Diseases of Rice
(Oryza sativa L.)

C. A. Hollier, D. E. Groth, M. C. Rush, R. K. Webster, collators (last update 4/7/93)

BACTERIAL DISEASES

Bacterial blight

Xanthomonas oryzae pv. oryzae (Ishiyama) Swings et al.

= X. campestris pv. oryzae (Ishiyama) Dye

Bacterial leaf streak

Xanthomonas oryzae pv. oryzicola (Ishiyama) Swings et al.

Foot rot

Erwinia chrysanthemi Burkholder et al.

Grain rot

Pseudomonas glumae Kurita & Tabei

Pecky rice (kernel spotting)

Damage by bacteria (see also underfungal and miscellaneous diseases)

Sheath brown rot

Pseudomonas fuscovaginae (ex Tanii et al.) Miyajima et al.

FUNGAL DISEASES

Aggregate sheath spot

Ceratobasidium oryzae-sativae Gunnell & Webster

(anamorph: Rhizoctonia oryzae-sativae (Sawada) Mordue)

Black kernel

Curvularia lunata (Wakk.) Boedijn

(teleomorph: Cochiobolus lunatus R.R. Nelson & Haasis)

Blast (leaf, neck [rotten neck], nodal and collar)

Pyricularia grisea Sacc. = P. oryzae Cavara

(teleomorph: Magnaporthe grisea (Hebert) Barr)

Brown spot

Cochliobolus miyabeanus (Ito & Kuribayashi) Drechs. ex Dastur (anamorph: Bipolaris oryzae (Breda de Haan) Shoemaker)

Crown sheath rot

Gaeumannomyces graminis (Sacc.) Arx & D. Olivier

Downy mildew

Sclerophthora macrospora (Sacc.) Thirumalachar et al.

Eyespot

Drechslera gigantea (Heald & F.A. Wolf) Ito

False smut

Ustilaginoidea virens (Cooke) Takah.

Kernel smut

Tilletia barclayana (Bref.) Sacc. & Syd. in Sacc.

= Neovossia horrida (Takah.) Padwick & A. Khan

Leaf smut

Entyloma oryzae Syd. & P. Syd.

Leaf scald

Microdochium oryzae (Hashioka & Yokogi) Samuels & I.C. Hallett = Rhynchosporium oryzae Hashioka & Yokogi

Narrow brown leaf spot

Cercospora janseana (Racib.) O. Const.

= C. oryzae Miyake

(teleomorph: Sphaerulina oryzina K. Hara)

Pecky rice (kernel spotting)

Damage by many fungi including Cochliobolus miyabeanus (Ito & Kuribayashi) Drechs. ex Dastur, Curvularia spp., Fusarium spp., Microdochium oryzae (Hashioka & Yokogi) Samuels & I.C. Halett, Sarocladium oryzae (Sawada) W. Gams & D. Hawksworth and other fungi.

Root rots

Fusarium spp.

Pythium spp.

P. dissotocum Drechs.

P. spinosum Sawada

Seedling blight

Cochliobolus miyabeanus (Ito & Kuribayashi) Drechs. ex
   Dastur, Curvularia spp., Fusarium spp., Rhizoctonia
   solani Kühn, Sclerotium rolfsii Sacc.

(teleomorph: Athelia rolfsii (Curzi) Tu & Kimbrough), and
   other pathogenic fungi.

Sheath blight

Thanatephorus cucumeris (A.B. Frank) Donk

(anamorph: Rhizoctonia solani Kühn)

Sheath rot

Sarocladium oryzae (Sawada) W. Gams & D. Hawksworth

= Acrocylindrium oryzae Sawada

Sheath spot

Rhizoctonia oryzae Ryker & Gooch

Stackburn (Alternaria leaf spot)

Alternaria padwickii (Ganguly) M.B. Ellis

Stem rot

Magnaporthe salvinii (Cattaneo) R. Krause & Webster

(synanamorphs: Sclerotium oryzae Cattaneo, Nakataea
   sigmoidae (Cavara) K. Hara)

Water-mold (seed-rot and seedling disease)

Achlya conspicua Coker

A. klebsiana Pieters

Fusarium spp.

Pythium spp.

P. dissotocum Drechs.

P. spinosum Sawada

MISCELLANEOUS DISEASES OR DISORDERS

Alkalinity or salt damage

Excessive salt concentration in soil or water

Bronzing

Zinc deficiency

Cold injury

Low temperatures

Panicle blight

Cause undetermined

Pecky rice (kernel spotting)

Feeding injury by rice stink bug

Straighthead

Arsenic induced, unknown physiological disorder

White tip (see nematodes)

Aphelenchoides besseyi Christie

NEMATODES, PARASITIC

Crimp nematode, summer

Aphelenchoides besseyi Christie

Root-knot

Meloidogyne spp.

Root nematode, rice

Hirschmaniella oryzae (Soltwedel) Luc & Goodey

Stem nematode, rice

Ditylenchus angustus (Butler) Filipjev

VIRUS DISEASES

Giallume

Barley yellow dwarf virus

Rice black streak dwarf

Rice black streak dwarf virus (RGSDV)

Rice dwarf

Rice dwarf virus (RDV)

Rice grassy stunt

Rice grassy stunt virus (RGSV)

Rice hoja blanca

Rice hoja blanca virus (RHBV)

Rice necrotic mosaic

Rice necrotic mosaic virus (RNMV)

Rice rugged stunt

Rice rugged stunt virus (RRSV)

Rice stripe

Rice stripe virus (RStV)

Rice transitory yellowing

Rice transitory yellowing wirus (RTYV)

Rice yellow dwarf

MLO

Rice yellow mottle

Rice yellow mottle virus (RYMV)

Tungro (rice tungro disease) (RTD)

Rice tungro spherical virus (RTSV)

Rice tungro bacilliform virus (RTBV)