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Hawaii Pest and Disease Image Gallery 

Miscellaneous Plants and Crops

Crops are listed in alphabetical order by common or scientific name and pests and plant health problems are listed below each crop, with different symptoms or other important aspects listed adjacent to each pest entry. Browse and click on an image associated with a particular problem. View, save or print the image. Click on your browser’s “back arrow” to return to this page. 

For free articles about these and other diseases visit: http://www.hawaiiplantdisease.net/Publications.php

For more high-resolution photographs visit Dr. Nelson's FLICKR gallery: http://www.flickr.com/photos/scotnelson/

Questions or comments: contact snelson@hawaii.edu


Abutilon (Abutilon menziesii)

  • Rust (fungus, Puccinia heterospora): | rusted leaves 1 2 3 4 | text [PDF] |

Abutilon molle (hairy Abutilon)

  • Rust (fungus, Puccinia heterospora): | rusted foliage 1 2 3 | orange flower 1 |

Abutilon striatum (flowering maple, parlor maple, Indian mallow, ‘Gold Dust’)

  • Abutilon Mosaic Virus (AbMV): | foliar mosaic 1 2 3 4 5 6 | text [PDF] |

Aglaonema (Aglaonema comutatum)

  • Bacterial leaf blight (bacterium, Erwinia carotovora): | leaf spots, hydrosis and blight 1 |

Avocado (Persea americana)

  • Algal leaf spot (algae, Cephaleuros virescens): | leaf spots 1 2 3 4 | text [PDF] |
  • Anthracnos
  • e (fungus, Colletotrichum gloeosporiodes): | fruit lesions and with blight with sporulation | 1 2 3 | scattered, sunken spots on fruit 1 | fruit symptoms at road market 1 2 3 | text [PDF] |
  • Lichen (non-parasitic) | lichens on leaf 1 |
  • Mites (arthropod, Persea mite, Oligonychus perseae): | damage to avocado leaves 1 2 3 4 |
Bamboo (Bambusa spp.)

Banana (Musa spp.)

Basil (Ocimum basilicum)

Beach morning glory (Ipomoea pes-caprae subsp. brasiliensis, Pohueuhue)

  • Cercospora leaf spot (fungus, Cercospora sp.): | leaf spots 1 2 3 | text [PDF] |

Beans (Phaseolus vulgaris)

  • Chinese rose beetle (insect, Adoretus sinicus): | “windowing” of foliage 1 2 |
  • Root knot (nematode, Meloidogyne spp.): | string bean galled and knotted roots 1 |
  • Spider mites (insect, Carmine spider mite, Tetranychus cinnarbarinus): | colony on bean leaf 1 |
Beet (Beta vulgaris)
  • Cercospora leaf spot (fungus, Cercospora beticola) | leaf spots and blight at community garden | 1 2 3 4 5 |

Bell Pepper (Capsicum annuum)

  • Anthracnose (fungus, Colletotrichum capsici): | fruit spot and rot 1 |
  • Bacterial wilt (bacterium, Ralstonia solanacearum): | wilting plant 1 2 | root rot 1 | vascular necrosis 1 | bacterial streaming from severed stem 1 |
  • Powdery mildew (fungus, Leveillula taurica) | powdery mildew on leaves 1 2 |
Black pepper (Piper nigrum)
  • Algal leaf spot (algae, Cephaleuros sp.) | leaf spots in Pohnpei (FSM) 1 2 3 |
Blueberry (Vaccinium spp.)
Breadfruit (Artocarpus altilis)
  • Phytophthora fruit blight (Straminipiles, Phytophthora parasitica) | fruit blight 1 2 3 4 |
Cabbage (Brassica oleracea)
  • Slugs feeding injury | leaf symptoms in N. Kona garden 1

Cacao  (Theobroma cacao)

  • Black pod (Straminipiles, Phytophthora parasitica) | symptoms 1 2 3 | pathogen 1 2 3 4 |
  • Chinese rose beetle (insect, Adoretus sinicus): | “windowing” of foliage 1 |

Canna lily (Canna indica)

  • Rust (fungus, Puccinia thaliae = Puccinia cannae): | rusted foliage 1 2 3 4 5 | text [PDF] |

Carrot (Dauca carota)

  • Root knot (nematodes, Meloidogyne spp.): | galling and deformation of carrot roots 1 |

Celery (Apium graveolens)

  • Cercospora leaf spot (fungus, Cercospora apii): | leaf spots and blight 1 2 |

Chinese long beans (Vigna unguiculata subsp. sequipedalis)

  • Powdery mildew (fungus, Sphaerotheca fuliginea): | mildewed leaves 1 2 |

Chinese pine (Pinus tabuliformis, containerized)

  • Rhizoctonia root rot (fungus, Rhizoctonia solani): | foliar necrosis and dieback 1 2 | root rot 1 2 |

Citrus (Citrus spp.)

  • Blackfly (insect, Aleurocanthus woglumi): | colony on foliage 1 |
  • Citrus canker (bacterium, Xanthomonas axonopodis pv. citri) | fruit and leaf symptoms in the Federated States of Micronesia (Pohnpei, Kosrae) 1 2 3 4 5 6 7 8 9 |
  • Catface (probably physiological, unknown cause): | catface on lemon fruit 1 | citrus catface 1 2 |
  • Fungal (Elsinoe) scab (fungus, Elsinoe fawcetti): | scabby fruits 1 2 3 | elsinoe scab symptoms on tangerine fruit, leaves/foliage 1 2 | text [PDF] |
  • Zinc deficiency (abiotic): | interveinal chlorosis of leaves 1 2 | chlorosis of entire tree 1 |
  • Leaf miner (insect, Phyllocnistis citrella): | miner tunnels on citrus leaves 1 |
  • Melanose (fungus, Diaporthe citri/Phomopsis citri): | fruit spotting on grapefruit 1 | tear stains on navel orange 1 | appressed & scabby spots on orange 1 | text [PDF] |
  • Mite feeding injury (insect, spider mites): | stippling or bronzing of fruit surface 1 2 | 
  • Penecillium rot or mold (fungus, Penecillium sp.): | rotting fruit 1 |
  • Souring beetles (insect): | colony of souring beetles infesting citrus fruit 1 |
  • Stem canker (Straminipiles, Phytophthora parasitica) | symptoms (cracking, peeling stem bark)  1 2 3 |
  • Tristeza (virus, Citrus tristeza virus, CTV) | virus particles 1 | stem pitting 1 | tree decline in Florida 1 2 | text [PDF] |

Coffee (Coffea arabica)

Corn (Zea mays)

  • Corn leaf aphid (insect, Rhopalosiphum maidis): | colony on corn foliage with alates, apterous and cast skins 1 2 3 | damage to corn crop 1 |
  • Damping off (Stramemipiles, Pythium sp.) | seedlings at Waimanalo |
  • Gibberella ear rot (fungus, Gibberella zea) | ear rot at Mealani HI | 1 2 3 4 5 6 7 8 9 10 11 |
  • Smut (fungus, Ustilago maydis): | smutted ear 1 2 |
  • Maize chlorotic mottle (Maize chlorotic mottle virus, MCMV) | 1 2 3 | text [PDF] |
  • Maize mosaic (virus, Maize mosaic virus): | foliar mosaic 1 |
  • Mouse feeding injury | corn ears |
  • Pythium stalk rot (pseudofungus, Pythium aphanidermatum): | stalk rot 1 |
  • Southern rust (fungus, Puccinia polysora) | rusted leaf |

Crotolaria (Crotolaria sp.)

  • Powdery mildew (fungus): | mildewed foliage and seed pods 1 2 3 |
Crucifers
  • White rust (Albugo candida, Stramenopila): | text [PDF] |
Cucumber (Cucumis melo)
  • Pickleworm (insect, Diaphania nitidalis) | holes in fruit |
  • Powdery mildew [fungus, Podosphaera xanthii (Sphaerotheca fulignea)]: | mildewed leaf |
  • Root knot (nematodes, Meloidogyne spp.): | text [PDF] |
Cymbidium (orchids)
  • Cymbidium mosaic (virus, Cymbidium mosaic virus) | foliar mosaic 1 |

Cypress (Cypress family)

  • Cypress roach (insect, Diploptera dytiscoides): | damage to cypress foliage 1 2 | adult roach 1 |
Dendrobium
  • Dendrobium mosaic (virus, Dendrobium mosaic virus): | flower mosaic 1 2 |
Dodonea, Aalii (Dodonea viscosa)
  • Yellows (phytoplasma, Aster yellows phytoplasma) | healthy plant 1 | yellows and dieback 1 2 |
Dragonfruit, Pitaya (Hyloceras spp.)
  • Botrytis blight (fungus, Botrytis prob. cinerea) | tip blight 1 2 3 4 5 | pathogen sporulation 1 2 3 4 |

Eggplant (Solanum melongena)

  • Bacterial wilt (bacterium, Ralstonia solanacearum): | wilting plant(s) 1 |
  • Cercospora leaf spot (fungus, Cercospora melongenae) | leaf spots and blight 1 2 3 | text [PDF] |
  • Phomopsis blight (fungus, Phomopsis vexans) | blight of fruit and leaf 1 2 |
  • Root knot (nematode, Meloidogyne spp.) | galls on roots 1 |

Ficus (Ficus spp)

  • Cuban Laurel thrips (insect, Gynaikothrips ficorum): | leaf rolling, curling, necrosis and stippling 1 2 |
  • Gall wasp (insect, Camarothorax sp.): | galling and distortion of Ficus benjamina leaves 1 2 3 |
  • Stem gall wasp (insect, un-described): | stem galling on Banyan tree |

Fig (edible, Ficus carica)

  • Fig mild mottle associated virus: | leaf mottling and mosaic 1 2 3 |
  • Rust (fungus, Cerotelium fici): | leaf rust, Manoa valley, Oahu 1 2 |

Fishtail palm (Caryota mitis)

  • Bacterial leaf blight (bacterium, Acidovorax avenae subsp. avenae): | photograph set (9 images) | text [PDF] |
  • Copper fungicide spray injury: | leaf spots |
  • Potassium deficiency: | leaf spots and marginal necrosis of leaves 1 |

Gardenia (Gardenia jasminoides)

  • Powdery mildew (fungus, Erysiphe polygoni): | mildewed gardenia foliage 1 |
  • Root knot (nematodes, Meloidogyne spp.): | severely galled gardenia roots 1 |
Geranium (Geranium sp.)
  • Rust (fungus, Puccinia pelargonii-zonalis) | spots on upper leaf surface 1 | rust on lower leaf surface 2 3 |

Ginger (Zingiber officinale)

  • Bacterial wilt (bacterium, Ralstonia solanacearum): | yellow, wilting plant 1 2 | bacterial streaming from severed ginger rhizome 1 | wilting field of plants 1 2 | rotting rhizome 1 | water-soaked, translucent rhizome 1 | internal diseased rhizome tissue 1 | bacterial wilt of ginger website: http://www.ctahr.hawaii.edu/gingerwilt/
  • Banana bract mosaic (red ginger) (virus, Banana bract mosaic virus) | foliar mosaic |

Glycine (Glycine wightii)

  • Cucumber mosaic (virus, Cucumber mosaic virus): | foliar mosaic 1 |

Grapefruit (Citrus x paradisi)

  • Melanose (fungus, Diaporthe citri): | foliar lesions and chlorosis 1 2 | fruit lesions and spots 1 2 | text [PDF] |

Guava (Psidium spp.)

  • Algal leaf spot (algae, Cephaleuros parasiticus): | leaf spots on adaxial and abaxial leaf surfaces 1 2 3 4 5 | text [PDF] |
  • Potassium deficiency (physiological): | leaf flecking and spotting, marginal necrosis 1 2 |
Glycine (Glycine javanica)
  • Cucumber mosaic (virus, Cucumber mosaic cucumovirus, CMV): | leaf mosaic 1 |
Hala (Pandanus tectorius)
  • Cassytha filiformis (plant-parasitic seed plant) | on island of Yap 1 2 | text [PDF] |

Halapepe (Pleomele hawaiiensis)

  • Potassium deficiency (fertilizer element): | Chlorotic flecks and spots on older leaves 1 2 3 4 |

Hawaiian mint (Haplostachys haplostachya)

  • Powdery mildew (fungus, unidentified): | mildewed foliage 1 2 |

Heliotrope (tree heliotrope, Tournefortia argentea)

  • Rust (fungus, Uredo wakensis): | rusted leaves 1 2 3 | text [PDF] |

Hibiscus (Hibiscus sp.)

  • Gall mites (insect, Hibiscus erineum mite, Aceria hibisci): | galled and distorted foliage 1 2 3 |
  • Green spot (virus, Hibiscus green spot virus): | photo gallery showing foliar symptoms |
  • Phosphorous deficiency (physiological): | anthocyanescent foliage on declining plant 1 |
  • Cassytha filiformis (plant-parasitic seed plant) | on island of Yap 1 2 |
  • Pot-bound plant dies in landscape after transplanting (physiological): | wilting plant and pot-bound, self-choking roots 1 2 |

Hibiscus furcellatus (endemic to Hawaii)

  • Powdery mildew (fungus, undetermined species): | mildewed leaves 1 |
  • Chinese rose beetle (insect, Adoretus sinicus): | “windowing” of H. furcelatus foliage 1 |
  • Hibiscus (pink colored) (Hibiscus sp.)
  • Gall mites (insect, Hibiscus erineum mite, Aceria hibisci): | pink flower 1 | foliar damage by gall mites to hibiscus 1 2 3 4 |
  • Bacterial leaf spot (bacterium, Pseudomonas sp.): | leaf spots with chlorotic halos 1 2 3 4 |

Honeydew melon (muskmelon, Cucumis melo)

  • Ulocladium post-harvest rot (fungus, Ulocladium cucurbitae): | stem end rot 1 2 | black lesions on fruit after harvest 1 |

Honohono grass (Commelina diffusa)

  • Cucumber mosaic (virus, Cucumber mosaic virus): | foliar mosaic 1 |
Hoya (Hoya calycina)

Ilima (Sida fallax)

  • Dodder (parasitic seed plant, Cuscuta sp.): | 1 2 3 4 5 6 7 |
  • Phosphorus deficiency: | purplish, anthocyanescent leaves and sparse growth 1 |
  • Rust (fungus, Puccinia heterospora): | lesions on leaves 1 2 3 4 | text [PDF] |
Impatiens (Impatiens spp.)
  • Downy mildew (Stramenoplies, Peronospora obducens): | chlorotic leaves | downy mildew on lower leaf surface 1 2 |

Iris (Iris sp.)

  • Scale (insect, unidentified species): | foliar damage and scale colonies on leaves 1 2 3 |
Jaboticaba (Myrciaria cauliflora Syn. Eugenia cauliflora)
  • Rust (fungus, Puccinia psidii) | rusted fruit 1 2 |

Jackfruit (Artocarpus heterophyllus)

  • Rhizopus rot (fungus, Rhizopus spp.): | rotting fruits covered with mycelium 1 2 | text [PDF] |
Japanese pittosporum (Pittosporum tobira)
  • Psyllid injury (insect, unidentified species): | photograph set (14 images) |

Japanese privet (Ligustrum japonicum)

Jatropha (Jatropha curcas)

  • Papaya mealybug (insect, Paracoccus marginatus): | mealybug colonies on Jatropha foliage 1 2 3 |
  • Broad mite injury (insect, Polyphagotarsonemus latus): | foliar deformity, leatheryness and rugosity 1 2 |

Kalanchoe (Kalanchoe thyrsiflora)

  • Anthracnose (fungus, Colletotrichum gloeosporiodes): | anthracnose lesions and blight of Kalanchoe foliage 1 2 |

Kava, `Awa (Piper methysticum)

Koa (Acacia koa)

Lama (Diospyros ferrea)

  • Witches' broom (parasite: eriophyid mites) | branch galling and witches' brooms 1 2 |

Lemon grass (Cymbopogon spp.)

  • Rust (fungus, Puccinia nakanishikii): | foliar lesions, necrosis, and rust pustules 1 | heavily rusted plant 1 | text [PDF] |

Lettuce (Lactuca sativa)

  • Cercospora leaf spot (fungus, Cercospora longissima): | leaf spots and blight 1 |
  • Bacterial blight (bacterium, Pseudomonas marginalis pv. marginalis): | blackened, necrotic vascular and leaf tissue 1 2 |

Lychee (Litchi sinensis)

  • Erinose mites (insect, Aceria litchii): | foliar distortion and “brown fuzz” 1 2 3 4 |

Macadamia (Macadamia sp.)

  • Botrytis flower blight (fungus, Botrytis prob. cinerea) | blighted racemes with sporulation 1 |
  • Broad mite injury (insect, Polyphagotarsonemus latus): | foliar deformity, leatheryness and rugosity 1 | Link to Crop Knowledge Master |
  • Glyphosate injury (herbicide): | apical chlorosis, rosetting, stunting & witches’ broom symptom on macadamia foliage 1 |
  • Magnesium deficiency: | interveinal chlorosis of older macadamia leaves 1 |
  • Thrips injury (insect, probably redbanded thrips (Selenothrips rubrocinctus): | stippling injury to macadamia leaves 1 |
  • Quick decline (undetermined etiology): | declining and dying trees 1 2 3 |

Magnolia (Magnolia sp.)

  • Algal leaf spot (algae, Cephaleuros virescens): | leaf spots 1 |

Malay apple (mountain apple, Syzygium malaccense)

  • Psyllid (insect, Megatrioza vitiensis): | galls on leaves of Malay apple 1 2 (photos are from island of Kosrae, pest not known in Hawaii) | link to PestNet |

Mamaki (Pipturis albidus)

  • Mealybugs and ants (insects): | colonies of mealybugs and long-legged ants on mamaki stem 1 |

Manele, Hawaiian soapberry (Sapindus saponaria)

  • Cotton lace bug (insect, Corythucha gossypii): | foliar damage and lace bugs on leaves 1 2 |

Mango (Mangifera indica)

Mock orange (Philadelphus sp.)

  • Glyphosate injury (herbicide): | deformed foliage, witches’ brooms 1 |
  • Phytophthora blight (Stramenipiles, unidentified species of Phtyophthora | blight of hedge in Hilo 1 2 3 4 5 6 7 8 |
  • Powdery mildew (fungus): | mildewed foliage 1 |
Monkeypod (Albizia saman)

Naupaka, beach (Scaveola sericea)

  • Dieback (fungus, Verticllium dahliae): | wilting plant 1 2 3 | yellowing plant 1 | vascular necrosis 1 2 3 |
  • Cassytha filiformis (plant-parasitic seed plant) | on napuaka foliage, island of Yap 1 |

Noni (Morinda citrifolia)

Odontoglossum (orchids)

  • Odontoglossum ringpot (virus, Odontoglossum ringspot virus) | photos |

Ohia (Metrosideros polymorpha)

  • Cassytha filiformis (parasitic seed plant): | infestation of mature trees 1 2 | haustoria 1 | flowers 1 |
  • Psyllid injury (insect, Trioza spp.): | Raised, anthocyanescent gall-spots on leaves 1 2 |
  • Rust (fungus, Puccinia psidii): | rusted, necrotic, spore-bearing foliage 1 2 3 4 5 6 7 8 |

Oleander (Nerium oleander)

  • Aphids (insects, oleander aphid, Aphis nerii): | oleander aphids on stem 1 |

Orchids

  • Bacterial leaf blight of Phalaenopsis (bacterium, Burkholderia gladioli): | leaf blight and hydrosis 1 2 |
  • Odontoglossum ringspot (virus, Odontoglossum ringspot virus): | flower spots 1 2 | leaf spots 1 2 |
  • Sunburn of Phalaenopsis: | necrotic, sunburned foliage 1 2 3 |

Oxalis (Oxalis spp.)

  • Rust (fungus, Puccinia oxalidis): | rusted leaves 1 |

Palms

Panax (Polyscias guilfoylei)

Papaya (Carica papaya)

Passion fruit (Passiflora sp.)

  • Anthracnose (fungus, Colletotrichum sp., probably C. gloeosporiodes): | fruits spots and lesions 1 2 |
Periwinkle (Littorina littorea)
  • Yellows (phytoplasma, Ater yellows phytopplasma) | yellowing, floral reversion 1 2 3 |

Pineapple (Ananas comosus)

  • Heart rot (pseudofungus, Phytophthora parasitica): | decay of heart leaves 1 2 |
  • Fruit blight (pseudofungus, Phytophthora cinnamomi): | blighted fruit (low-acid hybrid variety with reduced resistance to infection) 1 |
  • Mealybug wilt (virus, Pineapple mealybug wilt associated virus): | wilt 1 |
  • Root rot (pseudofungus, Phytophthora cinnamomi): | wilting plants 1 | rotten root system 1 |

Pipinola/Chaote (Sechium edule)

  • Anthracnose (fungus, Colletotrichum gloeosporiodes): | fruit lesion and decay 1 |
Pitcher plant (Nepenthes mirabilis)
  • Cassytha filiformis (plant-parasitic seed plant) | on island of Yap 1 |

Plumeria/Frangipani (Plumeria spp.)

  • Rust (fungus, Coleosporium domingense syn C. plumeriae): | rust pustules on abaxial leaf surface 1 2 3 4 | rust and mildew together 1 | pustules and leaf necrosis 1 | adaxial leaf surface – spots and necrosis 1 |
  • Powdery mildew (fungus): | mildew on leaves 1 | leaf rugosity and deformity associated with mildew 1 2 | rust, mildew, deformity 1 |
  • Spiralling whitefly (insect, Aleurodicus dispersus): | colony on Plumeria leaf 1 |

Podocarpus (Podocarpus sp.)

  • Black twig borer (insect, beetle, Xylosandrus compactus): | wilting foliage 1 2 | holes in stems 1 2 3 |

Poinsettia (Euphorbia pulcherrima)

  • Powdery mildew (fungus, Erysiphe euphorbiicola): | mildewed poinsettia foliage 1 2 3 | text [PDF] |
  • Whitefly (insect): | colony on poinsettia foliage 1 |

Potato (Solanum tuberosum)

  • Late blight (pseudofungus, Phytophthora infestans): | leaf blight with Phytophthora sporangia 1 |
  • Sore shin (fungus, Rhizoctonia solani): | lesions on stem 1 2 | sclerotia on tuber 1 |
  • Soft rot (bacterium, Erwinia carotovoa): | soft rot lesions on potatoes 1 | internal necrosis of potato 1 |
Pua Kene Kene (Fagraea berteriana (sometimes as F. berteroana))
  • Root knot (nematodes, Meloidogyne sp.) | foliar chlorosis 1 2 | galls on roots 1 2 3 4 |
Rambutan (Nephelium lappaceum)

Red sandalwood, false wili-wili (Adenanthera pavonina)

  • Erythrina gall wasp (insect, Quadrastichus erythrinae): | galled and distorted foliage 1 | gall wasp damage plus powdery mildew 1 |

Rose (Rosa multifloraRosa spp.)

  • Black spot (fungus, Diplocarpon rosae): | leaf spots on rose foliage 1 2 3 4 | text [PDF] |
  • Phomopsis canker (fungus, Diaporthe eres (imperfect stage Phomopsis mali): | cankers on rose stems 1 2 3 4 5 |
  • Powdery mildew (fungus, Sphaerotheca pannosa) | mildewed foliage 1 2 3 4 5 |
  • Rust (fungus, Phragmidium sp., at Cabella, Italy) | leaf upper surface, chlorotic lesions 1 | leaf lower surface, rust 1 |
  • Thrips injury (insect): | damage to and necrosis and puckering of the margins of rose petals 1 |

Rose apple/Malabar plum (Syzygium jambos)

  • Rust (fungus, Puccinia psidii): | rusted and necrotic leaves 1 2 3 4 |

Sapote, white (Casimiroa edulis)

  • Cotton lace bug (insect, Corythucha gossypii): | foliar damage and insects on leaves 1 2 3 4 |

Sago palm (Queen sago) (Cycas cirinalis)  

  • Cycad scale (insect, Aulacaspis yasumatsui): | colony on queen sago palm 1 | text
Senna (Kolomona; scrambled egg tree; Senna surattensis)
  • Rust in Hilo and Hana, Hawaii (fungus, unidentified genus and species) | 1 2 3 |

Shower tree (Cassia fistula)

  • Basal stem rot, girdling, plant dieback (physiological, planted too deep): | shower tree dieback in landscape due to stem girdling 1 |

Spider lily (Lycoris radiata)

  • Spider mite injury (insect, Carmine spider mite, Tetranychus cinnabarinus): | stippling and purpling of leaves 1 |

Squash (Cucurbita sp.)

  • Anthracnose (fungus, Colletotrichum gloeosporiodes): | spots of fruit 1 2 | lesions with abundant sporulation 1 |

Sugarcane (Saccharum officinarum)

  • Sugarcane lace bug (insect, Leptodictya tabida): | colony of lace bugs and their damage to sugarcane leaf 1 |
  • Sugarcane yellow leaf virus: | foliar symptoms 1 |

Sunflower (Helianthus annuus)

  • Chinese rose beetle (insect, Adoretus sinicus): | “windowing” of foliage 1 2 |
  • Leaf miner (insect, prob. Microrhopala vittata): | black areas on leaves 1 |
  • Powdery mildew (fungus, Pathogen: Erysiphe cichoracearum): | mildewed leaves 1 2 |  
  • Wilt (fungus, Sclerotinia sp.): | wilted plants 1 |      

Sweetpotato (Ipomoea batatas)

  • Black rot (fungus, Ceratocystis fimbriata): | lesions on purple-flesh sweet potatoes 1 2 3 | lesions with mycelium forming on potatoes in transit 1 | PowerPoint presentation [PDF] |
  • Java black rot (fungus, Diplodia gossypina): | text with photographs [PDF] |
  • Rat feeding injury: | gnawing injury to sweet potato 1 | 
  • Rhizopus soft rot (fungus, Rhizopus sp.): | photograph set (4 images) |
  • Scurf (fungus, Monilochaetes infuscans): | photograph set (2 images) |
  • Weevils (insect, Cylas formicarius): | adults 1 | grubs 1 2 | holes in sweet potato 1 | grub tunnels and interior damage to sweet potatoes 1 2 |

Swiss chard (Beta vulgaris var. cicla)

  • Cercospora leraf spot (fungus, Cercospora beticola): | leaf spots |

Syngonium sp.

  • Bacterial leaf blight (bacterium, Xanthomonas sp.): | marginal leaf blight and chlorosis 1 |

Taro (Colocasia esculenta)

  • Aphids (insect, probably the banana aphid, Pentalonia nigronervosa): |  aphid colony and ants on taro leaf 1 |
  • Leaf blight (pseudofungus, Phytophthora colocasia): | leaf spots and blight 1 2 3 4 5 | text [PDF] |
  • Dasheen mosaic (virus, Dasheen Mosaic Virus): | foliar symptoms (feathery mottle) 1 2 3 | vein necrosis 1 | leaf roll 1 | severe leaf deformity 1 | text [PDF] |
  • Delphacids (insect) | 1 2 |       
  • Root knot (nematode, Meloidogyne javanica): | compare fumigated versus non-fumigated taro plots 1 2 |
  • Spider mites (Carmine spider mite, Tetranychus cinnabarinus): | spider mites on taro leaves in greenhouse setting 1 2 |
  • Taro vein chlorosis (Virus, Taro vein chlorosis virus) | chlorotic veins |

Tea (Camellia sinensis)

  • Katydid feeding injury (insect, Conocephalus sp.): | adult katydid on leaf of Cammelia sinensis 1 2 | katydid feeding injury to tea leaves 1 |
  • Zinc deficiency: | article with photograph [PDF] |

Ti (Cordyline fruticosa, Cordyline sp.)

  • Cercospora leaf spot and blight (fungus, Cercospora sp.) | spots and blight 1
  • Hopper burn (insect, two-spotted leafhopper, Sophonia rufofascia): | angular foliar lesions and chlorosis 1 2 3 4 |
  • Caterpillar feeding injury (unidentified small caterpillar): | caterpillar feeding injury to foliage of Cordyline sp.1 2 |
  • Spiraling whitefly (insect, Aleurodicus dispersus): | spiraling whitelfy colonies on green ti leaves 1 2 3 |

Tomato (Solanum lycopersicum)

  • Bacterial canker (bacterium, Corynebacterium michiganense): | spot-like cankers on fruit 1 |
  • Bacterial spot (bacterium, Xanthomonas campestris pv. vesicatoria): | spots on tomato fruit 1 |
  • Calcium deficiency / blossom end rot: | fruit symptoms 1 |
  • Gray mold (fungus, Botrytis cinerea) | leaf blight 1 2 |
  • Late blight (Phytophthora infestans)
  • Potato Virus Y (virus, PVY) | lesions on leaf 1 |
  • Powdery mildew [fungus, Leveillula taurica (Oidiopsis taurica)]: | mildewed leaves 1 2 |
  • Root knot (nematode, Meloidogyne spp.): | severely galled roots of potted tomato plant 1 |
  • Russet mites (arthropod, tomato Russet mite, Aculops lycopersici) | necrotic foliage 1 2 |
  • Tobacco etch + PVY (viruses: Tobacco etch virus and Potato virus Y) | leaf necrosis and spotting |
  • Tobacco etch (virus: Tobacco etch virus): | leaf spots 1 2 |
  • Yellow leaf curl (virus, Tomato yellow leaf curl virus): | photo gallery showing foliar symptoms |

Turfgrass

  • Fairy ring (fungus, mushrooms): | mushroom fairy ring in lawn 1 2 | puffball-type fairy ring on golf course (turf: seashore paspalum, N. Kona) 1 2 | text [PDF] |
  • Frit fly (insect, Oscinella frit): | frit fly damage to golf course turfgrass 1 2 |

Turnip (Brassica rapa subsp. rapa)

  • Turnip mosaic (virus, Turnip mosaic virus) | foliar mosaic 1 2 3 4 5 6 7 8 |

Watercress (Nasturtium officinale)

  • Yellows (phytoplasma, Aster yellows phytoplasma 16Se1-group): | comparison of healthy and diseased plants 1 | yellowing and stunting of watercress 1 |

Westringia (Westringia sp.)

  • Root knot (nematodes, Meloidogyne spp.): | severely galled roots of stunted, dying plant from landscape 1 2 |

Wiliwili (Erythrina sandwicensis)

  • Erythrina gall wasp (insect, Quadrastichus erythrinae): | galled, distorted or necrotic foliage, defoliation 1 2 3 4 5 6 | severely affected trees 1 2 3 |

Yam (Dioscorea esculenta)

  • Anthracnose (fungus, Glomerella cingulata): | leaf spots 1 |

Zucchini (Cucurbita pepo)

  • Powdery mildew (fungus, Podosphaera xanthii (syn. Sphaerotheca fuliginea)): | mildewed leaves and petioles 1 2 |
  • Zucchini yellow mosaic (virus, Zucchini yellow mosaic virus): | foliar yellowing, distortion and mosaic 1 2 |

Links: The Farmer’s Bookshelf | Crop Knowledge Master | CTAHR homepage |

Photograph credits: Scot Nelson, Jan McEwen, Wayne Borth, Wayne Nishijima, J. B. Friday, James Brewbaker, Angela Kay Kepler, Frank Rust, Matthew Goo, Fred Brooks, Virginia Easton Smith, Alton Arakaki, John Hu, Michael Melzer, Jensen Uyeda

Site design: Scot Nelson (2007)

Updated: 30 October 2014

Notes: Photos are copyright-free for educational use. User may request high-resolutions versions of the photographs by contacting snelson@hawaii.edu.

 


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