus canker in urban Miami, Florida. .		C5.8. Lettuce with aster yellows disease caused by a phytoplasma.


C5.9. Witches' brooms in lime infected by a phytoplasma.		C5.10. Corn stunt disease caused by Spiroplasma kunkelii.


C5.11. Coconut palms. Left, healthy. Right, symptoms resulting from lethal yellowing, caused by a phytoplasma..		C5.12. Poinsettias. Left, natural growth habit of the poinsettia. Right, a poinsettia infected with a phytoplasma has a bushier and more attractive appearance.


C5.13. Oak leaves with a scorch symptom in a tree infected by Xylella fastidiosa.		C5.14. The undulating cell wall typical of Xylella fastidiosa (electron micrograph).


C5.15. The glassy-winged sharpshooter, a leafhopper vector of Xylella fastidiosa. This insect subsists on xylem fluid and often feeds upside down.		C5.16. Crown gall on euonymus caused by Agrobacterium tumefaciens.