Citrus Greening

• Huanglongbing, a bacteria transmitted by Asian Citrus Psyllid, results in greenish, miscolored, mishapen, and bitter fruits on infected trees

• The Asian Citrus Psyllid is close to the size of a gnat

• Adults, eggs, larvae or pupae may be on leaves or stems

Identifying Characteristics

Citrus GreeningRelationship between Bacteria and Psyllid

Tree infected with huanglongbing

(bacteria)

Carries huanglongbing to the

next feeding site

Psyllid feeds on infected tree

2

Citrus GreeningCommon Host Trees

Mandarin

Meyer LemonGrapefruit

• Lemon• Lime• Orange• Grapefruit• Pomelo

• Mandarin• Tangerine• Meyer

Lemon

3

Citrus GreeningMap – Range of Citrus Greening

American Elm

4

5

1. Leaves develop a yellow blotchy appearance

2. Sparsely leaved branches

3. Infected citrus trees produce fruits that are green and bitter

4. White waxy feeding residue from adult psyllids may be present

Citrus GreeningWhat to Look For

1

2

6

1. Leaves develop a yellow blotchy appearance

2. Sparsely leaved branches

3. Infected citrus trees produce fruits that are green and bitter

4. White waxy feeding residue from adult psyllids may be present

Citrus GreeningWhat to Look For

2

1

7

1. Leaves develop a yellow blotchy appearance

2. Sparsely leaved branches

3. Infected citrus trees produce fruits that are green and bitter

4. White waxy feeding residue from adult psyllids may be present

Citrus GreeningWhat to Look For

4

3

8

1. Leaves develop a yellow blotchy appearance

2. Sparsely leaved branches

3. Infected citrus trees produce fruits that are green and bitter

4. White waxy feeding residue from psyllid nymphs may be present

Citrus GreeningWhat to Look For

4

3

9

YEAR-ROUND: Leaves are blotchy, defoliation, green or bitter fruits,

misshapen fruits, white waxy residue

Citrus GreeningWhat to Look For (cont.)

10

Citrus GreeningAdditional Resources

USDAhttp://www.aphis.usda.gov/publications/plant_health/2011/CG-PestAlert.pdf

Hungry Pestshttp://www.hungrypests.com/the-threat/citrus-greening.php

EDDMaps: Reporting App for Smartphoneshttp://www.eddmaps.org/