Combined Effects of Pesticides and Electromagnetic-Fields on Honeybees: Multi-Stress Exposure.

GLM on Log-transformed data showed that week of sampling was highly significant (F 21;209 = 6.0; p < 0.001 ***) as well as the intra-treatment variability (F 3;209 = 4.5; p = 0.004 **), confirming that varroa mite infestation was irregularly but equally distributed among exposure and control sites, depending on the season (“date” factor) and on the single-hive history (“hive” factor).

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For example, AChE activity showed a decreasing trend from April until November, with the maximum in June when the hive activities are at maximum.

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