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The Ox Warble Flies

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The Ox Warble Flies BULLETIN 428 NOVEMBER, 1928 The Ox Warble Flies Hypoderma bovis de Geer Hypoderma lineatum de Villers Don C. Mote OHIO AGRICULTURAL EXPERIMENT STATION \Vooster, Ohio CONTENTS Introduction . .. 3 Hosts .............................................................. 4 Effect of the Warble Flies on Man and Animals . .. 5 Economic Importance . .. 8 Distribution . ................................ 10 Biology and Habits . 12 Larvae in the Gullet and Spinal Canal . 19 Emergence of Adults ................................................. 27 Combatting the Warble Flies ......................................... 28 Extracting and Destroying . 28 Larvacides . ............. 31 Fly Repellents, Ovicides . 34 Medicinal Treatment . 35 Natural Immunity ................................................ 35 Protection of Cattle by Housing ................................... 36 H. bovis and H. linea tum Differentiated ................................ 36 The Adult . 37 The Egg ........................................................ 38 The Larvae . 38 The Puparia . 42 Literature Cited .................................................. , . 43 (1) This page intentionally blank. THE OX WARBLE FLIES~· Hypoderma bovis de Geer Hypoderma lineatum de Villers Order, Diptera Family, Oestridae DON C. MOTE INTRODUCTION Domestic cattle in Ohio are subject to attack by two species of warble flies-Hypoderma bovis de Geer and Hypoderma lineatum de Villers. Every cattleman is familiar with grubs that produce the tumors or warbles on the backs of cattle in the spring and nearly everyone is familiar with "gadding" among cattle. Very few, however, connect either the grubs or "gadding" with the adult flies, commonly known as "heel" flies, or warble flies, and much misinformation and even superstition are spread around concern­ ing "gadding" and cattle grubs. The damaging effects of the warble flies' activities upon Ohio's cattle and dairy industry were given publicity by the Ohio Experi­ ment Station in 1914 (46)t. Preliminary observations indicated that the pest was causing serious loss of meat by what is known as "licked" beef, which is useless for human food; loss of condition among beef and dairy animals ; and loss of milk, with consequent reduction in profits. The substantial losses, moreover, in damaged hides for which the warble flies are responsible made it apparent that studies on the life, habits, and control of these :flies should constitute one of the Station's projects in the study of the parasites of domestic animals of Ohio. The studies, of which this paper is a report, were begun in a preliminary way in 1913 and continued until 1918. The inquiry did not yield as much original information as the writer desired, due largely to the limited time for study because of other projects and duties and to the nature of the flies' life history, for the larvae live internally in the cattle for a period of eight or nine months, beginning at various times from late May or early June onward thru the summer, so that study and treatment are rendered exceed­ ingly difficult. *The writer is indebted to Doctor Herbert Osborn and Professor Jas. S liil'le, both of the Ohio State University, for their valuable help and assistance in this work. tNumbers in parentheses refer to Literature cited, page 48. (8) 4 OHIO EXPERIMENT STATION: BULLETIN 428 The writer planned to continue the studies and accordingly delayed publication of the information already obtained until further inquiry should yield more complete data. The opportunity, however, has never presented itself and now it seems that the information obtained should be published, fragmentary as it is. In recent years much valuable information has been obtained on the life, habits, and control of the pest by investigators in the United States, Canada, England, Ireland, Germany, France, Den­ mark, and other countries. The writer will try to incorporate the salient features of these investigations in this publication. Because of inaccessibility, he has not been able to consult as many publications as would be desirable, and any omissions, it is hoped, will be charitably considered. HOSTS The normal host of these two flies is cattle, Bos taurus. The American bison, Bos bison, however, is known to be infested at times with H. lineatum, but bison do not appear to be so heavily infested as are cattle raised under similar conditions in the same regions. Fig. 1.-Blood sucking flies (A, B) often erroneously thought to be the cause of cattle grubs (enlarged 2.2 times). Compare with the ox warble fly, Hypoderma bovis de Geer (C), the cause of the cattle grubs The horse occasionally is infested with Hypoderma larvae. A number of reports of cattle grubs in the backs of horses were received: one from J. Allyn, of Hiram, Ohio; another from Frank Noble, St. Mary's, Ohio; and still another from Mr. Franks, near Wooster, Ohio. Mr. Franks reports that his horse was purchased THE OX WARBLE FLIES 5 in the region of Roscoe Young, who had a horse with several grubs in its back. Mr. Noble made a survey of the township in which he lived and found horses on three farms infested. He writes as follows: "There were three farms that had infested animals. These farms are separated from two to five miles. There was one horse on each farm that was infested and only one that had more than one grub. On one farm there were twelve horses; on one, four; and on the other, only two. On all these farms the cattle were badly infested, and had been in the same pasture with the horses. The grubs are very similar in appearance to the ones in the cattle. I have made a pretty thoro canvass of our township and fail to find any grubs, but should I fi.nd any will send them to you at once." Fig. 2.-Larvae were taken from the backs of different cattle at the positions marked x The part of the animal in which the grubs are found during their last stages is the back. Here they may be found distributed for the most part from the loin to just back of the shoulder. Less frequently they may be found on the rump, or some distance down on the side or on the shoulder. The choice of the back region to go through the last stages has some advantages. Here they are less likely to be injured; there is less play of the muscles, and the animal itself is less likely to receive serious injury. Infestations of humans, especially children, by cattle grubs are not uncommon. The clinical histories of many cases of dermal, or "creeping myiasis", appear in medical literature; but only in a few of these has the specific determination of cattle grubs been made. EFFECTS OF THE WARBLE FLIES ON MAN AND ANIMALS For purposes of discussion the injuries caused by warble flies may be classifi.ed as follows: 1, fright produced by the adult flies during the egg laying period; 2, lesions produced by the migrating larvae; and 3, anaphylaxis or anaphylactic shock. 6 OHIO EXPERIMENT STATION: BULLETIN 428 The degree of injury caused by fright varies with the abund­ ance of the insects and with the species present. H. bovis apparently causes the most excitement to stock and when present produces the greatest damage in this respect. Losses caused by this annoyance include marked reduction in m1lk flow, failure to fatten or put on flesh normally, and mechanical injury due to wild efforts of the animals to escape attacks. The damage from lesions may be divided into five divisions: 1, injury produced by the penetration of the young larvae thru the skin; 2, possible inoculation of disease, like anthrax and blackleg by the larvae in their passage thru the skin ; 3, the inflammation pro­ duced in the gullet and in other internal organs by the migrating larvae; 4, the irritation produced along the spinal cord and on the main branches of the nervous system by the burrowing of the larvae; and 5, lesions produced by the later larval stages in the subdermal tissues of the back, with the accompanying pus forma­ tion. The presence of exudate and pimples on cattle immediately under the eggs of Hypoderma from which the larvae had emerged was first recorded by Carpenter, Hewitt, and Reddin in 1914 (7). Hadwen (21) has rather fully described the skin lesions of Unea­ tum. He proposes the name "hypodermal rash" for the condition resulting from larval penetration and reports that this condition may be mistaken for mange or cowpox (27). Bishopp (2) has observed repeatedly that violent stamping, kicking, and licking of the affected parts by the host occur soon after the hatching of the eggs begins, and a few days later soreness and the formation of scabs caused by exudation and hardening of serum are apparent. When these scabs are removed, a cluster of hatched eggs is usually found attached to the hair in their midst. No experiments have been reported, proving that the larvae may inoculate disease, but Hadwen (27) has shown that in case of reindeer Bot infestations with B. pyocyaneous are common. Little is known concerning the irritation produced by the wanderings of the larvae after they have penetrated the skin. When the larvae reach the gullet, however, they may produce marked inflammation. Des Gayets and Vaney (17) and Jensen (31), who made a special study of the lesions caused by the larvae in the oesophageal wall, met with cases of stenosis of the gullet caused by them. The submucous tissues are edematous, usually yellowish and sometimes bloody in the region of the larvae. Cases are on record in which heavy infestations of the esophagus produced edematous conditions with large swellings (27). THE OX WARBLE FLIES 7 Lesions in the spinal canal are not as easily verified. No signs of inflammation in the chord were noticeable in the neighborhood of the larvae found by the writer. Other investigators, on the other hand, have observed inflammation (22) and instances are recorded in which the larvae, burrowing in the spinal canal, have caused paralysis of the posterior parts.
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