1. DISEASES IN RICE
By
Love Kumar Sharma

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. THANK YOU