Current Western NC Orchard Pest Populations

We track local insect populations throughout the growing season using a system of traps, temperature-recording devices, and degree-day models. Traps and weather data are checked weekly, with results updated by Tuesday afternoon from April through September. Learn more about southeastern apple pests at the Apple Pest Management page.

Weekly summary

March 23, 2015

Oriental fruit moth, redbanded leafroller, spotted tentiform leafminer, and San Jose scale traps were set up in the MHCRS orchards in the first week of March. So far, only very small numbers of RBLR and STLM have been captured.

RBLR trap, MHCRS 001

2015 Average Weekly Trap Captures*

Insects per trap Insects per trap
Mar 9
Mar 16
Mar 23

Codling Moth
- - - - - -
Oriental Fruit Moth
0.0 0.0 0.0 - - -
Tufted Apple Bud Moth - - - - - -
Redbanded Leafroller 2.0 2.0 3.0 - - -
Obliquebanded Leafroller - - - - - -
Lesser Appleworm - - - - - -
Apple Maggot - - - - - -
Brown Marmorated Stink Bug - - - - - -
Spotted Tentiform Leafminer 0.0 2.0 1.0 - - -
Dogwood Borer - - - - -
Peachtree Borer - - - - - -
Lesser Peachtree Borer - - - - - -
Plum Curculio - - - - - -
San Jose Scale 0.0 0.0 0.0 - - -

*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.

2015 Accumulated Degree Days

Henderson County      Polk County
  Mar 9
Mar 16
Mar 23

Mar 9
Mar 16
Mar 23
Codling Moth No Biofix
- - - No Biofix
- - -
Oriental Fruit Moth No Biofix - - -
No Biofix
- - -
Tufted Apple Bud Moth No Biofix
- - - No Biofix
- - -
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.

  • 1st generation: Egg hatch begins at about 350 DD after biofix and is completed by 1050 DD. The most critical period for insecticidal control is from 350 to about 750 DD.
  • 2nd generation: Egg hatch of the second generation can extend from about 1300 to 2600 DD after biofix, but the most critical period for insecticidal control is 1400 to about 2500 DD.
  • 3rd generation: Adults begin to emerge at about 2500 DD after biofix, but the model is less accurate in predicting late-season populations.

  • 1st generation: Only one insecticide application between 400 and 500 degree days is usually necessary, as 1st generation egg-laying is usually              low on apple.
  • 2nd generation: Effective 1st-generation control may eliminate the need for 2nd-generation control. If trap captures remain high, insecticides may be needed around 1100 to 1400 DD.
  • 3rd generation: Insecticide may be needed at 2200 DD after biofix.
  • 4th generation: Overlapping generations late in the season make it difficult to predict when 4th-generation egg hatch begins, but continuous egg-laying can occur from August through October. Use traps to determine the need for further insecticide applications.

  • 1st generation: One well-timed insecticide application between 800 and 1200 DD after biofix will often eliminate the need for further control of TABM.
  • 2nd generation: Only if trap captures exceed 25 moths per trap by 2600 DD is an insecticide application recommended. NOTE: Insecticides targeting 2nd generation TABM are usually not necessary if 1st generation populations were successfully controlled.

2015 Pest Trends (click to enlarge)

UPDATED March 23

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