Should You Stop Treating Cotton for Insects?
go.ncsu.edu/readext?817501
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 ▲Should I treat this cotton for bollworm eggs, plant bugs or stink bugs? This is not a one-size fits all answer, but here are a few scenarios to consider.
1) Delayed cotton with low yield potential
The good news is that this cotton is likely insect-safe. We consider bolls to be safe from plant bug and stink bug feeding once they hit 5 nodes above white flower (NAWF) + 250 cotton growing degree days (GDD) and bolls to be safe from bollworms once they hit 5 NAWF + 350 GDD. Jeff Gore at MS State recently shared some data that 5 NAWF + 250 GDD was equal to about 2-3 NAWF in their environment. That means a lot of this cotton that’s blooming out the top isn’t susceptible to these pests.
2) Delayed cotton with high yield potential
It’s important to check out the boll load in this situation. Keep in mind that August 25th was the last effective bloom date. That means on average there is a 50% chance that lint from today’s bloom will make it into the picker. I wouldn’t worry about losing squares from plant bugs at this point. If there are bolls smaller than the diameter of your thumb, then it will be important to protect these from plant bugs and stink bugs. Plant bugs prefer smaller bolls in this category and stink bugs prefer larger bolls in this category. Both can cause injury to the boll through seed feeding and by transmitting pathogens causing boll rot.
3) Cotton with bollworm eggs
We are now entering the fourth generation of bollworms produced right here in North Carolina. With every generation, there are usually more and more in the system. So that means that some folks are noticing really heavy flights and some significant egg lay in cotton. Fortunately, while these eggs may hatch, the larvae rarely get past the first or second instar stage. It’s always good to keep an eye on your cotton if it’s still bollworm-susceptible for those once in a blue moon scenarios. However, I don’t think we need to roll out with more egg threshold sprays at this point in the season.