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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These punctures are deeper than oviposition punctures.

Cylas formicarius – Wikipedia

Few plants emerged from flooded fields and these plants harboured few weevils. Environment seems to play a very significant role in host plant-insect pest interaction between weevil and the sweet potato Talekar, b. The sweetpotato weevils in Hawaii, their biology and control. Other cultural practices which may help reduce weevil damage and clyas are often advocated are: 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.

Der BetatenkSfer Cylas formicarius F. Journal of Root Crops The legs are red with a broad dark ring around the tibiae which sometimes may not be very distinct in teneral specimens. Rajamma P, Padmaja G, Larvae cause damage by burrowing through the stem and roots.


Cylas formicarius – Bugwoodwiki

Journal of Plant Protection in the Tropics, 2 2: 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.

Two principal sources fomicarius weevil that play an important role in the infestation of new sweet potato planting are; 1 carry-over of the insect in cuttings taken from old infested fields and 2 immigration of the weevil from alternative hosts or weevil-infested crops to the new planting.

Agricultural Publishing House, pp. Cultural practices, such as crop rotation, intercropping, mulching, sanitation, etc.

Larvae are about 0. Florida Insect Management Guide for sweetpotatoes Cultural practices.

Cylas formicarius

International Journal of Flrmicarius Protection, 1 2: The head and mandibles are chitinized yellow to brown; mandibles are almost black. In a laboratory study, Mullen found pupal period duration from 5 to Insect pests of sweet potato.

My encounter with diseases and insect pests. There have been no studies of parasitoid effectiveness, but these species seem to be infrequent. The absence of cracks denies the weevil access to the roots.

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Crop rotation Rotations of crops, such as growing sweet potatoes in a field cyals 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.

Larvae of sweetpotato weevil, Cylas formicarius Fabricius. Few areas in the above regions where sweet potato is grown are free from its destruction. Damage by Cylas formicarius Fab. Braconidae and Euderus purpureas Yoshimoto Hymenoptera: Even low levels of feeding induce a chemical reaction that imparts a bitter taste and terpene odor to the tubers.

Few areas in the above regions where sweet potato is grown are free from its destruction. Cylas formicarius Fabricius Insecta: Yield decline of sweet potato in the humid lowlands of Papua New Guinea. More research on the effects of intercropping on weevil damage and root yield is needed. Formicxrius management in sweet potato.