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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Two experiments were conducted in Taiwan to study the potential of mulch for reducing sweet potato weevil infestations. Daily locomotor activity in the Indian sweet potato weevil, Euscepes postfasciatus Fairmaire Coleoptera: Attelabus formicarius Fabricius, Brentus formicarius Fabricius, Cylas turcipennis Boheman, In some cases, nematodes are more effective than insecticides at reducing damage.

Formicidae seem to be most important.

The pupal stage lasts about a week to 10 days. These data show that flooding of fields between two consecutive sweet potato crops may reduce the immediate source of weevils from formicarrius field.

Distribution Cylas formicarius is found throughout the coastal plain of the Southeast from North Carolina to Texas. A record of C. Studies on the utilization of a female sex pheromone for the management of sweetpotato weevil, Cylas formicarius F.

Strains of the fungus Beauveria bassiana that are pathogenic to sweetpotato weevil have been identified, and can be effective is there is adequate soil moisture. The sweet potato weevil. However, in areas where sweet potato is a staple food and is planted year-round, rotation is not always possible.


Heterorhabditidae penetrate the soil and tubers, killing weevil larvae. Generate a print friendly version containing only the sections you need. In Penghu Island, Taiwan, Talekar et al. Sanitation Sanitation practices or clean cultivation, especially for the control of an insect that has limited flying activity, may help protect the crop from insect infestation.

Apionidae in the southern United States: Journal of Economic Entomology, 79 3: American Beetles, Volume II: Isolation is frequently recommended, and it is advisable to locate new fields away from previous crops and distant from sweet potato storage facilities, because both can be a source of new infestations.

Root yields in plots where P.

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.

The mean head capsule widths of the instars are 0.

Cylas formicarius

Recent findings in Taiwan showed that the cuttings cm long taken from fresh terminal growth, even from an infested crop, were rarely infested with weevils, whereas older portions of the stem were. The developing larvae tunnel the vines and tuberous roots resulting in significant damage. Breeding is continuous throughout the winter, especially in potatoes in storage. Traditionally, postharvest treatment has been accomplished with chemical fumigants, but they have fallen from favor.

sweetpotato weevil, Cylas formicarius Coleoptera: Brentidae

Cylas elegantulus Summers Synonym. Diseases and insect pests of Amami Island: Mullen found a single female to lay up to eggs; fecundity varied depending upon the number of matings formicariue crowding. Flight time and flight age in the sweet potato weevil, Cylas formicarius Fabricius Coleoptera: It is also slightly larger, about mm long.


The body, legs, and head are long and thin, giving it an ant-like appearance. Cylas formicarius Fabricius Among various control measures attempted, modification of cultural practices has the greatest potential in combating the sweet potato weevil at very little cost.

Chemical Control Numerous chemical insecticides have been tested for the control of C. Journal of Root Crops This approach is considered in areas where rotation is not possible. The mature larva excavates a cell 2 to 3 times the size of its body in which pupation occurs. The egg is oval in shape and creamy white in color.

Adult feeding on the foliage seldom is of consequence. This weevil -related article is a stub. The usefulness of crop rotation with rice in controlling the weevil was investigated in two experiments, each lasting months in Taiwan Talekar, The chemical control of Cylas formicarius Fab.

Resistance in sweet potatoes to the sweetpotato weevil, Cylas formicarius elegantulus Summers. Infestation of a sweetpotato weevil Coleoptera: W, W, W, W, W, and W sweet potato germplasm with multiple insect and disease resistances. This species is included for comparison to other species that are considered invasive.