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Digital Guide to Moth Identification

990115.0019115Chilo suppressalis – Asiatic Rice Borer Moth – (Walker, 1863)

Christi Jaeger, MEM
Distribution: Asia and India
Seasonality
and Size:
Generations per year dependent on climate, in tropical areas, up to six generations is typical.
Wingspan 20-30mm.
Larva and
Host Plants:
Larvae are pale yellowish white, with four abdominal prolegs, head capsule light yellow changing to brown in later instars (2). Larvae bore into stems of rice. Host records include sorghum, cabbage, broccoli, cauliflower, kale, brussel sprouts, millet, sugarcane, and corn.
Description/
Field Marks:
Forewings straw colored, uniformly suffused with yellowish brown, out margin with row of small dark brown spots. Hindwing uniformly white. Labial palp porrect, three times as long as eye. Sharply pointed, forward pointing frons, with ridgelike ventral margin. Ocelli present.
Similar Species: Easily confused with C. plejadellus. Male S. suppresalis adults may be distinguished from other species of Chilo by the presence of a ridge on the lower margin of the conical front between the eyes. Genitalia of male C. suppresalis distinguished from C. plejadellus by the absence of a short, sharp, subapical tooth on each arm of the juxta (2).

Male genitalia of C. erianthallus can be distinguished by pointed vinculum that is as long as it is wide (width measured at base where it meets the valve). Vinculum in C. suppresalis is rounded at the apex, and is at least 1.5 times longer than it is wide (as measured from the base where it meets the valve). Superficially resembles Diatraea saccharalis, or D. lineolata; to distinguish them, examine the frons which is convex in D. saccharalis and D. lineolata, and forwarding pointing in Chilo. Furthermor, Diatraea lack an ocellus, which is present in Chilo (4)
References
  • (1) Natural History Museum: HOSTS- website
  • (2) CAPS Corn pest descriptions website
  • (3) Passoa. 2009. Screening key for CAPS target Pyraloidea in the Eastern and Midwestern United States (males) website
  • (4) Khan, Z.R., Litsinger, J.A., Barrion, A.T., Villanueva, F.F.D., Fernandex, N.J., and Taylo, L.D. 1991. World Bibliography of Rice Stem Borers 1795-1990. International Rice Research Institute
  • (5) Species Page at BOLD Barcoding Project - website.
Data compiled and contributed by Christi Jaeger, MEM from references cited.

Chilo suppressalis
– Christi Jaeger, MEM

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