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Table 2 Predicted start dates of the second and third generations of leaf-form nymphs of Daktulosphaira vitifoliae in Canelones Department, Uruguay

From: Life history and assessment of grapevine phylloxera leaf galling incidence on Vitis species in Uruguay

Year Biofix Start date 2ndgeneration Start date 3rdgeneration
(K1 = 303 DD, LTT2 = 6.4°C) (K = 606 DD, LTT = 6.4°C)
2004 1-Oct 2-Nov 30-Nov
2005 1-Oct 3-Nov 26-Nov
2006 1-Oct 30-Oct 25-Nov
  1. Note: Dates were estimated from accumulated degree days since October 1st of each year.
  2. 1 Thermal constant and 2Lower threshold temperature determined by Johnson et al. 2010.