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Plantwise Technical Factsheet

rice leaf roller (Marasmia exigua)

Host plants / species affected
Cynodon dactylon (Bermuda grass)
Cyperus (flatsedge)
Dactyloctenium aegyptium (crowfoot grass)
Echinochloa colona (junglerice)
Echinochloa crus-galli (barnyard grass)
Imperata cylindrica (cogon grass)
Leersia hexandra (southern cut grass)
Leptochloa chinensis (Chinese sprangletop)
Oryza sativa (rice)
Panicum repens (torpedo grass)
Paspalum
Paspalum conjugatum (sour paspalum)
Paspalum distichum (knotgrass)
Sorghum bicolor (sorghum)
Sporobolus (Dropseed)
Urochloa mutica (para grass)
Zea mays (maize)
List of symptoms/signs
Leaves  -  external feeding
Leaves  -  leaves rolled or folded
Symptoms
Rice leaves become folded, or two or more leaves may become glued together, as a result of attack by M. exigua. The larva feeds inside the chamber producing longitudinally scraped, whitish leaves without chlorophyll.
Prevention and control
Host-Plant Resistance

There are no data available on host plant resistance to M. exigua.

Cultural control

The population of M. exigua may be reduced by the application of low rates of nitrogen fertilizer and increasing plant spacing at planting.

Biological control

There are many natural enemies which regulate the build-up of M. exigua populations. Most of these parasitoids and predators also attack Cnaphalocrocis medinalis.

Trathala flavoorbitalis is an effective parasitoid, killing 43% of larvae in south-east Viti Levu, Fiji, when annual rainfall is high (123 inches).

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Impact
M. exigua does not have an outbreak record and remains a minor pest of rice.
Related treatment support
Plantwise Factsheets for Farmers
Zhang, W.; Li, H.; Peng, H.; CABI, 2012, Chinese language
 
 
External factsheets
IRRI Factsheets, International Rice Research Institute (IRRI), English language
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