Table of content

  • Introduction of the Insect
  • Classification
  • Distribution and Status
  • Identification
  • Problems with Identical signs
  • Habit and Habitat
  • Life cycle (Bionomics)
  • Damage
  • Common signs and symptoms of infestation
  • Symptoms of damage
  • Why is it important?
  • Management
  • Cultural practices
  • Biological control
  • Chemical treatment
  • Restrictions
  • Genome sequences
  • Published research.
  • References

Rice leafroller

Introduction of the Insect

Marasmia patnalis is a moth in the family Crambidae. It was described by John David Bradley in 1981.[1]
 

English name        Rice leafroller

Bangla name         NO INFORMATION AVAILABLE

Scientific name     Marasmia patnalis

Domain:      Eukaryota

Kingdom:    Animalia

Phylum:       Arthropoda

Class:           Insecta

Order:           Lepidoptera

Family:         Crambidae

Genus:          Marasmia

Species:        M. patnalis

 

Binomial Name: Marasmia patnalis (Bradley, 1981)

Synonym: Cnaphalocrocis patnalis (Bradley, 1981)

It is found in south-east Asia, where it has been recorded from Sri Lanka, India, Malaysia, Indonesia and the Philippines. [1]
 

Host Range

The larvae feed on Cynodon dactylon, Cyperus difformis, Cyperus iria, Cyperus rotundus, Dactyloctenium aegyptium, Echinochloa colona, Echinochloa crus-galli, Imperata cylindrica, Leersia hexandra, Leptochloa chinensis, Oryza sativa, Paspalum conjugatum, Paspalum distichum, Paspalum scrobiculatum, Saccharum officinarum, Sorghum bicolor, Sporobolus and Zea mays. Young larvae fold back the leaves longitudinally. They then feed on the green tissues or the green mesophyll layer [1].

Egg:           [NO INFORMATION AVAILABLE]

Nymph:     [NO INFORMATION AVAILABLE]

Adult:        Body is light brown in color, with black stripes on the wings.

Cnaphalocrocis medinalis causes similar symptoms of damage. Moreover, M. bilinealis (Hmps.), M. ruralis (Wlk.), and M. suspicalis (Wlk.) had previously been confused because of similarity of the adults and shared host-plant association [3].
 

[NO INFORMATION AVAILABLE]

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M. patnalis is a minor pest of rice. No outbreaks of this leaffolder have been recorded [3].

Rice plants attacked by M. patnalis are defoliated and the affected leaves are scorched or white, plastic and indistinguishable 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.

Plants/Leaves/abnormal colours
Plants/Leaves/external feeding
Plants/Leaves/leaves rolled or folded
Plants/Leaves/webbing

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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.

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).

 

 

Findings indicate that S. indicumis is well suited for use as an ecological engineering plant in the margins of rice crops. Sesame indicum can be a valuable crop as well as providing benefits to C. lividipennis whilst denying benefit to key pests [4].

There is no information available on the use of chemicals to control M. patnalis. Chemical control is not required as the plant can readily compensate for the defoliation caused by this pest.

No information found

No information found

https://www.sciencedirect.com/science/article/abs/pii/S1226861516303855

https://www.cabdirect.org/cabdirect/abstract/20097401401

https://pubmed.ncbi.nlm.nih.gov/25541304/

https://en.wikipedia.org/wiki/Cnaphalocrocis_patnalis

https://plantwiseplusknowledgebank.org/doi/10.1079/PWKB.Species.32497#tabular-2

https://plantwiseplusknowledgebank.org/doi/10.1079/PWKB.Species.32497

https://pubmed.ncbi.nlm.nih.gov/25254377/

https://www.cambridge.org/core/journals/bulletin-of-entomological-research/article/abs/marasmia-patnalis-sp-n-lepidoptera-pyralidae-on-rice-in-se-asia/F8DCC5F787B030CDDB9446BB6E8563F4