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Citrus Diseases

 

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04CSD.jpg Citrus stubborn disease (CSD)

Leaf chlorosis and branch dieback.

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05CSD.jpg Citrus stubborn disease (CSD)

Leaf chlorosis.

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06CSD.jpg Citrus stubborn disease (CSD)

Fruit drop.

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08CSD.jpg Citrus stubborn disease (CSD)

Stunted tree.

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09CSD.jpg Citrus stubborn disease (CSD)

Tree exhibiting irregular flowering.

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10CSD.jpg Citrus stubborn disease (CSD)

Top row- unaffected seeds; bottom row- seeds affected by CSD.

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11CSD.jpg Citrus stubborn disease (CSD)

Barnfield Navel Carrizo tree showing severe stunting and tip dieback.

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12CSD.jpg Citrus stubborn disease (CSD)

Barnfield Navel tree showing bunchy growth and leaf chlorosis.

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13CSD.jpg Citrus stubborn disease (CSD)

T1 Navel Carrizo tree showing stunting and premature fruit drop.

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14CSD.jpg Citrus stubborn disease (CSD)

Leaves affected by CSD.

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15CSD.jpg Citrus stubborn disease (CSD)

T1 Navel fruit; far right uninfected; others infected with CSD.

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16CSD.jpg Citrus stubborn disease (CSD)

T1 Navel fruit: right group uninfected; left group infected with CSD.

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17CSD.jpg Citrus stubborn disease (CSD)

T1 Navel tree showing mature fruit and off season flowering.

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variegated_chlorosis01.jpg Citrus variegated chlorosis (CVC)

Whole-tree symptoms.

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variegated_chlorosis02.jpg Citrus variegated chlorosis (CVC)

Fruit symptoms.

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variegated_chlorosis03.jpg Citrus variegated chlorosis (CVC)

Close-up of fruit symptoms.

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variegated_chlorosis04.jpg Citrus variegated chlorosis (CVC)

Symptoms on top side of leaf.

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variegated_chlorosis05.jpg Citrus variegated chlorosis (CVC)

Symptoms on underside of leaf.

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variegated_chlorosis06.jpg Citrus variegated chlorosis (CVC)

Close-up of lesions on underside of leaf.

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CVC_Alexander_Purcell_University_of_California_Bugwood.org_cs.jpg Citrus variegated chlorosis (CVC)

Fruit and leaf symptoms - CVC affected fruit and leaves on left. Unaffected fruit and leaves on right.

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CVC_2Alexander_Purcell_University_of_California_Bugwood.org_cs.jpg Citrus variegated chlorosis (CVC)

Leaf symptoms.

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CVC_3Alexander_Purcell_University_of_California_Bugwood.org_cs.jpg Citrus variegated chlorosis (CVC)

Regular size fruit on left, CVC affected fruit on right.

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Greasyspotfield.jpg Greasy spot

Leaf symptoms of greasy spot.

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greasyspotsample.jpg Greasy spot

A leaf sample with greasy spot.

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GSLEAF_TG_cs.jpg Greasy spot

Leaf symptoms of greasy spot.

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GSLEAVES_TG_cs.jpg Greasy spot

Leaf symptoms of greasy spot.

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RINDBLOT_TG_cs.jpg Greasy spot

Necrotic specks on fruit.

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RINDBLO2_TG_cs.jpg Greasy spot

Close-up of necrotic specks on fruit.

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31HLB.jpg Huanglongbing (HLB)

Sweet orange fruit showing the color inversion symptom.

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04HLB.jpg Huanglongbing (HLB)

Small lopsided fruit with dark seeds and rind that does not color properly.

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27HLB.jpg Huanglongbing (HLB)

Lopsided fruit showing seed abortion and stain of the vascular columella.

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28HLB.jpg Huanglongbing (HLB)

Close-up of the stained vascular columella of a lopsided fruit.

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29HLB.jpg Huanglongbing (HLB)

Close-up of aborted seeds.

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01HLB.jpg Huanglongbing (HLB)

Close-up of yellow shoot on tree.

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02HLB.jpg Huanglongbing (HLB)

Yellowing of a quadrant of a citrus tree due to greening.

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03HLB.jpg Huanglongbing (HLB)

Leaf chlorosis on citrus due to greening.

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05HLB.jpg Huanglongbing (HLB)

HLB leaf symptoms on the citrus relative Severinia buxifolia.

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06HLB.jpg Huanglongbing (HLB)

Leaf symptoms - top surface of Citrus aurantium (sour orange) showing classic HLB mottling.

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07HLB.jpg Huanglongbing (HLB)

Leaf symptoms - bottom surface of Citrus aurantium (sour orange) showing classic HLB mottling.

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08HLB.jpg Huanglongbing (HLB)

Leaf symptom - asymmetrical pattern of the HLB mottling on Citrus macrophylla (alemow).

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09HLB.jpg Huanglongbing (HLB)

Mottling that crosses the leaf lateral veins.

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10HLB.jpg Huanglongbing (HLB)

Mottling that crosses the leaf lateral veins.

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11HLB.jpg Huanglongbing (HLB)

Mottling that crosses the leaf lateral veins.

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12HLB.jpg Huanglongbing (HLB)

Leaf symptom - HLB mottling progression on Citrus aurantifolia (Persian lime) - Early.

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13HLB.jpg Huanglongbing (HLB)

Leaf symptom - HLB mottling progression on Citrus aurantifolia (Persian lime) - Middle.

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14HLB.jpg Huanglongbing (HLB)

Leaf symptom - HLB mottling progression on Citrus aurantifolia (Persian lime) - Advanced.

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15HLB.jpg Huanglongbing (HLB)

Leaf symptom - HLB symptoms on Citrus maxima (pummelo).

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16HLB.jpg Huanglongbing (HLB)

Leaf symptom - classic mottling on Citrus reticulata (tangerine).

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17HLB.jpg Huanglongbing (HLB)

Leaf symptom - classic mottling on Citrus reticulata (tangerine), (top surface).

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18HLB.jpg Huanglongbing (HLB)

Leaf symptom - classic mottling on Citrus reticulata (tangerine), (bottom surface).

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19HLB.jpg Huanglongbing (HLB)

Leaf symptom - on Citrus hystrix (Kaffir lime).

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20HLB.jpg Huanglongbing (HLB)

Corky veins on Citrus aurantium (sour orange) leaf.

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21HLB.jpg Huanglongbing (HLB)

Corky veins on Citrus aurantium (sour orange) leaf.

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22HLB.jpg Huanglongbing (HLB)

Yellow vein of a HLB infected Citrus reticulata (tangerine) leaf.

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23HLB.jpg Huanglongbing (HLB)

Leaf symptom - green islands on Citrus sinensis (sweet orange).

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24HLB.jpg Huanglongbing (HLB)

Leaf symptom - zinc deficiency like symptoms.

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25HLB.jpg Huanglongbing (HLB)

Citrus maxima (pummelo) tree with yellow shoot sectors.

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26HLB.jpg Huanglongbing (HLB)

Citrus maxima (pummelo) tree showing dieback.

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30HLB.jpg Huanglongbing (HLB)

Notching on leaf resulting from the Asian citrus psyllid feeding damage.

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32HLB.jpg Huanglongbing (HLB)

Symptoms on tree shoot.

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01Leprosis.jpg Leprosis

Symptoms on fruit.

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28Leprosis.jpg Leprosis

Symptoms on fruit.

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03Leprosis.jpg Leprosis

Early symptoms on immature fruit.

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04Leprosis.jpg Leprosis

Symptoms on fruit.

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18Leprosis.jpg Leprosis

Symptoms on green fruit.

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05Leprosis.jpg Leprosis

Symptoms on fruit.

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25Leprosis.jpg Leprosis

Symptoms on fruit.

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35Leprosis.jpg Leprosis

Symptoms on fruit.

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29Leprosis.jpg Leprosis

Symptoms on fruit.

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06Leprosis.jpg Leprosis

Fruit drop.

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23Leprosis.jpg Leprosis

Lesions on stem.

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22Leprosis.jpg Leprosis

Lesions on stem.

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07Leprosis.jpg Leprosis

High magnification of lesions on the dead part of a branch.

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21Leprosis.jpg Leprosis

Lesions on stem.

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02Leprosis.jpg Leprosis

Close-up of lesions on the green part of a branch.

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36Leprosis.jpg Leprosis

Symptoms on stem.

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31Leprosis.jpg Leprosis

Lesions on stem and death of the distal part of the stem.

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27Leprosis.jpg Leprosis

Symptoms on green stem.

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11Leprosis.jpg Leprosis

Symptoms on leaf (top).

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12Leprosis.jpg Leprosis

Symptoms on leaf (bottom).

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08Leprosis.jpg Leprosis

Leaf symptoms.

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09Leprosis.jpg Leprosis

Symptoms on leaf.

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10Leprosis.jpg Leprosis

Symptoms on leaf.

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13Leprosis.jpg Leprosis

Symptoms on leaf.

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14Leprosis.jpg Leprosis

Symptoms on leaf (top).

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15Leprosis.jpg Leprosis

Symptoms on leaf (bottom).

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16Leprosis.jpg Leprosis

Symptoms on leaf and fruit.

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17Leprosis.jpg Leprosis

Leaf symptoms.

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19Leprosis.jpg Leprosis

Leaf symptoms.

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20Leprosis.jpg Leprosis

Older fully expanded leaf with fully developed lesions.

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24Leprosis.jpg Leprosis

Symptoms of chlorosis with brown gummy center and early symptoms on leaf petiole.

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26Leprosis.jpg Leprosis

Symptoms on fully expanded older leaf.

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30Leprosis.jpg Leprosis

Symptoms on mature leaf.

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32Leprosis.jpg Leprosis

Young leaf with what appears to be developing lesions.

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33Leprosis.jpg Leprosis

Leaf symptoms.

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34Leprosis.jpg Leprosis

Symptoms on leaf.

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keylimeanthracnose.jpg Lime anthracnose

Fruit lesions.

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MVC_081F_Lime_Anthracnose_leaf_and_fruit_lesions_key_lime_Dan_Robl_cs.jpg Lime anthracnose

Lime anthracnose symptoms. Shoot die-back and lesions on key lime leaf and fruit.

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keylimeonleaves.jpg Lime anthracnose

Leaf lesions.

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MVC_007F_Lime_Anthracnose_on_key_lime_leaf_Dan_Robl_cs.jpg Lime anthracnose

Lime anthracnose on key lime leaf (top surface).

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MVC_008F_Lime_Anthracnose_on_key_lime_leaf2_Dan_Robl_cs.jpg Lime anthracnose

Lime anthracnose on key lime leaf, (bottom surface).

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Picture1_Mal_secco_symptoms_on_a_Citrus_medica_branch_DE_cs.jpg Mal secco

Mal secco symptoms on a Citrus medica branch.

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Picture2_Mal_secco_sectorial_Branch_wilt_of_lemon_tree_in_Israel_DE_cs.jpg Mal secco

Mal secco sectorial branch wilt of lemon tree.

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Picture3_Leaf_yellowing_and_shading_and_branch_die_back_on_lemon_tree_in_Israel_DE_cs.jpg Mal secco

Leaf yellowing and shading and branch die back on lemon tree.

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Citrus Diseases
March, 2013