Tuesday, August 17, 2010

Extended wetting and increased summer disease activity

Extended wetting Aug. 12-13, 21 hr at 73º (0.58 in. rain at our AREC). There were 64 total wetting hours last week, bringing this year's total to 421. Also extended wetting Aug. 15-16 13.5 hr at 76º (0.24 in. rain)
  Of course any rain we get is much needed, but these rains at warm temperatures do increase the potential for summer diseases, especially bitter rot.  Bitter rot has been observed on fruit which had frost cracks, potentially increasing the inoculum level and disease pressure on healthy fruit.