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Top Borer

Scientific Name
Chilo infuscatellus
Scientific Author
Snellen 1890
Taxonomy
(Lepidoptera:Crambidae)
Status
Exotic species - absent from Australia
Reliability
High
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Diagnostic Images

Antennae
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Caption
PNG 27.vii.2009 Ramu Sugar
Source
S. Anderson DAFF Biosecurity
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Diagnostic Images (12)
Diagnostic Notes
Identification is currently undergoing peer review as part of the National Diagnostic Protocols by SPHDS.

Early instar larvae feed on the outer leaves of the plant, the 3rd instar bores and eats through the core of the plant and spoils the growing point. The central whorl begins to shrivel yielding dead hearts. Larvae then exit the central whorl and bore into adjacent healthy shoots. Usual infestation occurs in early stages before node formation but again may continue depending on climatic conditions suitable for the top borer (Sallam & Allsopp 2002).

Larvae dorsally has 5 longitudinal stripes; spiracles open, oval in outline with black rim; crochets on prolegs multiordinal, arranged in incomplete circles, final instar larva loses all but 1 thin median stripe.

Adult ocellus well developed; labial palpus 3 ♂ to 3.5 ♀ x as long as diameter of eye; face rounded, slightly protruding forward beyond eye; forewing length 10-13 mm, R1 confluent with Sc, ground colour and maculation variable, dull from light sand yellow to chocolate brown, discal dot present or variably reduced, transverse lines present or absent, terminal dots present, metallic scales absent; hindwing dirty white ♂ silky white ♀.

Genitalia ♂ pars basalis slight; juxta plate symmetrical, arms reaching to basal costal angle of valva, each arm has a toothed strengthening; aedeagus with strong central swelling; single, tapering, large, curved cornutus present.

♀ ostial pouch well demarcated from ductus bursae, heavily sclerotized, deeply incised anteriorly; signum lamellate with a median ridge (Bleszynski 1970).

Coming soon - PBT link with DNA barcoding for Chilo infuscatellus
More Information
Specimen Contact
DAFF Biosecurity Darwin
Author
S. Anderson & L. Tran-Nguyen
Created
13/02/2012 01:37 AEST
Last Updated
24/02/2012 19:23 AEST
Citation
S. Anderson & L. Tran-Nguyen (2012) Top Borer (Chilo infuscatellus) Updated on 2/24/2012 7:23:44 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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