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Table III
Level of Varroa destructor infestation – as determined from adult bee samples collected in autumn – in all colonies and given separately for those colonies which survived or collapsed in the subsequent winter.
| Infestation level in % ± sd | ||||||
|---|---|---|---|---|---|---|
| 2004 | 2005 | 2006 | 2007 | Σ n | P-value1 | |
| All colonies | 3.1 ± 5.8 | 4.7 ± 8.9 | 4.4 ± 8.6 | 5.1 ± 8.5 | ||
| (N) | (315) | (1065) | (1092) | (1117) | (3589) | |
| Surviving colonies | 3.1 ± 5.9 | 3.2 ± 5.9 | 3.5 ± 6.7 | 3.6 ± 6.4 | ||
| (N) | (311) | (927) | (1013) | (966) | (3217) | |
| Collapsed colonies | 1.7 ± 2.0 | 14.6 ± 17.0 | 16.5 ± 18.0 | 14.8 ± 13.5 | < 0.000001 | |
| (N) | (4) | (138) | (79) | (151) | (372) | |