Leaffolder on RICE (Cnaphalocrosis medinalis)

LIFE CYCLE:
Leaf rollers complete a full life cycle in a month.

DAMAGE:
-Scalding the leaf surface and became whitish streaks on leaf blades.
-Fold the leaf tips on the larva stage and feed the leaf tissues.
-Pest outbreak in short time if no action of control taken, infestation the whole field in just few days time.
-Larva stage is actively feeding on the leaves tissues during tillering to booting stage and they will spin the web to make the upper leaves into longitudinally folded.
-Larva is naturally favour to feed on young rice plants, especially those with high Nitrogen fertilized.

Heavily infested by leaffolders during active tillering stage

Infestation of leaffolders on hardening stage

Older leaves is folded like spikes

Larva Stage of leaffolder

Adult of leaffolder

CHEMICAL CONTROL:
-In general, most of the insecticides in the rice market can have good control on leaf rollers. e.g. buprofenzin (Applaud), cartap (Padan), acephate.
-Imidacloprid (Nuprid, Confidor), thiamethoxam (Actara) and dichlorvos (CH dichlorvos 42) have broad-spectrum control on planthopper, leafrollers as well as stem borer.

 Additional info:

http://www.scribd.com/doc/209942573/Integrated-pest-management-of-leaf-folder-Cnaphalocrocis-medinalis-Guen-in-rice
http://www.cropscience.bayer.com/Crop-Compendium/Pests-Diseases-Weeds/Pests/Cnaphalocrocis-medinalis.aspx
http://www.fintrac.com/cpanelx_pu/cambodia/12_13_5906_Technical-Bulletin-44-Rice-Leaffolder-English%20revised.pdf
http://www.knowledgebank.irri.org/decision-tools/rice-doctor/rice-doctor-fact-sheets/item/rice-leaffolder?category_id=345