Photo: USDA, ARS (Public Domain). The infestation can start in the field but most damage occurs in storage. Sitophilus zeamais (maize weevil) datasheet. �|z��V"zB���k^��|��zp��eYJ- 0000073897 00000 n The effect of yellow split-peas (. H�\��j�0E�� 0000006150 00000 n trailer <<094EFC9826E74EF09A67D129B277459D>]/Prev 1071208/XRefStm 1745>> startxref 0 %%EOF 580 0 obj <>stream 0000015156 00000 n The elytra also usually have four pale reddish-brown or orange-brown oval markings. %PDF-1.4 %���� The large emergence holes with irregular edges are characteristic. The maize weevil, Sitophilus zeamais. Krischik V.A., Cuperus G and Galliart D (eds.).1995. The maize weevil is very similar to the rice weevil, Sitophilus oryzae (see Fact Sheet no. CONTROL: Assessment of infestations A variety of trapping techniques are available for measuring stored product beetle infestations. L ��xK�*�� =`t�iU���� �?�A�L�T�Y�K�������� Zl����D�+��&j�!#�ķ*<1��"�7[�FĦ�\�ʙ��]!����e�i�V�&����^P��p�Ո��!���v��ב�0j��Ĩ ��4M,�Z The larvae of the two species are not easy to separate. Eggs, larval and pupal stages are all found within tunnels and chambers bored in the grain and are thus not normally seen. In severe infestations only the grain hull is left along with powdery white frass (insect waste). Egg incubation, oviposition periods, and larval instar development were not differ… BioNET-EAFRINET Regional Coordinator: eafrinet@africaonline.co.ke, Sitophilus zeamais Motschulsky, 1855 - Maize Weevil, Coombs CW, Billings CJ, Porter JE, (1977). http://www.infonet-biovision.org/default/ct/91/pests. The end of the body of the maize weevil is more rounded than that of the LGB, and its mouthparts are 'beak-like' and antennae elbowed. Females release a sex pheromone which attracts males. 0000001933 00000 n Youdeowei A. 0000014484 00000 n Exam-ples of internal feeders include maize weevil, rice weevil, granary weevil, lesser grain borer, bean weevil, Fall Armyworm: Life cycle and damage to Maize The caterpillar will then burrow 2-8 cm into the soil before pupating. Grains which float in water often indicate larval damage. The actual length of the life cycle also depends upon the type and quality of grain being infested: for example, in different varieties of maize, mean development periods of S. zeamais at 27°C and 70% RH have been shown to vary from 31 to 37 days. Gaby S. (1988). Journal of Stored Products Research, 13(2):53-58. 0000066767 00000 n Accessed on 28 Jan 2010. The entire life cycle (egg, larva, and pupa) takes place inside the kernel, and the insect can survive only when whole kernels are present. Rice weevils pretend death by drawing their legs close to body and remaining silent even when disturbed. The maize weevil,Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae), is one of the most destructive pests of stored cereals. The actual length of the life cycle also depends upon the type and quality of grain being infested: for example, in different varieties of maize, mean development periods of S. zeamais at 27°C and 70% RH have been shown to vary from 31 to 37 days. Knowledge of the life history and biology is important to the development of an integrated pest management program. 0000011703 00000 n 0000002525 00000 n 0000036748 00000 n After approximately 8-9 days the adult moth emerges to restart the cycle. Ganesalingam VK, (1977). If the soil is too hard then the caterpillar will cover itself in leaf debris before pupating. 0000030599 00000 n H�\��n�0�=O�e�� ���HQ�&�HY̏&3��Ӊ4!��������M��c���\�����x5�������}7���cl�y��Ǿ����u��i?e���]����b�0��t�ro��;��Ǣ�>vq��51����a��q߿�bQ���,6�,b��w�i8����ُŢ��U�e�uʶ��Ȗ�-�cv�¬Ȟ�Fֻs´���&m����. h�bb�c`b``Ń3� ���ţ�1C ;�0 endstream endobj 541 0 obj <>/Metadata 70 0 R/Pages 67 0 R/StructTreeRoot 72 0 R/Type/Catalog/ViewerPreferences<>>> endobj 542 0 obj <>/Font<>/ProcSet[/PDF/Text]>>/Rotate 0/StructParents 2/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 543 0 obj <> endobj 544 0 obj <>stream }���� ��7��5�~��|9�����zy^K�������XE��` 57�� endstream endobj 545 0 obj <> endobj 546 0 obj <> endobj 547 0 obj <> endobj 548 0 obj <> endobj 549 0 obj <>stream 0000001116 00000 n 0000047761 00000 n A very destructive weevil, with the adults attacking sound grain, and the adults and the larvae feeding inside them, leaving large cavities and emergence holes. It is possible to confuse the maize weevil with other storage insect pests such as the larger grain borer – LGB (Prostephanus truncatus). (1996). This activity was undertaken as part of the BioNET-EAFRINET UVIMA Project (Taxonomy for Development in East Africa). ©Georg Goergen (source CABI CPC), The maize weevil, Sitophilus zeamais adult. Egg: Rice weevil lays its eggs in crevices of kernels or dust. 0000011817 00000 n Margraf Publishers Scientific books, Germany. While [15] recorded the mean developmental period of S. zeamais ranging between 33 and 35 days at the mean temperature of 26 ± 2oC, [7] recorded the total developmental period of S. zeamais as 39 Because larval stages feed on the internal parts of the grain, it is difficult to detect infestations early. protectants against the Maize weevil, Sitophilus zeamais which is an important species amongst the most destructive insect pests in the storage of Maize grains, the present experiment was conducted. The maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae), is one of the most destructive pests of stored cereals. The maize weevil can develop on a range of cereal crops. Each female may lay up to 150 eggs in her lifetime. 4��y��F�E���-��Py[7rY�� -")W�}l^>l�%7-����`�O���M�i�wW{B��7�U#�v��Q��+�kT%W��t�w��J�q]}��Y�쫙_�2 ��i@�� ���Ť���a„a�P'4�A��l ���@ ��ށ0�Q��. Both adults and larvaefeed on internally on maize grains and an infestation can start in the field (when the cob is still on the plant) but most damage occurs in storage. A complex of weevils, the rice (Sitophilus oryza), granary (Sitophilus granarius), and maize (Sitophilus zeamais) weevils, are among the most destructive pests of grains, seeds, and grain products stored in elevators and bins.They probably are not native to North America, but entered in seeds carried by settlers through ports. 0000010316 00000 n Ceylon. 0000003682 00000 n Investigation was carried out on developmental biology ofS. It is a pest of stored maize, dried cassava, yam, common sorghum and wheat. ©Gary Alpert, Harvard University, Bugwood.org, Maize damaged by Sitophilus zeamais. www.cabi.org/cpc. Life Cycle of Rice weevil. A single generation can be completed in 28 days. Adult maize weevils are 3 – 3.5 mm long, dark brown – black in colour and shiny and pitted with numerous punctures. 540 0 obj <> endobj xref 540 41 0000000016 00000 n J. of Life Sciences, Vol. 0000011026 00000 n It is a serious pest of stored maize, dried cassava roots, yam, common sorghum and wheat in the East African Region. 0000012520 00000 n The maize weevil is found in all warm and tropical parts of the world. Both adults and larvae feed on internally on maize grains and an infestation can start in the field (when the cob is still on the plant) but most damage occurs in storage. (1993) Pest and vector management in the tropics, Longman group Ltd. England, 399pp. 5(1) March, 2017 11 with a contribution of about 12% of annual production (Wani et al., 2011; USDA, 2015). Life cycle and biology of the rice weevil S. oryzae on rice grain local variety Sampa mashuri was observed under laboratory condition covering thr ee consecutive months (June-August) of 2013. Coombs CW, Billings CJ, Porter JE, (1977). 0000005396 00000 n 0000007554 00000 n The maize weevil has the characteristic rostrum (snout or beak) and elbowed antennae of the family Curculionidae (weevil family). 328). DeTecTion: Wallingford, UK. 204 pp. DeTecTion: Life Cycle. Similar species: Sitophilus zeamais – maize weevil, and Sitophilus granarius – granary weevil. 0000004659 00000 n Sorghum is the third most important crop after teff and maize … 0000004094 00000 n

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