2. 2
Insect pest of Rice
a) Stem borers
1. Yellow stem borer, Scirpophaga incertula
2. Gall fly or Gall midge, Orseolia oryzae
GM
3. 3
Insect pest of Rice
b) Leaf feeders
1.Whorl maggot, Hydrellia sasakii
2. Swarming caterpillar, Spodoptera mauritia
3. Case worm, Nymphula depunctalis
4. Leaf folder, Cnaphalocrosis medinalis
Marasmia patnalis
5. Skipper butterfly, Pelopides mathias
GM
4. 4
Insect pest of Rice
b) Leaf feeders …
6. Green horned caterpillar,
Melanitis leda ismene
7. Hispa or spiny beetle, Dicladispa armigera
8. Grass hopper,
Oxya nitidula
Hieroglyphus banyan
GM
5. 5
Insect pest of Rice
c) Sap feeders
1. Thrips, Stencheatothrips biformis
2. Green leafhopper, Nephotettix nigropictus
N. cincticeps , N. impicticeps
3. White leaf hopper, Cofana spectra
4. Zig zag leaf hopper, Recilia dorsalis
5. Brown plant hopper, Nilaparvata lugens
6. Ear head bug, Leptocorisa acuta
GM
10. 10
Fecundity:
•15-80 eggs/Adult
- in mass near tip on upper surface of
tender leaf blade during night and cover
them with buff coloured hairs and scales –
derived from anal tuft.
• 2-3 egg masses /female
• Incubation period : 5 – 8 days
GM
11. 11
• One larva bores into the stem near nodal region
• Usually 1 larva/stem, but 2-4 larvae/stem also
reported
• Larva – Migratory
• come out of stem and prepare an enclosing case
• infest new plant
GM
• Pale white with dark brown head and
prothoracic shield
• Enter leaf sheath and feed for 2-3 days
Larva:
12. 12
Larva.. Cont..
• Larval period – 33 - 41 days
• length – 20 mm
• Before pupation, larva plug the exit hole
GM
Pupa: in silken cocoon
• Dark brown
• 12 mm long
• Pupal period - 6-10 days (may get prolonged
depending upon the weather condition)
13. 13
Moth
• Attracted to light
• Female:male – 2:1
• Cold weather
• high humidity &
• low temperature
15. 15
Hollow cavity in the rice stem
Symptoms of Rice gall midge
Orseolia oryzae
Diptera : Cecidomyiidae
Silver shoots of gall midge larvae.
GM
Onion Leaf
20. 20
Damage field leaves dry up and turn white
Floating larval case
Leaf blades are cut as by scissors
Larval head come out from case
Rice case worm
Nymphula depunctalis
Lepidoptera : Pyralidae
GM
AGB 3201 :Plant Protection and Epidemiology – Rice ecosystem-Insect pests Dr.G.Mikunthan
55. 55
End of Part 1:Insect pests
GM
AGB 3201 :Plant Protection and Epidemiology – Rice ecosystem-Insect pests Dr.G.Mikunthan
Acknowledgement:
1. International Rice Research Institute, Philippines
2. Department of Agriculture, Ministry of Agriculture, Sri Lanka