1. PaDIL Species Factsheet Scientific Name: Cathartus quadricollis (Guérin-Méneville, 1844) (Coleoptera: Silvanidae: Silvaninae: Silvanini) Common Name Square-necked grain beetle Live link: http://www.padil.gov.au/pests-and-diseases/Pest/Main/142142 Image Library Australian Biosecurity Live link: http://www.padil.gov.au/pests-and-diseases/ Partners for Australian Biosecurity image library Department of Agriculture, Water and the Environment https://www.awe.gov.au/ Department of Primary Industries and Regional Development, Western Australia https://dpird.wa.gov.au/ Plant Health Australia https://www.planthealthaustralia.com.au/ Museums Victoria https://museumsvictoria.com.au/ 2. Species Information 2.1. Details Specimen Contact: Museum Victoria - [email protected] Author: McCaffrey, Sarah Citation: McCaffrey, Sarah (2011) Square-necked grain beetle(Cathartus quadricollis)Updated on 12/15/2011 Available online: PaDIL - http://www.padil.gov.au Image Use: Free for use under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY- NC 4.0) 2.2. URL Live link: http://www.padil.gov.au/pests-and-diseases/Pest/Main/142142 2.3. Facets Commodity Overview: Field Crops and Pastures Commodity Type: Grains, Stored Products Distribution: Central and South America, USA and Canada Group: Beetles Status: Exotic Regulated Pest - absent from Australia 2.4. Other Names Cathartus annectens Sharp Cathartus cassiae Reiche, 1854 Silvanus gemellatus Jaquelin du Val, 1857 Silvanus quadricollis Guérin-Méneville 2.5. Diagnostic Notes Square-necked grain beetle, _Cathartus quadricollis_ is considered a secondary pest when coexisting with primary pests such as _Sitophilus oryzae_, _Callosobruchus maculatus_, _Rhyzopertha dominica_ and _Sitotroga cerealella_. However, its importance as a pest was recognized when its infestation was second to _Prostephanus truncatus_ and outnumbered species like _Sitophilus zeamais_, _Tribolium castaneum_ (Herbst), _Carpophilus dimidiatus_ and _Cryptolestes ferrugineus_ (Stephens). In warm temperature and tropical areas, such as the Southern United States, Central and South America, and West Africa, _C. quadricollis_ infests maize in the field and is very common in the tropics as a pest of farm- stored maize in subsistence farming. In Brazil, _C. quadricollis_ infestation is also more common in the field. _Cathartus quadricollis_ appear to be restricted to southern USA states and much more widely distributed in Mexico. Source: See weblinks for African Journal of Food Science. A small active beetle which is attracted to ripening crops, it can continue to multiply in storage especially in damaged grain stored slightly damp. Adults are 2.1-3.5 mm in length, light brown in colour, parallel sided and elongate in shape. Optimum conditions for development are about 27°C and 80% R.H.. In maize, infestation begins in the field and continues to develop in storage. The adult beetles will readily fly and have been collected at heights of 70–170m above ground. Source: DAFF Pest Risk Analysis (See weblinks) 2.6. References Anon (1979) Stored Grain Insects. Agriculture Handbook No. 500, USDA, Washington DC : USA, 57pp. Dobie, P., Haines, C.P., Hodges, R.J., Prevett, P.F. (Eds) (1984) Insects and Arachnids of Tropical Stored Products, Their Biology and Identification (A Training Manual). Tropical Development and Research Institute, Berks : United Kingdom, 273 pp. Halstead, D.G.H. (1993) Keys for the identification of beetles associated with stored products II. Laemophloediae, Passandridae and Silvanidae. Journal of Stored Product Research 29: 99- 197. 2.7. Web Links African Journal of Food Science: http://www.academicjournals.org/ajfs/PDF/Pdf2009/Nov/Sousa%20et%20al.pdf DAFF Pest Risk Analysis: http://www.daff.gov.au/__data/assets/pdf_file/0015/21921/TWGP_1.pdf 3. Diagnostic Images Cusco, 1 November 2007, A. Quinones. Cusco, 1 November 2007, A. Quinones. Host: Achiete. Det: G. Tejada, 2007 Host: Achiete. Det: G. Tejada, 2007 Antenna Image: Sarah McCaffrey Museums Dorsal Image: Sarah McCaffrey Museums Victoria Victoria Cusco, 1 November 2007, A. Quinones. Cusco, 1 November 2007, A. Quinones. Host: Achiete. Det: G. Tejada, 2007 Host: Achiete. Det: G. Tejada, 2007 Elytra Image: Sarah McCaffrey Museums Head Front Image: Sarah McCaffrey Victoria Museums Victoria Cusco, 1 November 2007, A. Quinones. Cusco, 1 November 2007, A. Quinones. Host: Achiete. Det: G. Tejada, 2007 Host: Achiete. Det: G. Tejada, 2007 Head Side Image: Sarah McCaffrey Lateral Image: Sarah McCaffrey Museums Museums Victoria Victoria Cusco, 1 November 2007, A. Quinones. Cusco, 1 November 2007, A. Quinones. Host: Achiete. Det: G. Tejada, 2007 Host: Achiete. Det: G. Tejada, 2007 Posterior Image: Sarah McCaffrey Museums Pronotum Image: Sarah McCaffrey Victoria Museums Victoria Cusco, 1 November 2007, A. Quinones. Cusco, 1 November 2007, A. Quinones. Host: Achiete. Det: G. Tejada, 2007 Host: Achiete. Det: G. Tejada, 2007 Thorax Side Image: Sarah McCaffrey Ventral Image: Sarah McCaffrey Museums Museums Victoria Victoria Results Generated: Friday, October 1, 2021 .