Table 3.
Losses attributed to queen problems, varroa, and other factors, between the years 2015–2021 *.
| Year | Queen Problems | Suspected Varroa | Suspected Starvation | Wasps | All Other Causes |
|---|---|---|---|---|---|
| 2021 | 24.0% | 38.9% | 7.0% | 12.0% | 18.1% |
| 2020 | 33.1% | 31.0% | 7.6% | 6.6% | 21.7% |
| 2019 | 30.3% | 28.1% | 10.3% | 9.6% | 21.7% |
| 2018 | 35.5% | 19.5% | 12.1% | 12.1% | 20.8% |
| 2017 | 34.4% | 16.9% | 13.9% | 9.7% | 25.1% |
| 2016 | 29.3% | see note * | 17.2% | 11.7% | 41.8% |
| 2015 | 35.7% | see note * | 15.6% | 14.9% | 33.8% |
* The questionnaire was substantially revised in 2017. Therefore, the attributions of losses for 2015 and 2016 may not be directly comparable to those for 2017 onwards. Suspected varroa was included in the category “all other causes” for the 2016 and 2017 survey.