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L

  • R. Kenneth Horst
Chapter

Keywords

Powdery Mildew Leaf Spot Rhizoctonia Solani Colletotrichum Gloeosporioides Cladosporium Herbarum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

LANTANA

  • Black Mildew. Meliola cookeana, FL.

  • Leaf Spot. Alternaria sp., TX.

  • Nematode, Leaf. Aphelenchoides fragariae, NJ.

  • Nematode, Root Knot. Meloidogyne spp., widespread.

  • Rot, Root. Phymatotrichum omnivorum, TX.

  • Rust. Puccinia lantanae (III), FL.

  • Virus. Tomato Spotted Wilt, PA.

  • Wilt. Fusarium sp., NJ.

LARCH (Larix)

  • Blight, Needle. Hypodermella laricis, Great Lakes, Pacific Northwest. Meria laricis, ID.

  • Blight, Seedling. Thelephora caryophyllea, ID, MT, girdle, smother; Rhizina undulata, ID; Meria laricis, WA.

  • Canker. Aleurodiscus amorphus, bark patch, Northwest; A. spinulosus; A. werii; Lachnellula willkommii, European larch canker, MA, eradicated, ME; Valsa kunzei var. kunzei.

  • Canker. Phomopsis pseudotsugae (Phacidiella coniferarum) on western larch, Northwest.

  • Damping-Off. Rhizoctonia solani, cosmopolitan.

  • Mistletoe, Dwarf. Arceuthobium campylopodum, MT to OR, WA; A. pusillum, Northeast, MN.

  • Needle Cast. Lophodermium sp., WA; L. laricinum, MT to OR; L. laricis, ID; Cladosporium sp., ME; Mycosphaerella laricina, IA, VT, WI.

  • Rot, Heart. Echinodontium tinctorium, WA; Fomes spp., widespread.

  • Rot, Root. Armillaria mellea, cosmopolitan; Phymatotrichum omnivorum, TX.

  • Rot, Sapwood. Lenzites saepiaria.

  • Rot, Seedling. Botrytis douglasii, gray mold, Northwest; Cylindrocladium scoparium, NJ; Phytophthora cinnamomi, MD; Sparassis radicata, MT to OR, WA.

  • Rot, Wood. Polyporus spp.; Poria spp.; Stereum spp., widespread.

  • Rust. Melampsora paradoxa (0, I), northern U.S. including AK; II, III on willow; M. larici-populina (0, I), Quebec, Canada, WA; II, III on poplar; M. medusae (0, I), New England to MI and IN; II, III on poplar; M. medusae f. sp. deltoidea (0, I), WA; II, III on poplar; Melampsoridium betulinum (0, I), CT, WI; II, III on birch.

  • Wood Decay fungi associated with woodpecker nest cavities: Coniophora puteana, Gloeophyllum sepiarium, Oligoporus placentus, Stereum sanguinolentum, Neolentinus lepideus, Phaelous schweinitzii, Wolfiporia cocos, OR.

LAUREL

  • See California-Laurel, Cherry-Laurel, Mountain-Laurel.

LAUREL, SWEET BAY (Laurus)

  • Blight, Ramorum. Phytophthora ramorum, PA.

  • Blight, Thread. Pellicularia koleroga, SC.

LAURESTINUS (Viburnum tinus)

  • Downy Mildew. Plasmopara viburni, GA.

  • Leaf Spot. Hendersonia tini, LA; Leptosphaeria tini, LA.

  • Leaf Spot, Algal. Cephaleuros virescens, FL, LA.

  • Nematode, Root Knot. Meloidogyne sp., CA.

  • Powdery Mildew. Erysiphe viburni, CA.

  • Virus. Alfalfa Mosaic, Chile.

  • Wilt. Verticillium albo-atrum, OR.

LAVENDER (Lavandula)

  • Bacterial Leaf Disease. Xanthomonas campestris, CA.

  • Leaf Spot. Septoria lavandulae, OH, OK.

  • Nematode, Root Knot. Meloidogyne sp.

  • Rot, Root. Armillaria mellea, TX.

LEADTREE (Leucaena)

  • Rot, Root. Ganoderma sulcatum, TX.

  • Rust. Ravenelia leucaenae (II, III), TX.

LEATHERWOOD (Dirca)

  • Rust. Puccinia dioicae (I), ME to MN, MO, AL; II, III on Carex.

LEBBEK (Albizzia lebbek)

  • Leaf Spot, Algal. Cephaleuros virescens, FL.

  • Rust. Sphaerophragmium acaciae, FL.

LEDUM (Labrador-Tea)

  • Gall, Leaf. Exobasidium vaccinii, AK, OR, WA; Synchytrium vaccinii, red spot, ME.

  • Leaf Spot. Ascochyta ledi, WI; Cryptostictis arbuti, CA, OR; Rhytisma andromedae, tar spot, ID.

  • Powdery Mildew. Microsphaera alni, WA.

  • Rust. Chrysomyxa ledi (II, III), CA, CT, ID, MI, MT, NV, NH, NY, WI, WY; C. ledicola (II, III), AK, ME, NH, NY, WA, WI; 0, I on spruce.

  • Spot Anthracnose. Elsinoë ledi, CA, ME, MI, MN, NY, OR, PA, WA, WI.

LEMON

  • See Citrus Fruits.

LEPTOSPERMUM

  • Rot, Root. Armillaria mellea, CA.

LESPEDEZA

  • Leaf and Stem Disease. Cercospora zebrina (clover isolate), NC.

LEUCOSPERMUM

  • Blight. Calonectria colhounii, HI.

  • Wilt. Verticillium dahliae, CA.

LEUCOTHOË

  • Black Mildew. Asterina diplodioides, AL.

  • Blight, Leaf Spot. Cylindrocladium avesiculatum, GA; C. colhounii, NC.

  • Blight, Ramorum. Phytophthora ramorum, PA.

  • Canker, Felt Fungus. Septobasidium pseudopedicellatum, FL.

  • Gall, Leaf. Exobasidium vaccinii, MA, MS, NC.

  • Leaf Spot. Cercospora leucothoës, NJ, NY; Cryptostictis sp.; Guignardia leucothoës, MD, NC, RI, SC, TN, VA; Mycosphaerella leucothoës, NJ; Phyllosticta terminalis, NY to FL; Ramularia andromedae, NJ; Rhytisma decolorans, tar spot, CT, FL, TN, VA. Pestalotia leucothoës, NJ.

  • Powdery Mildew. Microsphaera penicillata, GA.

  • Spot Anthracnose. Elsinoë ledi, FL.

LIGUSTRUM

  • See Privet.

LILAC (Syringa)

  • Anthracnose, Shoot Blight. Gloeosporium syringae, CT, MA.

  • Bacterial Crown Gall. Agrobacterium tumefaciens, CT.

  • Bacterial Blight; Twig Canker. Pseudomonas syringae, northeastern states to AL, IL, Pacific Coast.

  • Blight, Blossom, Shoot. Phytophthora cactorum, IA, MD, MA, MN, NJ; P. syringae, MD, NY; Sclerotinia sclerotiorum, WA.

  • Blight, Cutting. Cylindrocladium scoparium and C. floridanum, FL, OH.

  • Blight, Gray Mold. Botrytis cinerea. Pacific Northwest, Northeast.

  • Blight, Ramorum. Phytophthora ramorum, PA.

  • Blight, Thread. Pellicularia koleroga, FL, MS, NC.

  • Bacterial, Witches Broom. MLO, IL.

  • Blotch, Leaf. Heterosporium syringae, NJ; Cladosporium herbarum, secondary, cosmopolitan.

  • Canker; Stem Girdle. Hymenochaete agglutinans, CT.

  • Canker; Dieback. Physalospora obtusa, MA to VA, OH.

  • Leaf Spot. Cercospora lilacis, widespread; Macrophoma halstedii, CT, NJ, NY; Phyllosticta sp., MA; Pleospora herbarum, secondary, MD.

  • Nematode, Citrus. Tylenchulus semipenetrans.

  • Nonparasitic. Blight. Graft incompatibility of lilac scion on privet stock.

  • Powdery Mildew. Microsphaera alni, general.

  • Phytoplasma. Witches’ Broom, IL; Ash Yellows, MD, ND.

  • Rot, Root. Phymatotrichum omnivorum, TX; Armillaria mellea, CA, MS; Thielaviopis basicola, CT.

  • Rot, Wood. Polyporus gilvus, MD; Stereum purpureum, OK.

  • Virus. Lilac Mottle; Lilac Ring Spot, MI, MN; Lilac Witches’ Broom, MD.

  • Powdery mildew is the most general and conspicuous disease of lilacs, but it comes too late in the season to damage the bushes materially. It can be controlled with repeated application of GreenCure, sulfur, or Karathane, where the time and expense are justified. In wet seasons bacterial and Phytophthora blights may be important, but dieback is more often due to borers than to diseases.

LINDEN, BASSWOOD (Tilia)

  • Anthracnose; Leaf Spot. Gnomonia tiliae (Gloeosporium tiliae), CT to VA, IA, MN.

  • Blight, Leaf. Cercospora microsora, general.

  • Canker, Bark. Aleurodiscus acerinus; A. griseo-canus, IA, MO, PA.

  • Canker; Dieback. Botryosphaeria sp., MD; Nectria spp., NY, PA, VA; Strumella sp., NJ.

  • Canker, Felt Fungus. Septobasidium fumigatum, FL.

  • Leaf Spot. Phlyctema tiliae, NY; Phyllosticta praetervisa, WI; Sphaeropsis sp., OK.

  • Mistletoe. Phoradendron serotinum (flavescens), South.

  • Powdery Mildew. Microsphaera alni, MN; Phyllactinia corylea, MN; Uncinula clintonii, general.

  • Rot, Heart. Daedalea confragosa, VT; Fomes spp.; Steccherinum septentrionale, AL, MI; Pholiota adiposa, MA, PA, TN.

  • Rot, Root. Phymatotrichum omnivorum, TX; Ustulina vulgaris, NY; Phytophthora dreschleri, NC.

  • Rot, Sapwood. Collybia velutipes, occasional; Pleurotus ostreatus, cosmopolitan.

  • Rot, Wood. Daldinia concentrica, MN, NY; Lenzites betulina, NY, VT; Schizophyllum commune, MN; Polyporus spp.; Stereum spp.; Trametes mollis, VT.

  • Sooty Mold. Fumago vagans.

  • Spot Anthracnose. Elsinoë tiliae, VA.

  • Wilt. Verticillium albo-atrum, IL.

  • Anthracnose and Cercospora leaf blight are common diseases.

LIPSTICK VINE (Aeschynanthus)

  • Leaf Spot. Corynespora casiicola, FL; Myrothecium roridum, FL.

  • Virus. Tomato Spotted Wilt, PA.

LITHOCARPUS (Tanbark Oak)

  • Blight, Leaf. Pestalotia castagnei, CA.

  • Blight, Sudden Oak Death. Phytophthora ramorum, CA. OR.

  • Canker. Phytophthora ramorum, P. nemorosa, P. gonapodyides, P. cambivora, P. siskiyouensis, P. taxon, OR.

  • Leaf Spot. Ceuthocarpum conflictum, CA.

  • Powdery Mildew. Erysiphe trina, CA.

  • Rot, Wood. Poria spp.; Stereum hirsutum.

  • Rust. Cronartium quercuum (II, III), CA; 0, I on pine.

  • Wilt. Phytophthora ramorum, CA, OR.

LITSEA (Pond-Spice)

  • Leaf Spot. Cercospora olivacea, GA.

  • Wilt, Laurel. Raffaelea lauricola, FL.

LOCUST (Robinia)

  • Anthracnose; Black Locust. Colletotrichum gloeosporioides, GA, SC.

  • Bacterial, Mlo. Witches’ Broom, VA.

  • Blight, Seedling; Leaf. Alternaria sp., NC to AL, MO; Fusicladium robiniae, MD to AL, MO, WI.

  • Canker. Nectria cinnabarina, VA.

  • Canker; Twig Blight. Aglaospora anomala, ME to GA; Fusarium sarcochroum, IA; Diaporthe oncostoma, NY to GA, IL.

  • Damping-Off. Rhizoctonia solani, ME to AL, NE, TX; Pythium spp., NE, TX.

  • Dodder. Cuscuta sp.; C. arvensis, widespread.

  • Leaf Spot. Cladosporium epiphyllum, TN, VA, WV; Cylindrosporium solitarium, TX; Gloeosporium revolutum, NJ; Phloeospora robiniae, NY to OH; Phyllosticta robiniae, LA.

  • Mistletoe. Phoradendron serotinum (flavescens), AZ, NM, NC, TX; Viscum album, CA.

  • Nematode, Lesion. Pratylenchus sp., OR.

  • Nematode, Root Knot. Meloidogyne spp., OK, TX.

  • Nonparasitic Chlorosis. Iron Deficiency, NE, TX.
    • Little Leaf. Zinc deficiency, CA.

  • Powdery Mildew. Erysiphe polygoni, CA; Microsphaera diffusa, IL, NC; Phyllactinia corylea, NM.

  • Rot, Heart. Fomes spp., F. rimosus, VA; Polyporus spp.

  • Rot, Root. Armillaria mellea; Phymatotrichum omnivorum, NM, OK; Pythium myriotylum, NC; Fusarium sp., AL, GA.

  • Rot, Seedling Stem. Phytophthora cinnamomi, MD; Rhizoctonia bataticola, AL, NC; Sclerotium bataticola, TX.

  • Rot, Wood. Daedalea unicolor, WI; Poria spp.

  • Virus. Locust Witches’ Broom, Robinia Brooming Disease, PA to GA, AR, OH.

  • Wilt, Seedling. Phytophthora parasitica, AL, NC, VA; Verticillium albo-atrum, IL.

LOGANBERRY

  • See Blackberry.

LOQUAT (Eriobotrya)

  • Anthracnose; Flower Blight; Withertip. Colletotrichum gloeosporioides, CA, FL, TX.

  • Bacterial Fire Blight. Erwinia amylovora, Gulf states, AZ, CA.

  • Blight, Leaf; Blotch. Fabraea maculata, FL.

  • Leaf Spot. Phyllosticta eriobotryae, FL; Pestalotia sp., secondary; Septoria eriobotryae, FL.

  • Leaf Spot, Algal. Cephaleuros virescens, FL.

  • Nematode, Burrowing. Radopholus similis, FL.

  • Rot, Collar, Crown. Phytophthora cactorum, CA.

  • Rot, Root. Armillaria mellea, CA; Clitocybe tabescens, FL; Phymatotrichum omnivorum, TX.

  • Scab. Fusicladium eriobotryae, on leaves, stems, fruit, Gulf states; Spilocaea eriobotryae (Fusicladium photinicola).

LUCUMA (Canistel, Egg-Fruit)

  • Anthracnose; Fruit Spot. Colletotrichum gloeosporioides, FL.

  • Canker. Physalospora obtusa, SC.

  • Rust. Achrotelium lucumae (II, III), FL.

LYCHEE

  • Rot, Mushroom Rot. Clitocybe tabescens, sometimes fatal in FL.

LYCIUM (Desert-Thorn, Christmasberry)

  • Leaf Spot. Cercospora lycii, OK.

  • Powdery Mildew. Arthrocladiella mongeotii, WA.

  • Rot, Root. Phymatotrichum omnivorum, TX.

  • Rust. Aecidium lycii (0, I), AZ; Puccinia globosipes (II, III), UT to NM, CA; 0, I unknown; P. tumidipes (II, III), TX to AZ, UT.

LYONIA (Maleberry, Fetterbush, Staggerbush)

  • Black Mildew. Asterina lepidigena, FL; Lembosia andromedae, AL; Morenoella dothideoides, FL.

  • Blight, Leaf. Ramularia cylindriopsis, ME.

  • Dodder. Cuscuta compacta, FL.

  • Gall, Leaf; Shoot Hypertrophy. Exobasidium vaccinii, MA to FL, AL.

  • Leaf Spot. Ceuthocarpon ferrugineum, FL; Pestalotia vaccinii, secondary; Septoria pulchella, GA.

  • Leaf Spot, Tar. Rhytisma andromedae, widespread; R. decolorans, MS.

  • Powdery Mildew. Microsphaera alni var. vaccinii, AL.

  • Rot, Wood. Poria versipora, ME.

  • Rust. Pucciniastrum myrtilli (II, III), DE to AL, AR; 0, I on hemlock.

LYSILOMA

  • Rot, White Pocket Heart. Fomes extensus, FL.

  • Rust. Ravenelia annulata (II, III), FL; R. lysilomae, FL.

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • R. Kenneth Horst
    • 1
  1. 1.Plant Pathology and Plant Microbe BiologyCornell UniversityIthacaUSA

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