As of today, July 13, the NEWA weather system shows that 2138 DD (degree days) have accumulated for oriental fruit moth (OFM) at Winchester. We are now in the third generation of OFM and optimal timings in peaches for this brood are as follows: Assail or Intrepid at 2000-2100 DD, then at 2350-2400 DD; all other insecticides at 2100-2200 DD, then at 2450-2500 DD. In apples, optimal timing for third brood OFM is as follows: Rimon at 2300-2350 DD; Assail, Belay or Intrepid at 2350-2400 DD, then at 2800-2900 DD; all other insecticides at 2450-2500 DD, then at 2900-3000 DD. OFM management is warranted if weekly captures in pheromone traps have exceeded an average of 10 moths/trap. The daily forecast for OFM DD from July 14 – 18 is as follows: 2170, 2203, 2239, 2276, and 2312.
For codling moth, management of the second half of second generation is approaching if weekly captures in pheromone traps have exceeded an average of 5 moths/trap. As of today, July 13, 1513 DD have accumulated for CM at Winchester. Optimal timings for CM at this point in the season are as follows: Rimon at 1650 DD; Assail, Belay, CM virus, Esteem, or Intrepid at 1650-1700 DD; all other insecticides at 1750-1800 DD. The daily forecast for CM DD from July 14 – 18 is as follows: 1540, 1568, 1599, 1631, and 1662.
Until next time, best wishes.