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Haematobia irritans  is a cosmopolitan obligate blood-feeding ectoparasite of cattle and is the major global pest of livestock production. Currently,  H. irritans  management is largely dependent on broad-spectrum pesticides, which has led to the development of insecticide resistance. Thus, alternative control methods are needed. Essential oils have been studied as an alternative due to their wide spectrum of biological activities against insects. Thus, the main aim of this study was to evaluate the insecticidal, repellent and antifeedant activity of the essential oils from  Blepharocalyx cruckshanksii  leaves and  Pilgerodendron uviferum  heartwood against horn flies in laboratory conditions. The composition of the essential oils was analyzed using gas chromatography coupled to mass spectrometry. Accordingly, α-pinene (36.50%) and limonene (20.50%) were the principal components of the  B. cruckchanksii  essential oil, and δ-cadinol (24.16%), cubenol (22.64%), 15-copaenol (15.46%) and δ-cadinene (10.81%) were the most abundant compounds in the  P. uviferum  essential oil. Mortality of flies and feeding behavior were evaluated by non-choice tests, and olfactory response was evaluated using a Y-tube olfactometer. Both essential oils were toxic to horn flies, with LC 50  values for  B. cruckchanksii  essential oil of 3.58 µL L −1  air at 4 h, and for  P. uviferum  essential oil of 9.41 µL L −1  air and 1.02 µL L −1  air at 1 and 4 h, respectively. Moreover, the essential oils exhibited spatial repellency in the olfactometer using only 10 µg of each oil, and these significantly reduced the horn fly feeding at all doses evaluated. Although further laboratory and field studies related to the insectistatic and insecticide properties of these essential oils against  H. irritans  are necessary,  B. cruckshanksii  leaves and  P. uviferum  heartwood essential oils are promising candidates for horn fly management.

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Insecticidal, Repellent and Antifeedant Activity of Essential Oils from Blepharocalyx cruckshanksii (Hook. &amp; Arn.) Nied. Leaves and Pilgerodendron uviferum (D. Don) Florin Heartwood against Horn Flies, Haematobia irritans (Diptera: Muscidae)