. Annual report. New York State Museum; Science -- New York (State); Plants -- New York (State); Animals -- New York (State). 26 NliW YORK SIATI': Flight and dissemination. 'Jhis is sonicthiiii^ of great import- ance in view of the part Hies may play in the spread of disease. The experiments of Dr L. O. Howard, Government hjitomologist, have shown conclusively that the major portion of ll:e tiics about a buiUHng breed in the immediate vicinity, jjrohably within 300 to 5CK) feet. There is no denying the fact that this insect is capable of flying considerable distances but ordinarily t
. Annual report. New York State Museum; Science -- New York (State); Plants -- New York (State); Animals -- New York (State). 26 NliW YORK SIATI': Flight and dissemination. 'Jhis is sonicthiiii^ of great import- ance in view of the part Hies may play in the spread of disease. The experiments of Dr L. O. Howard, Government hjitomologist, have shown conclusively that the major portion of ll:e tiics about a buiUHng breed in the immediate vicinity, jjrohably within 300 to 5CK) feet. There is no denying the fact that this insect is capable of flying considerable distances but ordinarily this does not seem to occur. There is another phase of this question which has ap- parently received little consideration, namely, the conveyance of flies l)y vehicles of one kind or another. Only a little observation is necessary to show that the butcher cart of tlie country is a very efficient carrier of flies, presumably receiving accessions and leav- ing individuals at almost every stopjiing place, even though the route traversed may occupy an entire day. The same is true, though to a more limited extent, of trolley cars and express cars carrying sacked meat or other supplie-^ eciually attractive to flies. It is onl_\ necessary for these carriers to load where conditions are favorable for the infection of flies and we may have a mysterious outbreak of disease at some distance from the source of trouble. Natural enemies. The house fly, though so abundant, is subject to attack by various natural enemies. One of the most common is a fungous disease known as E m p u s a m u s c a e which is occasionally responsible for the death of many flies, particularly toward the end of the summer. It is not uncom- mon to find a few individuals affected by this disease every year. A small, reddish mite may be occasionally found attached to flies, seriously weakening the host. There are, in addition, wasps and spiders which prey upon flies and undoubtedly are of considerable service Fig. 12 ?
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Keywords: ., boo, bookauthornewyorkstatemuseum, booksubjectnewyorkstatemuseum
