Codling Moth Management Recommendations Based on Degree-day (DD) Accumulations and Percent Egg Hatch from Biofix, 2008.

  Frederick   Rappahannock   Nelson   Botetourt   Patrick/Carroll
Biofix date April 25   April 24   April 24   April 24   April 28
 
Date (2008) DD % hatch   DD % hatch   DD % hatch   DD % hatch   DD % hatch
April 29 36 0   72 0   79 0   73 0   8 0
May 6 111 0   151 0   170 0   156 0   93 0
May 13 167 0   209 0.5   233 1.5   221 1   179 0
May 20 222 1   282 6   310 11   291 8   255 4
May 27 308 10   367 22   403 31   377 24   356 19
June 3 426 37   493 52   532 60   504 55   495 53
June 10 624 78   688 86   737 91   707 88   697 87
June 17 778 94   855 97   911 99   879 98   875 98
JUne 24 905 98   990 100   1051 100   1012 100   1020 100
July 1 1066 0.1   1165 2   1225 4   1170 2.5   1183 3
Estimated percent egg hatch based on Washington State coddling moth egg-hatch model using accumulated degree days from biofix (base temperature = 50°F)


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, 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, 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, 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