WNC Orchard Insect Pest Populations – August 25, 2021

— Written By and last updated by
en Español / em Português
Español

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 ▲

Brown marmorated stink bug damage on appleFirst generation adults of the brown marmorated stink bug (BMSB) continue to emerge in all production areas. As shown in the figure below, approximately 80% of adults have emerged in Cleveland County as of 25 August, compared to about 50% in Wilkes County and 40% in Henderson County. As emergence progresses we continue to see pheromone trap captures increase in most areas. With warm weather predicted for the foreseeable future, average trap captures across the region increased from an average of about 5 per trap last week to 12 this week. Expect BMSB pressure to remain intense through September.

Chart showing brown marmorated stink bug emergence

Other Pests: The first Apple Maggot flies on traps at our abandoned site were finally captured during the past week. This is quite late, and only four were detected. Based on the Codling Moth degree-day model, second generation egg laying is nearly complete in Henderson County (2390 DD), while in Cleveland County third generation egg laying is about 23% complete (3035 DD). However, populations are very low and do not pose a threat in the majority of orchards. Oriental Fruit Moth populations are also low in managed orchards, and insecticides applied for stink bugs have contributed to suppression of this pest.


Learn more about southeastern apple insect pests at the Apple Insect Management page.


2021 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Aug 9 Aug 16 Aug 23
Codling moth  0.5 0.5 0.5
Oriental fruit moth 20.0 17.5 20.0
Tufted apple bud moth 0.0 0.0 0.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 2.0 1.0 0.0
Lesser appleworm 0.0 0.0 0.0
Apple maggot (abandoned and research orchards) 0.7 0.7 1.3
Brown marmorated stink bug (commercial) 7.5 6.5 12.5
Brown marmorated stink bug (unsprayed) 3.9 4.5 12.1
Spotted tentiform leafminer 0.0 10.0 0.0
Dogwood borer 25.0 33.0 17.0
Peachtree borer 15.0 9.0 20.0
Lesser peachtree borer 15.0 24.0 45.0
San Jose scale 2.5 0.0 0.0

*Note that these averages illustrate only the timing of insect emergence and fluctuations in populations, and are not representative of population levels in any given orchard. The only way to have an accurate assessment of an individual orchard’s populations is to set up traps in that orchard.


2021 Accumulated Degree Days

HENDERSON COUNTY
Aug 9 Aug 16 Aug 23
Codling moth (Biofix: April 10)
2000 2175 2342
Oriental fruit moth (Biofix: March 27)
2668 2879 3081
Tufted apple bud moth (Biofix: April 30)
2309 2520 2722

About degree-day models


2021 Pest Trends (click to enlarge)

Chart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trendsChart showing insect population trends


Visit WNC Orchard Insect Populations for archived posts.


Additional Resources