scholarly journals Evaluation of Insecticide Ear Tags on Horn Flies in West Central Nebraska, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 364-364
Author(s):  
D. J. Boxler ◽  
J. B. Campbell
Keyword(s):  
Beef Cattle ◽  
Central Research ◽  
Native Range ◽  
The West ◽  
Treatment Groups ◽  
Horn Fly ◽  
West Central ◽  
Horn Flies ◽  
Fly Control ◽  
Extension Center

Abstract Y-Tex experimental ear tags (YT-615) were compared with PYthon® 10% ear tags for horn fly control on beef cattle. The study was initiated 17 Jun at the West Central Research and Extension Center, North Platte, NE. Cattle used in the trial were randomly selected from a herd of 200 heifers. Ear tags were applied as follows: YT-615 applied to 25 heifers (one tag per heifer), PYthon applied to 30 heifers (two tags per heifer) and PYthon applied to 120 heifers (one tag per heifer). An untreated group of 10 heifers served as a comparison. The three treatment groups were maintained in separate native range pastures throughout the study period. Horn fly counts were recorded at weekly intervals by counting flies on both sides of a minimum of 15 heifers during each fly counting session.

Evaluation of Ivomec Pour-On for the Control of Horn Flies in West Central Nebraska, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 363-363
Author(s):  
D. J. Boxler ◽  
J. B. Campbell
Keyword(s):  
Untreated Control ◽  
Native Range ◽  
Horn Fly ◽  
West Central ◽  
Horn Flies ◽  
Fly Control

Abstract Ivomec® pour-on was evaluated in two studies at two different locations in West Central Nebraska. In study No. 1, Ivomec was applied to 72 yearling steers located at the Gudmundsen Sandhills Laboratory, Whitman, NE. The steers were weighed and the Ivomec was applied at the recommended rate. A second application was made 28 d later, 7 Jul. A group of 44 cows served as an untreated control. In study No. 2, Ivomec pour-on was compared to 1% Co-Ral dust bags (force-use, to obtain water) for horn fly control. This study was located near North Platte, NE, in native range. Ivomec was first applied to 41 heifers 27 May at the recommended rate and subsequent applications were made about every 28 d until the end of the study. Treatment dates were 27 May, 30 June, and 4 Aug. Eighty heifers utilized the 1% Co-Ral dust bags and a group of 10 cows served as an untreated control. Horn fly counts for both studies were recorded at weekly intervals by counting the total number of horn flies on both sides on an animal.

PSI-2 Spices in Free-choice Mineral Offer Gain Advantages to Cattle on Tallgrass Native Range and Promise as Fly Control

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 224-225
Author(s):  
Macie E Reeb ◽  
Jaymelynn K Farney
Keyword(s):  
Free Choice ◽  
Control Method ◽  
Cost Effective ◽  
Native Range ◽  
Cost Effective Method ◽  
Grazing Period ◽  
Horn Flies ◽  
Fly Control ◽  
Treatment Structure ◽  
Mineral Type

Abstract This study aims to evaluate effectiveness of two operational management systems for steer gains and fly control. The first strategy evaluated was pasture burn date of March (MAR) or April (APR). The second management strategy was fly control through feeding free-choice mineral with spices (SPICE) or without spices (CON). Eight pastures (n = 281 steers; initial weight 277.7 ± 25.2 kg) were used in a 2 x 2 factorial treatment structure. Steers were weighed individually, randomly assigned to treatment, and grazed for 85 days. Weekly 33% of steers per pasture were photographed and fly numbers counted. ADG was impacted by both burn date and mineral type (P = 0.01). Cattle on the APR-SPICE treatment had a greater ADG than MAR-SPICE and APR-CON with MAR-CON intermediate. Cattle on SPICE gained 4.5 kg (P = 0.12) more than cattle consuming CON mineral. Flies per steer were impacted by burn x mineral x week (P < 0.001). In general, APR-SPICE steers had a greater number of flies weeks 8, 10, and 11 (P < 0.05), corresponding to a time when mineral intake averaged 72% of the formulated intake. The MAR-SPICE steers consumed on average the formulated amount of mineral and through the entire grazing period had lower number of flies than APR-SPICE steers (P < 0.05). The second largest ADG observed with the MAR-CON treatment may be attributed to lower fly numbers as this treatment had one extra week below economic threshold for horn flies. These results are somewhat inconclusive on pasture burn date, but show that the addition of spices to a free-choice complete mineral shows promise as a cost-effective method to increase gains in stocker steers on tallgrass native range. As a fly control method, the spices utilized in this study may be effective if intake is at formulated level.

scholarly journals Control of Western Corn Rootworm Larvae in West Central Nebraska, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 178-178
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Central Research ◽  
Silt Loam ◽  
West Central ◽  
The University ◽  
Extension Center

Abstract Insecticides were applied to suppress larval rootworm populations in 2 fields in west central NE. Both fields located at the University of Nebraska West Central Research and Extension Center were composed of Cozad silt loam soils.

scholarly journals Penstemon: A Summary of Interspecific Crosses

HortScience ◽  
2007 ◽  
Vol 42 (3) ◽  
pp. 494-498 ◽  
Author(s):  
Dale T. Lindgren ◽  
Daniel M. Schaaf
Keyword(s):  
Plant Breeding ◽  
Seed Production ◽  
Interspecific Crosses ◽  
Central Research ◽  
Parent Species ◽  
West Central ◽  
University Of Nebraska Lincoln ◽  
The University ◽  
Extension Center ◽  
Insight Into

Documenting the successful interspecific crosses in a genus is a valuable tool in making decisions in developing strategies for plant breeding activities. However, summarizing the breeding and hybridization can be confusing because of incomplete or lost breeding records and the failure to register the parentage of new cultivar names. A summary of interspecific crosses in the genus Penstemon at the University of Nebraska–Lincoln West Central Research and Extension Center over 10 years provides insight into both successful and unsuccessful crosses. The results, based on seed production and percent of successful crosses, would suggest that interspecific crosses are more likely to be successful when the parent species are more closely related.

scholarly journals Efficacy of Insecticide Ear Tags on Cattle in Central Kentucky, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 397-397
Author(s):  
J. D. Webb ◽  
F. W. Knapp
Keyword(s):  
Beef Cattle ◽  
Horn Fly ◽  
Cattle Herds ◽  
Horn Flies

Abstract Tests were conducted on 5 beef cattle herds in central Kentucky using insecticide ear tags against horn flies and face flies. Ear tags were applied 1/ear in all tests during a 5-day period starting 10 Jun 1995. All tags were applied 1 per ear on all adults and weaned animals in each group. Using binoculars, horn fly estimates were taken on one side of 10 animals while face flies were counted on the head and face of the same animals at weekly intervals.

DUNG BURIAL ACTIVITY AND FLY CONTROL POTENTIAL OF ONTHOPHAGUS NUCHICORNIS (COLEOPTERA: SCARABAEINAE) IN BRITISH COLUMBIA

1975 ◽  
Vol 107 (11) ◽  
pp. 1215-1220 ◽  
Author(s):  
Angus Macqueen ◽  
Bryan P. Beirne
Keyword(s):  
British Columbia ◽  
Harmful Effect ◽  
Dung Beetle ◽  
Cattle Dung ◽  
Control Potential ◽  
Horn Fly ◽  
Fly Larvae ◽  
Horn Flies ◽  
Fly Control ◽  
Burial Efficiency

AbstractOnthophagus nuchicornis (Linnaeus), an accidentally introduced dung beetle, is the only scarabaeine species encountered commonly in cattle dung in British Columbia. Its dung burial efficiency and its potential for inhibiting development of coprophagous fly larvae were measured in greenhouse experiments.The beetles buried dung most efficiently when they were present in the ratio of one pair per 40–50 g of feces. Higher or lower rates of infestation resulted in reduced burial Survival of fly larvae was inversely related to the numbers of brood balls constructed by the beetles, and hence to the amount of dung buried. Beetle activity in the field probably has little harmful effect on the dung-breeding horn fly as the beetles cease burial activity before midsummer, when horn flies reach their greatest numbers, and as they do not bury significant amounts of dung in pastures.The desirability and possibility of introducing exotic dung beetles into British Columbia for fly control is discussed.

scholarly journals Susceptibility of field populations of Haematobia irritans to fipronil in Uruguay

2021 ◽  
Vol 41 ◽  
Author(s):  
Cecilia Miraballes ◽  
Antonio Thadeu M. Barros ◽  
Martin Lucas ◽  
Guilherme M. Klafke ◽  
Luísa N. Domingues ◽  
...  
Keyword(s):  
Research Laboratory ◽  
Probit Analysis ◽  
Rhipicephalus Microplus ◽  
Susceptible Strain ◽  
Single Population ◽  
Haematobia Irritans ◽  
Horn Fly ◽  
Horn Flies ◽  
Fly Control

ABSTRACT: Fipronil was registered in Uruguay in 1997, and, since then, it has been used for the control of Haematobia irritans irritans and Rhipicephalus microplus. The susceptibility of H. irritants to this drug has not been evaluated. Therefore, the goal of the present study was to evaluate the resistance of H. irritans to fipronil. Additionally, a survey was carried out with the farmers to evaluate the use of fipronil for H. irritans control in the ranches where the flies came from. For the bioassays, 31 field populations of H. irritans were exposed to 10 concentrations of fipronil (3.2-16.0μg.cm2), and their LC50 values were calculated using probit analysis. A bioassay was performed with horn flies from the susceptible colony maintained at the USDA-ARS Knipling-Bushland U.S. Livestock Insects Research Laboratory for comparison and calculation of resistance ratios (RRs). All 31 field populations surveyed in the study were susceptible to fipronil, with resistance ratios ranging from <0.5 to 2.2. Four populations with RRs >1 did not differ significantly from the susceptible strain. A single population showed an RR >2.2. Overall, the survey shows that fipronil was mostly used for R. microplus control, and in only three ranches, which were free of R. microplus, was fipronil used for horn fly control. Seventeen farmers did not use fipronil at all in the last three years. It is concluded that, in Uruguay, field populations of horn flies remain susceptible to fipronil.

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