WNC Orchard Insect Pest Populations – June 30, 2020

— 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 ▲

ApplesThroughout most of the higher elevation orchards (≥2000 ft), we are still in that period of the low potential for insect damage. Codling moth degree-day accumulations are only at about 940 as of June 30, indicating first generation flight is the complete and second-generation flight is still a few weeks off. Also, OFM populations remain low in most orchards. The most common insects are secondary pests such as aphids, leafhoppers, and mites, all of which can be managed with curative insecticide/miticide applications. Monitoring for these pests over the next few weeks should be conducted to determine the need for insecticides.

In lower elevation orchards, such as Lincoln and Cleveland Counties and other locations ≤1000 ft, second-generation codling moth flight is just beginning. Cumulative codling moth DDs in this area is about 1400 DD, and insecticides are recommended at about 1450 DD when populations are of moderate to high density. Where populations are low – no damage by the first generation and low pheromone trap capture (no more than 1 or 2 moths per week) – insecticide applications can be delayed to 1550-1600 DD, or not applied if trap captures remain very low.

In orchards using mating disruption for codling moth and OFM, insecticides targeting second-generation are rarely needed, although pheromone trap monitoring should be used to verify the absence of moths.


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


2020 Average Weekly Trap Captures

HENDERSON COUNTY
Insects per trap
Jun 15 Jun 22 Jun 29
Codling moth  0.3 0.0 0.7
Oriental fruit moth 2.6 1.6 1.0
Tufted apple bud moth 23.0 2.0 4.0
Redbanded leafroller 0.0 0.0 0.0
Obliquebanded leafroller 14.0 2.0 0.0
Lesser appleworm 0.0 0.0 0.0
Apple maggot (abandoned and research orchards) 0.0 0.0 0.7
Brown marmorated stink bug (commercial) 1.1 0.8 1.5
Brown marmorated stink bug (unsprayed) 4.3 1.5 1.9
Spotted tentiform leafminer 0.0 24.0 31.0
Dogwood borer 36.0 9.0 14.0
Peachtree borer 3.0 5.0 9.0
Lesser peachtree borer 54.0 41.0 33.0
San Jose scale 0.0 2.5 190.0

*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.


2020 Accumulated Degree Days

HENDERSON COUNTY
Jun 15 Jun 22 Jun 29
Codling moth (Biofix 4/20) 678 DD 778 DD 919 DD
Oriental fruit moth (Biofix 3/30) 1111 DD 1246 DD 1421 DD
Tufted apple bud moth (Biofix 4/27) 853 DD 988 DD 1163 DD

About degree-day models


2020 Pest Trends

Visit WNC Orchard Insect Populations for archived posts.


Additional Resources