Plant Health
| Citrus Greening |
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| Symptoms of Citrus Greening Infection | |||||
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Figure 1. Yellowing of a citrus shoot caused by citrus greening* |  |
Figure 2. Presence of yellow shoots typical of citrus greening. Photo courtesy T.R. Gottwald and S.M. Garnsey. | ||
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Figure 3. Close-up of one leaf showing vein yellowing and mottle.* |  |
Figure 4. Vein yellowing in a greening-infected leaf (top); normal leaf on bottom.* | ||
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Figure 5. Symptoms of Citrus Hunglongbing (greening) in Florida . The symptoms are characterized with yellow mottles, and vary from different host plants. A: Sour orange (Citrus aurantium) ; B: Lime (Citrus aurantifolia) ; D: unknown (Citrus sp.); C, E, and F: Pummelo ( C. maxima) . Image by Xiaoan Sun, Florida DOACS, Division of Plant Industry. |  |
Figure 6. Citrus greening on Citrus (probably hysti). Image by Xiaoan Sun, Florida DOACS, Division of Plant Industry. | ||
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Figure 7. Citrus greening on pommelo. Image by Xiaoan Sun, Florida DOACS, Division of Plant
Industry. |  |
Figure 8. Citrus greening on sour orange. Image by Xiaoan Sun, Florida DOACS, Division of Plant
Industry. |
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Figure 9. Symptoms of citrus greening on mandarin orange fruit. Photo courtesy T.R. Gottwald and S.M. Garnsey. |  |
Figure 10. Zinc deficiency symptoms in citrus.* | ||
| Insect Vectors of Citrus Greening | |||||
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Figure 11. Asian citrus psyllid, Diaphorina citri Kuwayama, in typical feeding position with raised abdomen. Photo courtesy of David Hall, USDA-ARS, Ft. Pierce , FL |  |
Figure 12. African citrus psyllid Trioza erytreae Del Guercio with eggs. Photo courtesy of S. P. Van Vuuren, Citrus Research International, South Africa | ||
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Figure 13. Asian citrus psyllid, Diaphorina citri Kuwayama, nymphal instars. Photo courtesy of David Hall, USDA-ARS, Ft. Pierce , FL |
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Figure 14. African citrus psyllid Trioza erytreae Del Guercio nymph. Photo courtesy of Peter Stephen, Citrus Research International, South Africa | ||
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Figure 15. Asian citrus psyllid nymph. Image by Jeff Lotz, Florida DOACS, Division of Plant Industry. | ||||
| Foliar Symptoms of Feeding by African Citrus Psyllid | |||||
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Figure 16. Citrus leaves, top view, showing pit galls produced by African citrus psyllid, Trioza erytreae Del Guercio. FAO website |  |
Figure 17. Close up of citrus leaves showing pit galls produced by African citrus psyllid, Trioza erytreae Del Guercio. FAO website | ||
| *From: http://www.doacs.state.fl.us/pi/enpp/germplasm/exotics.html | |||||
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