Oriental fruit moth monitoring, biofix in northern Ohio

General Fruit Growing
#1

I’m wondering if there is anyone from northern Ohio that monitors for oriental fruit moth. This is the first year that I’ve attempted to trap moths and count degree days. I’ve only caught a few in my traps so far and have not set biofix yet. The traps are a pheromone lure and listed for OFM and CM. I feel like it’s getting late in the season but I don’t really know, I might be jumping the gun. As typical to Ohio the weather was all over the place this spring and now are having a stretch of days in the 90’s. The new growth on my peach trees were ravaged last year by OFM. The trees are now in their 4th year and should have a decent first crop, if I can stay on top of it. Thanks for any input.

1 Like
#2

Here’s a fragment of the config file for my Phenology Project:

  [[Grapholita molesta]]
    name_common = "Oriental Fruit Moth"

    [[[Model C0097]]]

#     Croft, B. A., M. F. Michels, and R. E. Rice.  1980.  Validation of a
#     PETE timing model for the oriental fruit moth in Michigan and central
#     California (Lepidoptera: Olethreutidae).  Great Lakes Entomol. 13:
#     211-217.

#     Location of study:  Parlier, California (field studies)

      ref = "http://ipm.ucanr.edu/PHENOLOGY/ma-oriental_fruit_moth.html"

      threshold = 7.2, degree_C
      cutoff = 32.2, degree_C
      method = gdd_single_sine_horizontal_cutoff
      start_date = Jan, 1

      [[[[Stages]]]]
#       Host  Peaches
#       First moth catch
#       None
#       Biofix First moth catch
#       "Pre-egglaying adults" = 27.8, degree_C_day
        "Eggs" = 79.4, degree_C_day
#       "Larvae" = 215.0, degree_C_day
#       "Pupae" = 212.8, degree_C_day
#       "Generation time (egg to egg)" = 535.0, degree_C_day

    [[[Model C0098]]]

#     Rice, R. E., C. V. Weakley, and R. A. Jones.  1984. Using degree-days
#     to determine optimum spray timing for the oriental fruit moth
#     (Lepidoptera: Tortricidae).  J. Econ. Entomol.  77: 698-700.

#     Location of study:  Parlier and Yuba City, California (field studies)

      ref = "http://ipm.ucanr.edu/PHENOLOGY/ma-oriental_fruit_moth.html"

      threshold = 7.2, degree_C
      cutoff = 32.2, degree_C
      method = gdd_single_sine_horizontal_cutoff
      start_date = Jan, 1
#     biofix = First male moth trapped
      biofix_is_required = True
      biofix = None, degree_C_day

      [[[[Stages]]]]
#       Host  Peaches
#       Biofix First male moth trapped
#       "Pre-egglaying adults + Eggs" = 111.1, degree_C_day
#       "Larvae" = 215.0, degree_C_day
#       "Pupae" = 210.0, degree_C_day
#       "Generation time (adult to adult)" = 536.1, degree_C_day
#       None
#       Biofix  Start of second flight (usually early May)
#       "Time to treat" = 278.0, 333.3, degree_C_day

For OFM, I found two mathematical models, which I call C0097 and C0098. Both were validated in California on peaches in the 1980s by the same people. I don’t raise peaches, so I don’t use these models.

It’s pretty vague to me how these models differ. Perhaps C0098 is for the second flight in California. You may find the reference enlightening. It looks as though eggs are present from about 80 to about 215 Cumulative Growing Degree Days Centigrade, starting from first trap catch. Here in Sheboygan, WI, we’ve begun to accumulate nearly 6°C per day, so from trap to egg-laying would be less than two weeks.