Fly Control Using Ear Tags
go.ncsu.edu/readext?605827
en Español / em Português
El inglés es el idioma de control de esta página. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.
Al hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. NC State Extension no garantiza la exactitud del texto traducido. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.
Português
Inglês é o idioma de controle desta página. Na medida que haja algum conflito entre o texto original em Inglês e a tradução, o Inglês prevalece.
Ao clicar no link de tradução, um serviço gratuito de tradução será ativado para converter a página para o Português. Como em qualquer tradução pela internet, a conversão não é sensivel ao contexto e pode não ocorrer a tradução para o significado orginal. O serviço de Extensão da Carolina do Norte (NC State Extension) não garante a exatidão do texto traduzido. Por favor, observe que algumas funções ou serviços podem não funcionar como esperado após a tradução.
English
English is the controlling language of this page. To the extent there is any conflict between the English text and the translation, English controls.
Clicking on the translation link activates a free translation service to convert the page to Spanish. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. NC State Extension does not guarantee the accuracy of the translated text. Please note that some applications and/or services may not function as expected when translated.
Collapse ▲Insecticide-impregnated ear tags or “Fly Tags” are a convenient way to control pasture flies (especially horn fly). Tags are inserted in late spring, or early summer, and your fly control program travels with the animal. However, continued use of tags with the same insecticide for several consecutive seasons can lead to populations of the horn fly that have resistance to a whole class of related insecticides. This will cause a shorter than normal period of fly control, and testing would be needed to confirm resistance.
To further complicate the issue, there are several other things that could cause reduced fly control. Fly Tags have a limited duration of effectiveness. The 12- to 15-week “fly control clock” starts when tags are inserted. Applying them too early in the spring can mean control “runs out” before fly season is over. In addition, Horn flies can move in from untreated nearby herds and keep populations high, making control seem less effective. As well, above average precipitation can keep manure pats moist longer, making them more suitable for horn fly breeding as opposed to hot, dry summers when they dry quicker and are less hospitable for horn fly maggots.
There are several ways producers can get the most out of their ear tag-based fly control program. First, rotate insecticide classes annually. Currently there are three options—organophosphates, pyrethroids, and chlorinated hydrocarbons—but dozens of brand names. Check the label for the name of the active ingredient in the tag to be sure you know what you are using and record the choice each year. Next, always apply tags after horn fly numbers reach about 100 per side per animal. This will prevent applying them too early. It takes more than 100 flies per side to have an impact on weight gain. Lastly, supplement fly tags with dust bags, oilers, sprays or pour-ons, if needed.
Staying on a pro-active program will keep resistance problems at bay, and you will help keep your cattle more comfortable, healthy, and productive during the active fly season.