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20 results on '"Friesen, Kristina"'

1. Better than DEET Repellent Compounds Derived from Coconut Oil

Author

Zhu, Junwei J., Cermak, Steven C., Kenar, James A., Brewer, Gary, Haynes, Kenneth F., Boxler, Dave, Baker, Paul D., Wang, Desen, Wang, Changlu, Li, Andrew Y., Xue, Rui-de, Shen, Yuan, Wang, Fei, Agramonte, Natasha M., Bernier, Ulrich R., de Oliveira Filho, Jaires G., Borges, Ligia M. F., Friesen, Kristina, and Taylor, David B.

Published
2018
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8. Occurrence of Escherichia coliO157:H7 in Pest Flies Captured in Leafy Greens Plots Grown Near a Beef Cattle Feedlot

Author

Berry, Elaine D., Wells, James E., Durso, Lisa M., Friesen, Kristina M., Bono, James L., and Suslow, Trevor V.

Abstract

Leafy greens are leading vehicles for Escherichia coliO157:H7 foodborne illness. Pest flies can harbor this pathogen and may disseminate it to produce. We determined the occurrence of E. coliO157:H7–positive flies in leafy greens planted up to 180 m from a cattle feedlot and assessed their relative risk to transmit this pathogen to leafy greens. The primary fly groups captured on sticky traps at the feedlot and leafy greens plots included house flies (Musca domesticaL.), face flies (Musca autumnalisL.), stable flies (Stomoxys calcitransL.), flesh flies (family Sarcophagidae), and blow flies (family Calliphoridae). E. coliO157:H7 carriage rates of house, face, flesh, and blow flies were similar (P> 0.05), ranging from 22.3 to 29.0 flies per 1,000 flies. In contrast, the carriage rate of stable flies was lower at 1.1 flies per 1,000 flies (P< 0.05). Differences in carriage rates are likely due to the uses of fresh bovine feces and manure by these different pest fly groups. E. coliO157:H7 carriage rates of total flies did not differ (P> 0.05) by distance (ranging from 0 to 180 m) from the feedlot. Most fly isolates were the same predominant pulsed-field gel electrophoresis types found in feedlot surface manure and leafy greens, suggesting a possible role for flies in transmitting E. coliO157:H7 to the leafy greens. However, further research is needed to clarify this role and to determine set-back distances between cattle production facilities and produce crops that will reduce the risk for pathogen contamination by challenging mechanisms like flies.

Published
2019
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11. Visual and olfactory enhancement of stable fly trapping

Author

Zhu, Junwei J., Zhang, Qing-he, Taylor, David B., Friesen, Kristina A., Zhu, Junwei J., Zhang, Qing-he, Taylor, David B., and Friesen, Kristina A.

Abstract

BACKGROUND: Stable flies are considered to be one of the major blood-feeding pests in the US livestock industry, causing losses running into billions of dollars annually. Adult stable flies are highly attracted to Alsynite traps; however, Alsynite is becoming increasingly difficult to obtain and is expensive. RESULTS: Here, we report on the development of a less expensive and more efficacious trap based upon a white panel with the option to add visual and olfactory stimuli for enhanced stable fly trapping. White panel traps caught twice as many stable flies than Alsynite traps. Baiting the traps with synthetic manure volatiles increased catches 2–3-fold. Electroretinographic recordings of stable flies showed strong peaks of visual sensitivities occurring at 330–360 nm, 460–525 nm and 605–635 nm. A laboratory study indicated that young stable flies are more responsive to white,whereas gravid females prefer blue; in the field, white traps caught more stable flies than patterned or blue-black traps. CONCLUSION: Stable fly control can be enhanced by developing more efficient trapping systems with added visual and olfactory stimuli.

Published
2015

14. Reproductive Potential of Stable Flies (Diptera: Muscidae) Fed Cattle, Chicken, or Horse Blood

Author

Friesen, Kristina M., Johnson, Gregory D., Friesen, Kristina M., and Johnson, Gregory D.

Abstract

Reproductive potential was assessed for stable fly cohorts fed cattle, chicken, or horse blood. Flies provided chicken blood oviposited20%moreeggs per day than did those fed cattle or horse blood. However, flies provided cattle or horse blood were fecund 50% longer. When both egg viability and number of eggs produced were considered, lifetime reproductive potential was almost twice as high for flies fed cattle or chicken blood than for flies fed horse blood. Maternal investment, which took egg production and volume into account, was higher in cohorts fed cattle blood (70 mm3) when compared with the other treatments (chicken = 54 mm3, horse = 55 mm3). This is the first report of stable flies producing viable eggs after feeding on bird blood. Results from this study in addition to field observations indicate that stable fly interactions with birds may be limited to relatively low risk scenarios.

Published
2012

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