DISEASES IN RICE

ByLove Kumar Sharma

LEAF BLAST

Caused by Pyricularia grisea

Eye spindle shaped spots appear on leaves

It starts from lower leaves to upper

Brown margins with greyish centre

Lesion enlarge, coalesce and kill the leaves

NODE BLAST Caused by same

pathogen Patches on infected

nodes, black in colour Irregular lesions on

nodes Above the infected

nodes, all parts die Lesions are blackish to

greyish brown and break at the infected node

NECK BLAST Greyish brown lesions

on neck Girdling of neck and

grains fall over Discolouration of grains After infection poor

quality grains are formed

Lesions on the panicle branches, spikes and spikelet's

SHEATH BLIGHT

Caused by Rhizoctonia solani

Generally appear at max. tillering stage

Irregular long lesions on leaf sheath

Effect all parts of crop above water level

Centre of lesion bleached with an irregular purple brown border

SHEATH BLIGHT

Sclerotia at basal portion of leaf sheath

White in colour when appear and turn into dark brown later

Soil borne pathogen More common in rainy

seasons

SHEATH ROT

Caused by Sarocladium oryzae

Irregular spots on leaf sheath chocolate brown in colour

It occurs during heading to maturity stages

Discolouration and dried up of grains

FALSE SMUT

Caused by Ustilaginoidea virens

Occurrence of smut after flowering

Appearance of yellowish and soft balls on grains

Few grains infected and the rest are normal

First found in Haryana and Punjab

BROWN SPOT Caused by

Helminthosporium oryzae

Spreaded by wind blown spores

Circular to oval shaped reddish brown lesions on leaves

Spots are surrounded by yellow or gold halo

Pathogen is seed borne

BACTERIAL LEAF BLIGHT Caused by Xanthomonas

campestris pv. Oryzae Water soaked lesions and

turns yellow to straw colour stripes

Causes drying and death of the leaves

leaves roll, droop and plants die completely

Milky dew drops ooze out from the affected areas

TUNGRO

Spreading by GLH Nephotettix virescens and N.nigropictus

Discolouration of leaf from light green to orange yellow

Damage can caused by virus and insect also

Decrease tiller growth and stunted plant growth

It can occur at any stage from sowing to maturity

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