Year | Number of varieties | 2nd generation (> 10 larvae)a | 3rd generation (> 13 larvae)b | 4th generation (> 13 larvae)c | Ratiosd per generation/% | ||
---|---|---|---|---|---|---|---|
2nd | 3rd | 4th | |||||
2008 | 35 | 0 | 1 | 2 | 0.0 | 2.9 | 5.7 |
2009 | 29 | 5 | 3 | 2 | 17.2 | 10.3 | 6.9 |
2010 | 22 | 0 | 1 | 0 | 0.0 | 4.5 | 0.0 |
2011 | 22 | 9 | 0 | 0 | 40.9 | 0.0 | 0.0 |
2012 | 21 | 1 | 0 | 0 | 4.8 | 0.0 | 0.0 |
2013 | 21 | 1 | 0 | 0 | 4.8 | 0.0 | 0.0 |
2014 | 23 | 2 | 3 | 1 | 8.7 | 13.0 | 4.3 |
2015 | 24 | 2 | 0 | 0 | 8.3 | 0.0 | 0.0 |