Several New Aspects of the Foraging Behavior of Osmia cornifrons in an Apple Orchard

Table 2

Rate of dehiscere anthers within a balloon-stage “Maypole”.

No. of flowers	Year	No. of flowers having at least 1 dehiscere anther	Rate of flowers having at least 1 dehiscere anther (mean $\pm$ S.E.%)	No. of anthers/ flower	No. of dehiscere anthers/ flower	Rate of dehiscere anthers/flower (mean $\pm$ S.E.%)
10	2006	7	70.0	17.5	2.0	11.4
10	2007	4	40.0	19.4	1.1	5.7
10	2007	5	50.0	19.6	2.9	14.8
10	2007	4	40.0	19.1	1.6	8.4
10	2007	5	50.0	19.2	1.7	8.9
10	2007	3	30.0	18.1	0.3	0.02
			46.7 $\pm$ 5.6			8.2 $\pm$ 2.1