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Citrus Diseases

 

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0660093_Bugwood_G_Perrotta_Univsersita_di_Calabria_cs.jpg Mal secco

Lemon tree severely affected by mal secco.

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measles03.jpg Measles

Measles symptoms on leaf.

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measels01.jpg Measles

Close-up of measles lesions on leaf.

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Measles_Leaf_DSC07083a_HG_cs.jpg Measles

Measles symptoms on leaf.

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Measles_Leaf2_DSC07087a_HG_cs.jpg Measles

Measles leaf symptoms.

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Measles_Leaf3_DSC07093a_HG_cs.jpg Measles

Measles leaf symptoms.

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Measles_Leaf4_DSC07255a_HG_cs.jpg Measles

Measles leaf symptoms.

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Fig4HGMelanoseOnSweetOrangeFruit.jpg Melanose

Melanose on a sweet orange fruit.

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Fig3HGMelanoseOnSweetOrangeFruit.jpg Melanose

Melanose on a sweet orange fruit.

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melanose_on_grpfrttearstrak.jpg Melanose

Melanose tear-streak pattern on fruit.

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Melanose_Fruit5_Cesar_Calderon_USDA_APHIS_PPQ_Bugwood.org_cs.jpg Melanose

Melanose symptoms on fruit.

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Melanose_Fruit6_Cesar_Calderon_USDA_APHIS_PPQ_Bugwood.org_cs.jpg Melanose

Close-up of melanose symptoms on fruit.

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Melanose_Fruit1_Cesar_Calderon_USDA_APHIS_PPQ_Bugwood.org_cs.jpg Melanose

Close-up of melanose symptoms on fruit.

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Melanose_Fruit2_Cesar_Calderon_USDA_APHIS_PPQ_Bugwood.org_cs.jpg Melanose

Close-up of melanose symptoms on fruit.

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Melanose_Fruit3_Cesar_Calderon_USDA_APHIS_PPQ_Bugwood.org_cs.jpg Melanose

Close-up of melanose symptoms on fruit.

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Melanose_Fruit4_Cesar_Calderon_USDA_APHIS_PPQ_Bugwood.org_cs.jpg Melanose

Close-up of melanose symptoms on fruit.

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melanoseleaf.jpg Melanose

Melanose leaf symptoms.

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MVC_010F_Melanose_on_grapefruit_leaf_early_stage_of_disease_Dan_Robl_cs.jpg Melanose

Melanose on grapefruit leaf, early stage.

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MVC_395F_Melanose_on_grapefruit_leaf_mature_lesions_Dan_Robl_cs.jpg Melanose

Melanose on grapefruit leaf. Mature lesions/pustules are reddish-brown and raised.

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Melanose_star_melanose_on_grapefruit_leaf_Dan_Robl_cs.jpg Melanose

Star melanose on grapefruit leaf.

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MVC_194F_Melanose_on_grapefruit_leaf_star_melanose_Dan_Robl_cs.jpg Melanose

Star melanose on grapefruit leaf.

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MVC_198F_Melanose_on_grapefruit_leaf_star_melanose_Dan_Robl_cs.jpg Melanose

Star melanose on grapefruit leaf.

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MVC_199F_Melanose_on_grapefruit_leaf_star_melanose_Dan_Robl_cs.jpg Melanose

Star melanose on grapefruit leaf.

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Zinc_a.jpg Nutrient deficiency

Leaf chlorosis caused by zinc deficiency (most often on young foliage).

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Magnesium_902.jpg Nutrient deficiency

Leaf chlorosis caused by magnesium deficiency.

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Boron_defic_susp.jpg Nutrient deficiency

Raised veins and discoloration on leaf caused by boron deficiency.

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Nitrogen_l.jpg Nutrient deficiency

Whole-leaf chlorosis caused by nitrogen deficiency.

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01Phytophthora.jpg Phytophthora

Clementine mandarin tree killed by Phytophthora citrophthora.

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02Phytophthora.jpg Phytophthora

Gummosis on the branch of a Clementine tangerine.

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03Phytophthora.jpg Phytophthora

Gummosis and branch canker on Clementine mandarin tree.

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04Phytophthora.jpg Phytophthora

Tree symptom - trees of Clementine tangerine killed by Phytophthora trunk and branch cankers.

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05Phytophthora.jpg Phytophthora

Foot rot gummosis on tree.

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06Phytophthora.jpg Phytophthora

Extensive Phytophthora foot rot lesion showing bark death and tissue callusing on a tree.

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08Phytophthora.jpg Phytophthora

Phytophthora foot rot of sweet orange tree showing bark necrosis, light gumming, and callusing.

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09Phytophthora.jpg Phytophthora

Sweet orange tree more than half girdled by a Phytophthora lesion at the base of the tree.

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10Phytophthora.jpg Phytophthora

Trunk and branch canker on lemon showing gummosis and bark death on a tree.

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11Phytophthora.jpg Phytophthora

Yellow vein symptoms associated with girdling of a young tree by Phytophthora foot rot.

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07Phytophthora.jpg Phytophthora

Orange fruit with brown rot lesion.

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03Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

Leaf symptoms - discrete spots with yellow halo on older leaves of Washington Navel.

Leaf symptoms - discrete spots with yellow halo on older leaves of Washington Navel.

Leaf symptoms - discrete spots with yellow halo o »
08Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

Sporulation lesions of P. angolensis on lower surface of a leaf.

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01Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

Leaf spots caused by P. angolensis on Marsh Seedless grapefruit.

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06Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

Lesions on orange fruit.

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07Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

Spots on fruit.

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02Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

Raised tumor-like growths on young orange fruit.

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04Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

P. angolensis on fruit (oranges).

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05Pseudocercospora.jpg Pseudocercospora fruit and leaf spot

Sunken, necrotic lesions of P. angolensis on fruit (oranges).

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4_CRSVfruitpsorisis.jpg Psorosis

Ring-shaped chlorotic patterns on psorosis-infected fruit.

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leafpsorosis.jpg Psorosis

Psorosis lesions on leaf.

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Psorosis_Leaf_Jeffrey_W._Lotz_Florida_Dep_of_Ag_and_Consumer_Services_Bugwood.org_cs.jpg Psorosis

Psorosis symptoms on leaf.

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Psorosis_Leaf_Stephen_M._Garnsey_USDA_ARS_South_Atlantlic_Area_Bugwood.org_cs.jpg Psorosis

Leaf symptoms - naturally spread psorosis on foliage (Citrus ringspot).

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Psorosis_Leaves_Stephen_M._Garnsey_USDA_ARS_South_Atlantlic_Area_Bugwood.org_cs.jpg Psorosis

Mature leaf symptoms of a Florida isolate of citrus ringspot.

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Psorosis_Trunk_and_Leaf_Stephen_M._Garnsey_USDA_ARS_South_Atlantlic_Area_Bugwood.org_cs.jpg Psorosis

Composite slide showing bark and leaf symptoms of naturally spread psorosis in Argentina.

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Psorosis_Argbark.jpg Psorosis

Scaling and flaking of bark on trunk

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Psorosis_Trunk_Stephen_M._Garnsey_USDA_ARS_South_Atlantlic_Area_Bugwood.org_cs.jpg Psorosis

Severe bark scaling typically associated with citrus ringspot and some forms of psorosis. Citrus sinensis tree infected with "naturally spread" psorosis.

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Psorosis_Trunk2_Stephen_M._Garnsey_USDA_ARS_South_Atlantlic_Area_Bugwood.org_cs.jpg Psorosis

Bark scaling typically associated with citrus ringspot and some forms of psorosis. Citrus sinensis tree in Argentina infected with "naturally spread" psorosis.

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Psorosis_Staining_of_interior_wood2_CNR_cs.jpg Psorosis

Staining of interior wood of a branch of sweet orange infected with psorosis-A. This symptoms is diagnostic for psorosis-A when found on trees showing bark lesions. Courtesy EcoPort (ht »

Psorosis_Staining_of_interior_wood1_CNR_cs.jpg Psorosis

A specimen of wood staining (branch) symptomatic of psorosis-A observed at Bella Vista, Argentina. Courtesy EcoPort (http://www.ecoport.org), Roistacher CN

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Septoria_JimAdaskaveg_Category_1_cs.jpg Septoria

Ice-mark and early symptoms of septoria spot on fruit. Photos by Jim Adaskaveg, UCR.

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Septoria_JimAdaskaveg_Category_1_and_2_cs.jpg Septoria

Ice-mark and early and advanced symptoms of septoria spot on fruit. Photos by Jim Adaskaveg, UCR.

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Septoria_JimAdaskaveg_Category_2_cs.jpg Septoria

Advanced symptoms of septoria spot on fruit. Photos by Jim Adaskaveg, UCR.

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Septoria_spot_on_lemon_fruit_Robert_G_Platt_UC_Statewide_IPM_Project_cs.jpg Septoria

Septoria symptoms on fruit.

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sweetorangescabonvalencia2.jpg Sweet orange scab

Sweet orange scab on Valencia fruit.

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sweetorangescabonvalencia.jpg Sweet orange scab

Sweet orange scab on Valencia fruit.

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Elsinoe_australis_Fortunella_sp_Positive_cs.jpg Sweet orange scab

Lesions on fruit of Fortunella sp.

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Elsinoe_australis_Citrus_limon_Fruit_Positive_cs.jpg Sweet orange scab

Lesions on fruit of Citrus limon.

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Elsinoe_australis_Citrus_paradisi_Positive_2_cs.jpg Sweet orange scab

Lesions on fruit of Citrus paradisi.

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Elsinoe_australis_Citrus_paradisi_Positive_cs.jpg Sweet orange scab

Lesions on fruit of Citrus paradisi.

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Elsinoe_australis_Citrus_paradisi_Positive_and_Negative_lesions_cs.jpg Sweet orange scab

Lesions on fruit of Citrus paradisi, positive and negative.

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Elsinoe_australis_Citrus_paradisi_Positive_on_Leaves_cs.jpg Sweet orange scab

Lesions on Citrus paradisi leaf, top side of leaves on left, bottom side of leaves on right.

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Elsinoe_australis_Citrus_paradisi_Positive_Sample_in_PCR_2_cs.jpg Sweet orange scab

Lesions on fruit of Citrus paradisi.

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Elsinoe_australis_Citrus_paradisi_Positive_Sample_in_PCR_3_cs.jpg Sweet orange scab

Lesions on fruit of Citrus paradisi.

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Elsinoe_australis_Citrus_paradisi_Positive_Sample_in_PCR_cs.jpg Sweet orange scab

Lesions on fruit of Citrus paradisi.

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Elsinoe_australis_Citrus_reticulata_Positive_2_cs.jpg Sweet orange scab

Lesions on fruit of Citrus reticulata.

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Elsinoe_australis_Citrus_reticulata_Positive_cs.jpg Sweet orange scab

Lesions on fruit of Citrus reticulata.

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Elsinoe_australis_Citrus_sinensis_Fruit_Positive_cs.jpg Sweet orange scab

Close-up of lesion on fruit of Citrus sinensis.

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Elsinoe_australis_Citrus_sinensis_Leaves_Positive_A_cs.jpg Sweet orange scab

Lesions on leaf of Citrus sinensis.

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Elsinoe_australis_Citrus_sinensis_Leaves_Positive_B_cs.jpg Sweet orange scab

Lesions on leaf of Citrus sinensis.

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Elsinoe_australis_Citrus_sp_Positive_2_cs.jpg Sweet orange scab

Lesions on fruit.

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Elsinoe_australis_Citrus_sp_Positive_3_cs.jpg Sweet orange scab

Close-up of lesions on leaf.

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Elsinoe_australis_Citrus_sp_Positive_4_cs.jpg Sweet orange scab

Close-up of lesions on leaf.

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Elsinoe_australis_Citrus_sp_Positive_5_cs.jpg Sweet orange scab

Lesions on leaf.

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Elsinoe_australis_Citrus_sp_Positive_cs.jpg Sweet orange scab

Lesions on fruit.

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Elsinoe_australis_Citrus_sp_Tangelo_Positive_2_cs.jpg Sweet orange scab

Close-up of lesions on tangelo.

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Elsinoe_australis_Citrus_sp_Tangelo_Positive_cs.jpg Sweet orange scab

Lesions on tangelo.

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Elsinoe_australis_Fortunella_sp_Leaves_Positive_cs.jpg Sweet orange scab

Leaf lesions on Fortunella leaves.

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20_honeycombfromctv.jpg Tristeza

Honeycomb pattern of stem pitting symptomatic of tristeza

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10_StemPittingtrestesia_Grapefruit.jpg Tristeza

Stem-pitting on grapefruit symptomatic of tristeza

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12_CTV_stempittingrangpurlimerootBrazil.jpg Tristeza

Stem pitting symptomatic of tristeza on Rangpur lime root

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Tristeza_lime09_MLP_cs.jpg Tristeza

Branch symptoms - lime branches showing pitting.

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Tristeza_Seedling_Yellow4_crop_MLP_cs.jpg Tristeza

Leaf symptoms - Seedling Yellows.

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Tristeza_Seedling_Yellow_crop_MLP_cs.jpg Tristeza

Leaf symptoms - Seedling Yellows.

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8_Tristeza_Leaf_Flecking.jpg Tristeza
Chlorotic leaf flecking symptoms of tristeza. »
9vienclearing_Tristeza_Key_Lime.jpg Tristeza

Leaf symptoms - Vein-clearing in key lime leaves.

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1337_Ecoport_Tristeza_mild_reaction_vein_clearing_Roistacher_CN_cs.jpg Tristeza

A mild reaction of vein clearing on a leaf. Courtesy EcoPort (http://www.ecoport.org), Roistacher, C.N.

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1336_Ecoport_Tristeza_Leaves_Roistacher_CN_cs.jpg Tristeza

Vein-clearing symptoms a Mexican lime seedling leaf (right) as viewed from the back of the leaf into direct sunlight. The control leaf is on the left. Courtesy EcoPort ( http://www.ecoport.org)

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Tristeza_trees_in_decline_MLP_cs.jpg Tristeza

Tree symptom - quick decline.

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Tristeza_QD_severe_MLP_cs.jpg Tristeza

Tree symptom - severe quick decline.

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Tristeza_Lindsay_Quick_Decline_2_Aug_09_MLP_Rick_Dunn_cs.jpg Tristeza

Tree symptom - Trees in decline along side healthy trees.

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Tristeza_Lindsay_QD_3_Aug_09_MLP_Rick_Dunn_cs.jpg Tristeza

Tree symptom - quick decline.

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Tristeza_QD_on_Spruce_BGC_08_09_MLP_Elizabeth_GC_cs.jpg Tristeza

Tree symptom - quick decline.

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Tristeza_Photo_3_trunk_SP_MLP_cs.jpg Tristeza

Stem Pitting on trunk.

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Tristeza_Quick_Decline_at_graft_union_MLP_cs.jpg Tristeza

Tree symptom - quick decline at graft union.

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Tristeza_Fruit_QD_MLP_cs.jpg Tristeza

Quick Decline on fruit.

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1319_Ecoport_Tristeza_Fruit_Lee_RF_cs.jpg Tristeza

Fruit from a Marsh grapefruit tree on rough lemon rootstock in Colombia affected by stem pitting strains of tristeza. The large fruit on the right is not affected. Courtesy EcoPort ( http://www.ecoport.org)

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Citrus Diseases
March, 2013