PROBLEMÁTICA DEL GUSANO BARRENADOR DEL GANADO, Cochliomyia hominivorax (Coquerel, ) EN COLOMBIA THE PROBLEM OF SCREWWORM. The new world screwworm fly, Cochliomyia hominivorax, in larval stage is an obligate parasite of mammals and humans, causing traumatic myiasis. The female. “Comision Mexico-Americana Para la Erradicacion del Gusano Barrenador del Ganado.” Special Collections, USDA National Agricultural Library. Accessed.
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The screwworm is the larva of a fly whose scientific name is Cochliomyia hominivorax Coquerel, This parasite is harmful, in terms of production and mortality for all warm- blooded animals, i. The pathological effects of screwworm fly infestations in the parasitized host can be bafrenador into four main components:.
An infected animal can survive only a few days if the infestation is severe and not treated early. Even with treatment, particularly if delayed, gandao infections can spread through the bloodstream and cause arthritis, enteritis and septicemia.
The excretions of screwworm produce necrosis to the infested tissue, which by its smell attracts other species of Diptera that infest the outside screwworm area while still widening and deepening the wound. Like other insects, screwworm fly has four phases or stages in its life cycle which are: They are blue — bright green metallic colored, their eyes are reddish orange.
In the case of the male they are united holoptical and in the female there is a separation between both eyes dichopticand they are about twice the size of a housefly. Males are sexually active and can copulate several times ganaado the course of their adult lives.
While females mate only once in their lifetime and an oviposit can put between 10 and 1, eggs 3, in some cases into three or four groups of 10 to each.
This oviposition performed in the dry barrenaddor of the wounds of warm-blooded animals looking the hardest part without fluid, usually to one side thereof. It can be anything from a tick bite up to a larger wound, newborn navel cut, dehorning, castration, gando due to wiring, fresh cow vulvas, etc. Adults have an exceptional ability to travel up to kms, in less than two weeks. This translation is done by taking advantage of shades offered by the vegetation.
They are of short duration so they are not usually collected at this stage for identification. They are deposited in masses maggots at the edges of the wounds of warm-blooded animals, usually presenting a placement or array as tiled roofsbeing all oriented in the same direction and joined bardenador by a solid concrete, making their separation difficult.
This order can be altered by the lack of rest or stillness of the host at eel time of posture blows from the tail onto the wound, biting, kicking, scratching with the limbs, wallowing in the grass or dirt, among others. Each little egg has a tough outer shell called corium with reticulated or lace appearance containing an embryo which is completely transformed into first instar of larvae before hatching.
The tape hatching or dorsal suture bxrrenador a weak line along the ovule from the operculum to the opposite end, which opens at the time that the first instar larvae is ready to go, and between hours after posture.
PROBLEMÁTICA DEL GUSANO BARRENADOR DEL GANADO, Cochliomyia hominivorax 
The fitting of worm is caused by the larvae of the fly obligate parasite called Cochliomyia hominivorax. Their injuries are typical, large and deep, with highly unpleasant odorous exudates which become more attractive to gravid females.
In this evolutionary cycle there are three larval instar which last from 4 to 8 days, as detailed as follows:. The infestation begins when the screwworm eggs incubated in the wound of an animal or host and the larva proceeds to feed of the live flesh. It is difficult to see on first sigh in a wound, the presence of screwworm larvae in its first stages of life; only can be observed by very slight movements.
As the larva feeds, the wound gradually enlarges, becoming larger and deeper. In this stage is frequent that the female flies have laid its eggs inside the wound, developing in this way a multiple infestation.
The infected wound often bleeds and releases a very peculiar smell. Can also be that the wounds on the skin look little; however right under these there are large cavities which house larvae that are actively feeding. The animals infested with screwworm may die in a few days if the wounds are not healed. This animal suffers general discomfort; loss of appetite and the females produces less milk. Typically these animals are separated from the rest and seek for isolated areas or with shadows to get laid.
The screwworm has seriously affected the livestock in the American Continent, and specially the cattle. The wounds caused by dehorning, castration, iron marking, ticks bites, and in particular birth are very attractive to the oviposition of the female flies.
The economic losses produced are large, because even when the affected animals not always dies, it susceptibility to others diseases, the meat and milk production decreases and the livestock remains harmed.
In addition, the cost of labor necessary for the inspection and treatment of the cattle and the cost of the proper treatment can be very expensive.
The new world screwworm in Mexico and Central America
The wild animals probably suffer and even worst devastating effects because they are unmanageable and cannot be benefited by the measures of treatment and protection that domestic animals get. Insects with a pair of wings and one pair serving as modified flight stabilizer halteres. To this order belong flies and mosquitoes. Insect with internal wings. The formation of wings begins in the larval phase internally and fully manifested in the adult stage. Flies that produce miasis. Most feed on dead tissue, except hominivorax screw-worm, which feeds on living tissue.