![]() ![]() The rice weevil ( Sitophilus oryzae) is a major pest of rice, maize and other cereals in store. ![]() Grain weevils attack grains either in the field before harvest or in the store. ![]() The adult attacks whole or damaged grains causing irregularly shaped holes. The larva (grub) lives and feeds inside the grain hollowing it out. The adults are small (2.5 to 4.0 mm long), brown weevils with a long, narrow snout. Ⓒ Clemson University - USDA Cooperative Extension Slide Series, United States, ( For more information refer also to datasheet on the larger grain borer (click here) Adults are 2 to 3 mm in length and reddish-brown in colour (shown on wheat grains). Lesser grain borer ( Rhyzopertha dominica). It will be controlled by any method that controls the larger grain borer. The lesser grain borer is primarily a pest of cereal grains, other seeds, cereal products and dried cassava. Pupation usually takes place within the eaten grain. In later stages of infestation these beetles may also hollow out the grains. Both larvae and adult bore through the stored produce usually causing characteristic round tunnels (up to 1 mm diameter). Eggs are laid loose among the cereal grains. The thorax bears rows of teeth on its upper front edge and the head is turned down underneath the thorax so that it cannot be seen from above. This is a tiny beetle (2-3 mm long) with a slim and cylindrical shape and red-brown to black in colour. Lesser grain borer ( Rhizopertha dominica) ⒸCAB International, Wallingford.įor more information refer to datasheet on the larger grain borer (click here) Reproduced from the Crop Protection Compendium, 2004 Edition. Haas icipeĬowpea damaged by cowpea seed beetles and weevils ( Callosobruchus spp.) Ⓒ A. © CAB International, Wallingford, UK, 2005Ĭowpea seed beetle. Reproduced from the Crop Protection Compendium, 2005 Edition. Adults are 2-3 mm long, reddish-brown and cylindrical, head not visible from above. Reproduced from the Crop Protection Compendium, 2005 Edition.Īdult beetle of lesser grain borer ( Rhizopertha dominica), line drawing. They are white when first laid and quickly change to a reddish colour. The eggs are laid singly or in clumps of variable numbers. Ⓒ Clemson University - USDA Cooperative Extension Slide Series, The moth is small, pale brown, 5-7 mm long with wings folded, wingspan 1-1.6 cm. Ⓒ University of Georgia Archives, University of Georgia, Adult emergence holes with irregular edges are apparent some weeks after the initial attack. Ⓒ Courtesy EcoPort ( ): Ministry of agriculture, JapanĪdult beetles of Maize weevil ( Sitophilus zeamais) in maize. The moth is small, pale brown, 5-7 mm long with wings folded, wingspan 1-1.6 cm Ⓒ Clemson University- Storage moth ( Ephestia cautella). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |