Some Bionomical Aspects of Horn Fly 1 Populations in Central Texas 2

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Abstract
At Camp Stanley, Bexar County, Texas, Haematobia irritans (L.) ovipositing on cattle manure during October and November were responsible for the spring buildup of flies on cattle during April and May. The average 0.14 flies per pat that emerged from the subsequent overwintering pupae produced an F l generation that averaged 1.2 flies per pat, an 8-fold increase from the overwintering flies to the F l generation. The average monthly rate of production for the period May–October was 6.6 horn flies per pat when competition from other orthropods was allowed, compared with 66.8 per pat when competition was essentially eliminated.

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