Farm & Ranch Stress Assistance Network (FRSAN).Farmer Support Networks Show Farmer Support Networks submenu.Dairy, Livestock & Forage Crops Show Dairy, Livestock & Forage Crops submenu.Labor & Financial Recordkeeping & Analysis.Agricultural Business Management Show Agricultural Business Management submenu.Agriculture & Gardens Show Agriculture & Gardens submenu.(white-footed or deer mouse) caught by his cat that had 16 bot fly larvae!Ĭompared to native host species (like white-footed mouse), non-native hosts (Norway rat, black rat, house mouse, etc.) suffer more serious consequences from bot fly parasitization, and can die. In late August, I have found white footed mice with live larvae, and a colleague gave me a photo of a Peromyscus sp. The head end is narrow, while the rear end is broad and blunt. In humans and dogs the wound is large, sore and inflamed.įully grown larvae are 16-20mm (almost 1 inch) long, dark brown and covered with short, stiff cone-shaped bristles. Once the larva has completed its growth, it exits the host to pupate, and the wound heals over. As the larva grows, a boil-like swelling (called a warble) develops in the host. In the photo of the mouse, the larva is the dark brown spiny protrusion, and the spiracles are brown dots inside a lighter circular tan area. The rear end of the larva and its spiracles (openings to its breathing system) project from the opening. It cuts a breathing opening through the skin and develops at that site for about 21 days. It migrates through the body for about five days, ending up in tissues just below the skin, in the rear ventral region. fontinella enters white-footed mouse through mucous-lined openings like mouth, eye, nose or anus. Then the tiny larva climbs aboard the animal and crawls through the fur, looking for a body opening to enter. A warm body coming in contact with the egg triggers the egg to hatch within a few seconds. About one week after laying, the eggs are ready to hatch, but they must wait for a sudden increase in temperature to trigger that hatching. Odor may be a cue to help the female flies locate such spots. The female flies lay eggs singly on vegetation or substrate that is frequented by small mammals (especially rodent runs and near nests). Larvae (probably this species) have been found parasitizing dogs and humans in New Hampshire. Other reports (species not determined) are from voles and chipmunks. It has also been reared from house mouse, Norway rat and roof rat. White-footed mouse is the most common host for C. 63% of the southeastern NH specimens in the UNH insect collection were found during August, as was the adult in my photograph. In the Durham area, most of the adults are found from June through September. They are black with pale yellow markings and smoky wings. fontinella are large, robust flies, with large eyes, and bodies 15 to 17mm long (roughly 5/8 inch). Our most common bot fly is Cuterebra fontinella, reported to occur in most of the continental US (except Alaska), plus southern Canada and Northeastern Mexico.Īdults of C. We have three species of them in New Hampshire. Bot flies comprise the family Cuterebridae, and are parasites that attack mammals.
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