| |
| | Black Flies, HYG-2167-97 |
 | | It is suspected that the expansion of fl fly populations in Ohio is likened to improvement in stream and river water quality in recent years. |
 | | Black flies often occur in enormous numbers in the spring and early summer months, especially in the northern latitudes. |
 | | Black flies are attracted to mammals by the carbon dioxide and moisture in exhaled breath, dark colors, convection currents, perspiration, perfumes, toiletries, etc. |
| ohioline.osu.edu /hyg-fact/2000/2167.html (1481 words) |
|