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Plantwise Technical Factsheet

rice leafroller (Marasmia patnalis)

Host plants / species affected
Cynodon dactylon (Bermuda grass)
Cyperus difformis (small-flowered nutsedge)
Cyperus iria (rice flatsedge)
Cyperus rotundus (purple nutsedge)
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)
Paspalum conjugatum (sour paspalum)
Paspalum distichum (knotgrass)
Paspalum scrobiculatum (ricegrass paspalum)
Saccharum officinarum (sugarcane)
Sorghum bicolor (sorghum)
Sporobolus (Dropseed)
Zea mays (maize)
List of symptoms/signs
Leaves  -  abnormal colours
Leaves  -  external feeding
Leaves  -  leaves rolled or folded
Leaves  -  webbing
Symptoms
Rice plants attacked by M. patnalis are defoliated and the affected leaves are scorched or white, plastic and not distinguishable from those damaged by Cnaphalocrocis medinalis.

Before feeding, the larvae fold back the leaves longitudinally by stitching the leaf margins. The desiccation of the band facilitates contraction of the silk stitches and the leaf rolls in the process. Once protected, the larvae scrape and feed on the green tissues or the green mesophyll layer of the rice leaves resulting in the appearance of linear, pale-white stripes. In severe infestations, damaged plants appear sickly and scorched.
Prevention and control
Host-Plant Resistance

Wild rices are potential donors of resistance to rice leaffolders. At present, only six selected rice varieties (Ptb 33, ASD5, TKM6, IR4707-106-3-2, Darukasail and GEB24) are resistant to both Cnaphalocrocis medinalis and M. patnalis (Joshi et al., 1985).

Cultural control

Cultural methods used to control M. patnalis are as for C. medinalis. Wider spacing (22.5 x 20 cm and 30 x 20 cm) and low usage of nitrogen fertilizer decrease the percentage of leaffolder infestation. Early planting is recommended to escape a high degree of defoliation.

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. patnalis is a minor pest of rice. No outbreaks of this leaffolder have been recorded.
Related treatment support
 
External factsheets
TNAU Agritech Portal Crop Protection Factsheets, Tamil Nadu Agricultural University, English language
TNAU Agritech Portal Crop Protection Factsheets, Tamil Nadu Agricultural University, Tamil language
Rice Insect and Pest Control Management Factsheets, Bangladesh Rice Research Institute (BRRI), Bengali language
IRRI Factsheets, International Rice Research Institute (IRRI), English language
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