Seasonal climate signals driving flowering of Robinia pseudoacacia in Piedmont (Italy): implications for apiculture under climate change.

The relationship between the BBCH61 phase and mTmax_winter was negative and highly significant (β = –3.94 ± 0.76 days/°C, p-value < 0.001), indicating that a 1 °C increase of the index is associated with an advancement of about 4 days in flowering onset.

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When a significant trend was detected (p-value < 0.05), the series was detrended by removing the fitted linear component.

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