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Larvae of sweetpotato weevil, Cylas formicarius (Fabricius). Figure 1. Larvae of sweetpotato weevil, Cylas formicarius (Fabricius). Photograph by James Castner . Brief summary. No one has contributed a brief summary to this page yet. Explore what EOL knows about Cylas formicarius. Add a brief summary to this page. C. formicarius adults feed on the epidermis of vines, scraping oval patches off young vines and petioles. Adults also feed on external surfaces of storage roots.

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Host-Plant Resistance During the past 50 years, numerous attempts have been made to find formicariu of resistance mainly to Cylas species and to incorporate the resistance in agronomic cultivars. However, because of its limited or almost non-existent flying activity, which implies that the insect is carried from place to place via movement of the plant material, host specificity to the genus Ipomoea, and characteristic mode of entry and damage to the plant, this pest is amenable to suppression by crop rotation, clean cultivation, mulching and similar simple cultural practices.

This is presumed to be due to the absence of soil cracks due to adequate soil moisture in the wet season as opposed to the dry season. However, because they are active mostly at night, their dispersive abilities are probably underestimated.

sweet potato weevil (Cylas formicarius)

Insect Science and its Application, 8 Railroad vine, Ipomoea pes-capraeand morning glory, Ipomoea pandurateaare among the suitable wild hosts. Upcoming Events Discussioninsects and people from the BugGuide Gathering in VirginiaJuly Photos of formicariis and people from the gathering in WisconsinJuly Photos of insects and people from the gathering in VirginiaJune Journal of Entomological Science Efectividad tecnico – economico del empleode la hormiga leona Pheidole megacephala en el control del tetuan de boniato Cylas formicarius elegantulus.

Dedicated naturalists volunteer their time and resources here to provide this service. Adults are secretive, often feeding on the lower surface of formicwrius, and are not readily noticed. Few areas in the above regions where sweet potato is grown are free from its destruction. Monitoring sweetpotato weevil Coleoptera: Unpublished discussion paper Insect Pests of Burma.


Therefore, the use of weevil-free sweet potato cuttings is often advised Ballou, ; Franssen, ; Tucker, ; Holdaway, Flooding of infested fields was tested in Taiwan to induce rotting of the left-over plant materials and thereby reduce weevil densities from one planting to the next Talekar, The generations are indistinct, and the number of generations occurring annually is estimated to be five in Texas, and at least eight in Louisiana.

There can be as many as eight generations per year. In Uganda, Smit showed that when the crop was harvested all at once, the percentage of damaged roots increased linearly the longer the harvest was delayed. The slips or cutting used to plant the crop should be free of weevils.

The pupa is similar to the adult for,icarius appearance, although the head and elytra are bent ventrally. Privacy policy About Bugwoodwiki Disclaimers. Annual Progress ReportTrivandrum, India: Observations on the biology of Cylas formicarius Fabricius at Coimbatore. Biology and bionomics of sweet potato weevil Cylas formicarius Fabr. Influence of sweetpotato weevil infestation on the yields of twelve sweet potato lines. Life Cycle Adults are ant-like, shiny, blue-black, snout beetles whose “waist” and legs are bright orange-red.

Those hatching in the stem usually burrow down formiicarius the tuber. Sweetpotato Weevil, Cylas formicarius Fabricius Coleoptera: Calystegia sepium great bindweed.

sweetpotato weevil – Cylas formicarius (Fabricius)

Few areas in the above regions where sweet potato is grown are free from its destruction. Government of Saint Lucia, Duration of each instar is 8 to 16, 12 to 21, and 35 to 56 days, respectively.

Environment seems to play a very significant role in host plant-insect pest interaction between weevil and the sweet potato Talekar, b.


The two predatory ants, P. Prevention of soil cracking by hilling the area around the plant or irrigating frequently, are also suggested as an important method of reducing weevil damage Franssen, ; Holdaway, ; Sherman and Tamashiro, Title Adult Caption Cylas formicarius sweet potato weevil ; adult, dorsal view. Efforts to find resistant cultivars have been thwarted by the differences in weevil infestation among trials, locations, seasons, and at times among replicates of a single accession in a trial, among plants in the same plot, and even among storage roots within one plant Talekar,a.

Generate a print friendly version containing only the sections you need. Journal of Invertebrate Pathology, 52 1: Sweetpotato weevil was first noted in the United States in Louisiana inand then in Florida in and Texas inprobably entering by way of Cuba.

Although it has been found associated with several genera, its primary hosts are in the genus Ipomoea. Description Top of page Adults The adult insect is ant-like. Initially the pupa is white, but with time this stage becomes grayish in color with darker eyes and legs.

Cylas formicarius

Crop rotation Rotations of crops, such as growing sweet potatoes in a field only once every 5 years TAC,avoiding planting of sweet potatoes in the same area for two successive years Ballou, ; Chittenden, ; Edwards, ; Holdaway, or planting rice between two sweet potato crops Franssen, have long been suggested.

Sweetpotato weevil, Cylas formicarius elegantulus Summers: Use of sex pheromone trap for monitoring and management of sweet potato weevil Cylas formicarius, Fabricius. The sweetpotato weevils in Hawaii, their biology and control. Sherman M, Mitchell W, The distribution in this summary table is based on all the information available.