WNC Orchard Insect Pest Populations – May 3, 2023

— Written By
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.


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 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 ▲

Rosy apple aphids in apple leafCodling moth is the main pest of concern at this time. With biofix dates of April 1st and 7th in Cleveland and Henderson Counties, respectively, a total of about 145 and 300 degree-days have accumulated thus far. The codling moth egg-hatch model predicts initial egg hatch to occur at 250 DD after biofix. Hence, insecticides may be necessary in lower elevation orchards (about 1,000 ft elevation) at this time. Egg hatch in Henderson County (about 2100 ft elevation) is not expected to begin for another 7 to 10 days.

In orchards using mating disruption, it is unlikely that insecticides will be necessary for first generation codling moth. However, pheromone traps should be used to confirm that supplemental insecticides are not required. Unless there is a cumulative trap capture of >3 moths over a two week period, insecticides are not recommended for codling moth.

If needed, there is still time to apply an insecticide targeting San Jose scale crawlers. First cover is generally the time when crawler emergence begins in earnest, so preventive control should be applied no later than first cover. Esteem, Centaur, Movento and Assail all provide good control, but from a resistance management perspective, avoid using the same material twice in the same year, and if possible rotate materials among years as well.

Rosy apple aphid populations have been fairly high in certain areas this year. RAA populations tend to naturally decline with warmer temperatures, so the cool weather we are experiencing tends to prolong the infestation period of this insect. Before spraying specifically for this insect, unravel curled leaves to confirm the presence of live aphids. There are many insecticides with excellent activity against RAA, including Admire Pro (and generics), Actara, Assail, Beleaf, Closer, Sivanto Prime, and Movento.

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

2023 Average Weekly Trap Captures

Insects per trap
Apr 17 Apr 24 May 1
Codling moth  2.0 8.0 0.5
Oriental fruit moth 67.5 89.5 26.0
Tufted apple bud moth 0.0 19.0 9.0
Redbanded leafroller 4.0 4.0 0.0
Obliquebanded leafroller
Lesser appleworm
Apple maggot (abandoned and research orchards)
Brown marmorated stink bug (commercial)
Brown marmorated stink bug (unsprayed) 0.0 1.5 0.0
Spotted tentiform leafminer 0.0 0.0 0.0
Dogwood borer 0.0 0.0 1.0
Peachtree borer 0.0 0.0 0.0
Lesser peachtree borer 20.0 45.0 7.0
San Jose scale 0.0 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.

2023 Accumulated Degree Days

Apr 17 Apr 24 May 1
Codling moth (Biofix: April 7) 72 130 170
Oriental fruit moth (Biofix: March 24) 285 366 433
Tufted apple bud moth (Biofix: April 21) 80

About degree-day models

2023 Pest Population Trends

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