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Symptoms of Citrus Greening Infection

Citrus Greening

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Image of a commercial chicken hatchery.

Figure 1. Yellowing of a citrus shoot caused by citrus greening*

  Image of an Asian Longhorned beetle.

Figure 2. Presence of yellow shoots typical of citrus greening. Photo courtesy T.R. Gottwald and S.M. Garnsey.

         

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.*

         

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.

         

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.
 

 
         

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

     
         

Figure 11. Asian citrus psyllid, Diaphorina citri Kuwayama, in typical feeding position with raised abdomen. Image:David Hall, USDA-ARS, Ft. Pierce , FL

 

Figure 12. African citrus psyllid Trioza erytreae Del Guercio with eggs. Image:S. P. Van Vuuren, Citrus Research International, South Africa

 

 

Figure 13. Asian citrus psyllid, Diaphorina citri Kuwayama, nymphal instars. Image:David Hall, USDA-ARS, Ft. Pierce , FL
 

 

Figure 14. African citrus psyllid Trioza erytreae Del Guercio nymph. Image:Peter Stephen, Citrus Research International, South Africa

         

Figure 15. Asian citrus psyllid nymph. Image by Jeff Lotz, Florida DOACS, Division of Plant Industry.

     
         

 

Foliar Symptoms of Feeding by African Citrus Psyllid

     
         

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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