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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Journal of Economic Entomolology Evaluation of certain new insecticides in the control of the sweet potato weevil, Cylas formicarius Fb.

Availability of sex pheromone will aid considerably in quickly attracting weevils out of ‘weevil-positive’ Ipomoea, and only fornicarius plants will need to be eliminated. They are about 6 mm long.

Plastic film and rice straw mulch reduced weevil infestations as compared with non-mulched plots AVRDC, Steinernematidae and Heterorhabditis bacteriophora Nematoda: Environmental Entomology, 19 6: Other cultural practices which may help reduce weevil damage and which are often advocated are: A more complete and correct list of cylsa plants of C. Queensland Agricultural Journal, 6: Photos of insects and people from the gathering in ArizonaJuly Photos of insects and people from the gathering in Alabama Photos of insects and people from the gathering in Iowa Photos from the Workshop in Grinnell, Iowa Photos from the gathering in Washington.

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Control achieved by post-plant applications appears to be due to mortality formicariuss weevil adults searching for feeding or oviposition sites. Studies directed toward the determination of sex and food attractant of Cylas formicarius elegantulus. Attracted to various light sources. However, because of its limited or almost non-existent flying activity, formicarlus 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 dylas plant, this pest is amenable to suppression by crop rotation, clean cultivation, mulching and similar simple cultural practices.

Journal of Entomological Research, 8 2: Among various control measures attempted, modification of cultural practices has the greatest potential in combating the sweet potato weevil at very little cost. Title Damage symptoms Caption Root damage by larvae of the sweet potato weevil.

Cylas formicarius

In Penghu Island, Taiwan, Talekar et al. Resistance in sweetpotato to sweetpotato weevil. Nonetheless, despite these efforts, not a single sweet potato cultivar has been bred using previously identified sources of resistance, which is grown in any appreciable area to control Cylas species.

Frass is deposited in tunnels. Journal of Economic Entomology, 85 2: We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. The adult is quick to feign death if disturbed.

Under laboratory conditions at 15 C, adults can live over days if provided with food and about 30 days if starved. Life-history, bionomics, and control of sweet potato weevil Cylas formicarius with short notes on some other pests of sweet potato in Bombay State. Rajamma P, Padmaja G, Brentidae in relation to adult age, mating status, and starvation.


Measurement of the economic importance of sweetpotato weevil. Ciencia y Tecnica en la Agricultura, Viandas Tropicales, 10 1: Among the convolvulaceous hosts, the insect overwhelmingly prefers sweet potato Cockerham, Similarly, the African sweet potato weevil [C.

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

Among various control measures formciarius, modification of cultural practices has the greatest potential in combating the sweet potato weevil at very little cost.

Cylas formicarius (sweet potato weevil)

Among the three predators only Pheidole megacephala is reported to be an effective natural control agent of C. Control of alternative hosts Several species of Ipomoea in addition to sweet potato, and a few related convolvulaceous plants are also alternative hosts of C. Adults are ant-like, shiny, blue-black, snout beetles whose “waist” and legs are bright orange-red.

In Uganda, Smit showed that when the formicsrius was harvested all at once, the percentage of damaged roots increased linearly the longer the harvest was delayed. Distribution Top of page A record of C. The colour is white or pale-yellow. Strongly attracted to sex pheromone: