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Current Category » Introductory Plant Pathology

Classification of Sub-division of Deuteromycotina

i) Budding ( yeast or yeast like) cells with or without pseudomycelium. True mycelium lacking or not well developed.

ii) Mycelium well developed assimilative budding cells absent.

Sub division of Deuteromycotina
Class –Hyphomycetes
Order-Hyphomycetales

Family: Monliaceae ( Hyphae, Conidia and Conidiophores are hyaline or colourless)

Genus: Pyricularia Conidiophores long, slender, simple, rarely branched septate, Pyriform conidia 2 to 3 celled. E.g. P.oryzae- Blast of rice.

Family: Dematiaceae  ( Hyphae, Conidia are coloured)

Genus1: Alternaria
Conidia and conidiophores are coloured.
Muriform type condidia.
E.g. A.solani-Early blight of tomato and potato

Genus2: Cercospora
Conidia multiseptate, worm like.
e.g. C.arachidicola- Tikka of G.nut.
 
Genus3: Helminthsporium
Conidia 3 to many celled.
E.g. H.oryzae- Brown spot of paddy.

Genus4 : Drechslera
Conidia mullticelled
e.g. D.maydis – Blight of Corn

Sub Division of Deuteromycotina

Class- Hyphoycetes
Order- Aganomycetales
Family- Aganomycetaceae

Genus: Rhizoctonia
They are formed in soil ad black in colour having size 100µ. E.g. R.solani-root rot of tomato

Genus: Sclerotium
They are formed as white cottony growth on the infected portion of plant brown in colour having size 100 -300 µ.E.g. S.oryzae- Steam rot of paddy.

Sub-Division Deteromycotina

Class- Coelomycetes

i) Order- Melanconiales
Family:
Melanconiaceae
Genus: Colletotrichum
Conidiophores are brown hyaline septate branched sickle shaped having rounded ends. E.g. C.falcatum –red rot of sugarcane

Genus: Pestolatia
Conidia multiseptate, fusiform type, 2 to 5 septa. 3 to 9 apical, simple branched appendages. E.g. P.theae-grey blight on tea.

ii) Order- Sphaeropsidiales
Family:
Sphaeropsidiaccae
Genus: Septoria,
Leaf spot of fungus
E.g. S. thespesiae- septotria leaf spot, S.avenae-leaf spot oat.

Current Category » Introductory Plant Pathology