Codling Moth Management Recommendations Based on Degree-day (DD) Accumulations
and Percent Egg Hatch from Biofix, 2009.

  Frederick   Rappahannock   Nelson   Botetourt   Patrick/Carroll
Biofix date May 2   May 2   April 28   April 25   April 25
 
Date (2009) DD % hatch   DD % hatch   DD % hatch   DD % hatch   DD % hatch
May 5 0   34 0   105 0   189 0   195 0
May 12 106 0   123 0   196 0   279 6   290 8
May 17 165 0   197 0   268 5   354 19   365 21
May 20 191 0   220 1   293 8   377 24   387 27
May 24 275 6   294 8   364 21   449 42   456 44
May 27 320 12   348 18   425 36   509 56   519 58
May 31 394 29   417 34   503 55   583 70   598 73
June 3 454 44   478 49   572 68   646 81   664 83
June 7 505 55   536 61   635 79   715 89   739 91
June 10 576 69   608 75   707 88   787 94   813 95.5
June 14 663 85   698 87   798 95   873 98   902 98.5
June 17 719 89   758 92   856 97.5   930 99   963 99.3
June 21 811 95.5   855 97.5   961 99   1035 0   1070 0.25
June 24 883 98   924 99   1029 100   1104 1   1142 2
June 28 981 99.5   1021 100   1129 2   1201 3   1246 6
July 1 1044 0   1094 0.75   1201 3   1268 7.5   1314 10.5
July 5 1116 1.5   1169 2.5   1274 7.5   1340 14   1389 19
July 8 1176 3   1232 4.5   1336 14   1400 21   1452 29
July 12 1258 7   1319 11   1421 27   1486 34   1543 43
July 15 1321 11   1388 19   1490 35   1551 45   1612 54
July 19 1407 22   1482 33   1578 50   1635 59   1701 69
July 22 1468 31   1547 45   1639 60   1693 68   1762 76
July 26 1560 46   1645 61   1738 74   1738 74   1857 86
July 29 1634 59   1725 72   1813 82   1853 86   1929 91.5
August 2 1734 73   1828 84   1911 90   1947 92   2027 96.5
August 5 1808 82   1906 90   1986 94.5   2015 96   2099 99
August 9 1902 89   2003 95   2084 98   2112 99.5   2198 2.9
August 12 1986 94.5   2089 98.5   2165 1.5   2188 2.5   2277 7
August 16 2091 98.5   2194 2.5   2267 6   2290 7.5   2376 14
August 19 2175 2   2280 7   2354 11.5   2372 13   2456 22
August 23 2277 7   2388 15   2460 22   2467 23   2556 35
August 26 2351 11.5   2460 22   2534 31   2535 31   2625 >37
August 31 2445 20   2556 35   2633 >37   2631 >37   2721 >37
Estimated percent egg hatch based on Washington State codling moth egg-hatch model using accumulated degree days from biofix (base temperature = 50°F)
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BLUE CELL
Prepare to control 1st brood CM larvae with 1st cover spray. A spray targeting CM beginning at 1st cover and throughout the season is warranted if trap counts exceed the threshold of 5 moths/trap/week.
Suggested materials: Rimon (50-150 DD, then at about 400 DD), Assail, Calypso, Clutch, Carpovirusine, Cyd-X or Intrepid (150 DD, then at 450 DD), Altacor, Belt, Avaunt, Delegate, organophosphates, carbamates, or pyrethroids (250 DD, then at 550 DD).
Hand-placed CM mating disruption treatments should be deployed just prior to first moth flight and will provide different lengths of protection, depending upon the formulation (see labels).
RED CELL
Prepare for control of 2nd brood CM larvae.
Suggested materials: Rimon (1050-1150 DD, then at about 1450 DD), Assail, Calypso, Clutch, Carpovirusine, Cyd-X or Intrepid (1150 DD, then at 1450-1500 DD), Altacor, Avaunt, Belt, Delegate, organophosphates, carbamates or pyrethroids (1250 DD, then at 1550-1600 DD).
YELLOW CELLS
Indicates onset of third codling moth flight. Third brood larvae typically do not complete development and overwinter, but can cause significant damage late in the season. Use a trap threshold of >5 moths/trap/week to initiate controls and apply a treatment within 5-7 days.
Suggested materials: Optimal timing for complete or alternate-row-middle sprays of Assail, Calypso, Clutch, Carpovirusine, Cyd-X, Intrepid or Rimon is at 2180-2200 DD, and later for Altacor, Avaunt, Belt, Delegate, organophosphates, carbamates or pyrethroids, at 2270-2330 DD. An alternate-row-middle spray should be applied again after 5-7 days. Additional complete sprays after 14 days or alternate-row-middle sprays at 7-day intervals may be required if trap counts continue to exceed threshold. Preharvest intervals are now an important consideration for some varieties.

Tree Fruit Pest Management