Common Names of Plant Diseases

Diseases of Azalea
(Rhododendron spp.)

D. M. Benson, primary collator (last update 4/8/03)

FUNGAL DISEASES

Anthracnose

Glomerella cingulata (Stoneman) Spauld. & H. Schrenk

    Colletotrichum gloeosporioides (Penz.) Penz. & Sacc.

    in Penz. [anamorph]

Armillaria root rot (shoestring root rot)

Armillaria mellea (Vahl: Fr.) P. Kumm.

    Rhizomorpha subcorticalis Pers. [anamorph]

Botrytis petal blight

Botrytis cinerea Pers.: Fr.

    Botryotinia fuckeliana (de Bary) Whetzel [teleomorph]

Bud and twig blight

Pycnostysanus azaleae (Peck) E. Mason

= Briosia azaleae (Peck) Dearn.

Cercospora leaf spot

Pseudocercospora handelii (Bubak) Deighton

= Cercospora handelii Bubak

Clitocybe root rot (mushroom root rot)

Armillaria tabescens (Scop.) Dennis et al.

= Clitocybe tabescens (Scop.) Bres.

Cylindrocladium blight and root rot

Cylindrocladium scoparium Morg.

= C. floridanum Sobers & C. P. Seymour

    Calonectria kyotensis Terashita [teleomorph]

Cylindrocladium theae (Petch) Subramanian

    Calonectria theae C. A. Loos [teleomorph]

Damping-off, Pythium

Pythium spp.

P. irregulare Buisman

Damping-off, Rhizoctonia

Rhizoctonia solani Kühn

    Thanatephorus cucumeris (A. B. Frank) Donk

    [teleomorph]

Exobasidium leaf spot

Exobasidium burtii Zeller

Leaf scorch

Septoria azalea Voglino

Leaf and flower gall

Exobasidium vaccinii (Fuckel) Woronin

= E. azaleae Peck

Ovulinia petal blight

Ovulinia azaleae Weiss

    Ovulitis azaleae Buchwald [anamorph]

Pestalotia leaf spot twig blight, and crown rot

Pestalotiopsis sydowiana (Bres.) Sutton

= Pestalotia rhododendri Guba non Westend., hom. illeg.

Phomopsis dieback

Phomopsis spp.

Phyllosticta leaf spot

Phyllosticta spp.

Phytophthora blight and dieback

Phytophthora nicotianae Breda de Haan var. parasitica

    (Dastur) G. M. Waterhouse

= P. parasitica Dastur

Phytophthora root rot and wilt

Phytophthora cinnamomi Rands

P. nicotianae Breda de Haan var. parasitica (Dastur)

    G. M. Waterhouse

Powdery mildew

Erysiphe polygoni DC.

Microsphaera penicillata (Wallr.:Fr.) Lev.

Pucciniastrum leaf rust

Pucciniastrum vaccinii (G. Wint.) Jorst.

Twig blight

Monilinia azaleae Honey

Web blight

Rhizoctonia ramicola G. F. Weber & D. A. Roberts

    Ceratobasidium ramicola Tu et al. [teleomorph]

Rhizoctonia sp. (binucleate)

NEMATODE DISEASES

Dagger, American

Xiphinema americanum Cobb

Pin

Paratylenchus curvitatus Springer

Root-knot

Meloidogyne spp.

Sheath

Hemicycliophora spp.

Spiral

Rotylenchus buxophilus Golden

R. robustus (De Man) Filipjev

Stubby-root

Paratrichodorus minor (Colbran) Siddiqi

Stunt

Tylenchorhynchus claytoni Steiner

PARASITIC HIGHER PLANTS

Dodder

Cuscuta gronovii Willd.

UNDETERMINED ETIOLOGY

Witches' broom

Undetermined