WNC Orchard Insect Populations for June 12, 2018
First generation codling moth flight has subsided in both the mountains and piedmont locations. The only location where codling moth remains a threat, and where insecticidal control should continue, is where populations are historically high. This includes orchards adjacent to poorly managed orchards or where wooden apple bins (originating from other states) are stored.
We are in the midst of second-generation OFM flight, but as mentioned last week, this generation is usually of little threat where the first generation was adequately controlled. Based on recent observations in commercial orchards, there is very little if any damage by first-generation codling moth or OFM.
If an insecticide effective against TABM, such as Altacor (or Voliam Flexi), Delegate or Intrepid, has not been applied within the last two weeks, an application should be made within the next week.
Finally, we’re approaching that time of the year when apple aphids and potato leafhopper populations are beginning to appear. Both insects prefer to feed on new shoot growth. Now is a good time to scout orchards to determine the need for control. They are easily controlled with a range of neonicotinoids or closely related compounds, such as Admire, Assail, Actara, Closer, or Sivanto.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2018 Average Weekly Trap Captures*
|Insects per trap|
|Oriental Fruit Moth||5.7||13.0||16.0|
|Tufted Apple Bud Moth||12.0||11.0||1.0|
|Brown Marmorated Stink Bug (commercial – mountains)||1.3||1.7||1.5|
|Brown Marmorated Stink Bug (commercial – upper piedmont)||3.7||2.0||0.7|
|Brown Marmorated Stink Bug (research – unsprayed)||0.3||2.0||2.5|
|Spotted Tentiform Leafminer||0.0||0.0||40.0|
|Lesser Peachtree Borer||25.0||20.5||42.5|
|San Jose Scale||0.0||0.0||7.5|
*Note that averages presented here are intended only to illustrate the timing of insect emergence and fluctuations in population activity, and not as general indicators of population levels. Some orchards included in these averages have significantly higher or lower populations than most commercial orchards in the area, resulting in averages that are sometimes skewed from what is typical. The only way to have an accurate assessment of an individual orchard’s populations is to set up traps in that orchard.
2018 Accumulated Degree Days
|Codling Moth||Apr 30||501||654||797|
|Oriental Fruit Moth||Apr 2||883||1071||1249|
|Tufted Apple Bud Moth||May 4||564||752||929|
|About degree-day models: The degree day (DD) models predict adult emergence and egg hatch of each generation. They do not predict the intensity of populations, which can be assessed by using pheromone traps. Hence, the models should be used to help gauge the time period when control is most likely needed, and pheromone traps provide information on the need for and frequency of insecticide applications. For full details, read “IPM Practices for Selected Pests” in the Orchard Management Guide.|
ORIENTAL FRUIT MOTH:
TUFTED APPLE BUD MOTH: