| Year | Sampling date | Number of trees sampled in P1 | Number of trees sampled in P2 | |||
| P1 | P2 | Q. ilex | Q. suber | Q. ilex | Q. suber | |
| 2007 | 7 June | 25 June | 60 | 0 | 30 | 30 |
| 2008 | 2 May | 6 May | 52 | 8 | 42 | 18 |
| 2009 | 16 June | 12 June | 60 | 0 | 25 | 35 |
| 2010 | 6 May | 7 May | 38 | 22 | 27 | 33 |
| 2012 | 12 June | 19 May | 43 | 17 | 42 | 18 |
| 2013 | 20 June | 28 June | 48 | 12 | 58 | 2 |
| 2017 | 9 June | 15 June | 48 | 12 | 39 | 21 |