New Stink Bug Thresholds in Corn
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.
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 ▲
A recent NC State University graduate student, Arun Babu, has worked to generate new thresholds for stink bugs in corn. His work was supported by the growers of North Carolina through the NC Agricultural Foundation and the Corn Growers Association of North Carolina. Arun visited corn fields across eastern NC and tested how to more efficiently scout for stink bugs. He then applied our existing thresholds to his findings. Based on his findings, scouting should be more accurate and time-efficient.
To use these thresholds, sample at least 100 plants in the field. Sample at different locations in all fields and more plants in larger fields. Stink bugs tend to be more prevalent in field edges. Use this to your advantage by sampling edges first. If stink bugs are absent, they are unlikely to be in the middle of the field. Conversely, if numbers are high in edges, be sure to sample the field middle.
The thresholds in the table below change across the growing season and are specific to certain plant parts for partial plant sampling.
The partial plant sampling no treat column represents the number of stink bugs per 100 plants, and below, where you can be confident not to use an insecticide treatment. If it is clear that you will reach this number before 100 plants are sampled, stop sampling. The partial plant sampling treat column represents the number of stink bugs per 100 plants, and above, where you can be confident you should use an insecticide treatment. If you reach this number before 100 plants are sampled, stop sampling and treat. If you get a number between the partial plant sample no treat and treat numbers, use the partial plant sampling fixed threshold.
The partial plant sampling fixed threshold column can be used as a guide for numbers that fall in between the no treat and treat numbers. Using this threshold, do not treat below this number and treat at, or above, this number. Finally, do not convert these numbers into percentages. Those thresholds are in the next table.
|Area for partial plant sample||Area for partial plant sample||Partial plant sampling no treat (stink bugs per 100 plants)||Partial plant sampling fixed threshold||Partial plant sampling treat (per 100 plants)|
|V1 to V6||Stalk below lowest green leaf||6||9||13|
|V14 to VT||Stalk at one leaf above & below primary ear||9||13||18|
|R1 to R4||Stalk at one leaf above & two leaves below primary ear||35||43||52|
The thresholds in the table below can be used to make treatment decisions and are based on sampling the entire plant. Like the partial plant sampling thresholds above, they change across the growing season.
The no treat column represents the percent infested plants where you can be confident not to use an insecticide treatment. The treat column represents the percent infested plants where you can be confident that you should use an insecticide treatment. The fixed threshold column can be used as a guide to treat when numbers fall between the no treat and treat numbers. Using this threshold, do not treat below this number and treat at, or above, this number.
|Growth stage||No treat (% infested plants)||Fixed threshold (% infested plants)||Treat (% infested plants)|
|V1 to V6||6||8||11|
|V14 to VT||16||21||26|
|R1 to R4||30||36||43|