Oriental Fruit Moth Management in Apple, Based on Degree-day (DD) Accumulations
from Biofix and Percent Egg Hatch, 2009.

  Frederick   Rappahannock   Nelson   Botetourt   Patrick/Carroll
Biofix date April 17   April 5   April 9   April 17   April 9
These timing recommendations are based on complete sprays.
Date (2009) DD % hatch   DD % hatch   DD % hatch   DD % hatch   DD % hatch
April 21 45 2   124 5   117 5   67 3   138 7
April 28 197 15   265 29   269 30   219 19   281 34
May 5 277 32   369 60   385 65   346 53   423 75
May 12 395 68   490 88   509 90   491 88   552 95
May 17 489 88   587 97   604 97   567 96   651 99
May 20 524 92   622 98   640 99   601 97   683 100
May 24 628 98   713 100   730 100   693 100   771 100
May 27 688 100   782 0   806 0   768 0   849 0
May 31 782 0   871 0.5   904 1.5   862 0.3   948 2.5
June 3 855 0   948 3   988 4   941 2   1029 5
June 7 946 2.5   1025 5   1071 7   1030 5   1124 11
June 10 1012 4   1112 10   1158 14   1117 10   1213 21
June 14 1119 10.5   1222 22.5   1269 30   1223 22.5   1322 39
June 17 1189 18   1297 35   1342 43   1295 34   1398 54
June 21 1302 35   1414 57   1467 67   1420 58   1525 76
June 24 1388 52   1498 72   1550 80   1504 73   1612 87
June 28 1507 74   1615 87.5   1670 92   1622 88   1736 96
July 1 1585 84   1703 94   1757 96   1704 94   1819 98
July 5 1677 92.5   1798 97   1850 98.5   1796 97   1914 100
July 8 1752 96   1876 99   1927   1870 99   1992  
July 12 1853 99   1983   2032   1977   2103  
July 15 1932   2068   2116   2057   2187  
July 19 2038   2182   2226   2161   2296  
July 22 2114   2262   2302   2234   2372  
July 26 2226   2380   2421   2344   2487  
July 29 2315   2475   2511   2429   2574  
August 2 2435   2598   2629   2543   2692  
August 5 2524   2691   2719   2626   2779  
August 9 2639   2808   2837   2743   2899  
August 12 2738   2912   2934   2835   2994  
August 16 2865   3037   3056   2957   3113  
August 19 2964   3138   3160   3054   3208  
August 23 3086   3266   3286   3169   3328  
August 26 3176   3353   3375   3252   3412  
August 31 3289   3471   3494   3368   3528  
Estimated percent egg hatch based on Penn State Oriental fruit moth egg-hatch model using accumulated degree days from biofix (base temperature = 45°F)
SkyBit subscriptions for Rappahannock, Nelson, Botetourt and Patrick/Carroll counties are supported by the Virginia Apple Research Program (VARP)


Pink spray to control first brood larvae
Consider 1st brood control at Pink in apple blocks with a recent history of OFM problems (infested fruit at previous harvest). This spray primarily targets adults but will have some residual activity against larvae.
Suggested materials: Assail, Avaunt, Calypso, Clutch, Guthion, Imidan or Lorsban.
Note: Assail and Calypso are used at higher rates for moth larvae than for most other pests (see labels).
Hand-placed dispensers for OFM mating disruption should be deployed during bloom and will provide different lengths of protection depending upon the formulation (see labels). Sprayable OFM pheromone can be applied once per generation (about every 4 weeks), just prior to the onset of moth flight.
Petal fall spray to control first brood larvae
Prepare for petal fall spray to control 1st brood larvae. Optimal timing is at early petal fall.
Suggested materials: Assail, Calypso, Clutch or Intrepid (250 - 275 DD), Avaunt, Imidan, Guthion or Lorsban 75WG (350 - 375 DD).
Note: Assail and Calypso are used at higher rates for moth larvae than for most other pests (see labels).
Control of 2nd brood larvae
Prepare for control of 2nd brood larvae. The first spray for 2nd brood in apple is warranted only if a threshold of >10 moths/trap/week is exceeded.
Suggested materials: Rimon (1000 - 1050 DD), Assail, Calypso, Clutch or Intrepid (1050 - 1100 DD), Altacor, Avaunt, Belt, Delegate, Guthion or Imidan (1150 - 1200 DD).
If trap thresholds are not exceeded at the beginning of 2nd flight, a single spray for this generation can be applied at about the middle of second brood egg hatch.
Suggested materials: Rimon (1300 - 1350 DD), Assail, Calypso, Clutch or Intrepid (1350 - 1400 DD), Altacor, Avaunt, Delegate, Guthion or Imidan (1450 - 1500 DD) For 2nd through 4th broods, use a threshold of >10 moths/trap/week for OFM management decisions.
Hand-placed dispensers for OFM mating disruption should be deployed just prior to the onset of flight and will provide different lengths of protection, depending upon the formulation (see labels). Sprayable OFM pheromone can be applied once per generation (about every 4 weeks), just prior to the onset of moth flight.
Control of third brood larvae
Prepare for control of 3rd brood larvae. From this point forward, the model is not used to predict percent OFM egg hatch in apple. The timing recommendations are based on the best information currently available.
Suggested materials: Rimon (2300 - 2350 DD, then at 2750 - 2850 DD), Assail, Calypso, Clutch or Intrepid (2350 - 2400 DD, then at 2800 - 2900 DD), Altacor, Avaunt, Belt, Delegate, Guthion or Imidan (2450 - 2500 DD, then at 2900 - 3000 DD).
Sprayable OFM pheromone can be applied once per generation (about every 4 weeks), just prior to the onset of moth flight. Use a threshold of >10 moths/trap/week for OFM management decisions.
Depending upon variety, preharvest intervals now become a consideration in product selection.
Control of fourth brood larvae
Prepare for control of 4th brood larvae. This is usually one of the largest broods of the season, and can cause significant damage through harvest. If the threshold of 10 moths/trap/week is exceeded, apply a spray within 7-10 days. Maintain coverage with complete (2-week intervals) or alternate-row-middle (5 to 7 day intervals) sprays as long as trap counts exceed threshold.
Sprayable OFM pheromone applied in late August will provide protection through about mid-October.
Selection of products must now give careful consideration to both restricted entry and preharvest intervals.



Tree Fruit Pest Management