observe critically/minutely an inflorescence during peak visit time of pollinators. otherwise you have to face many problems if you remove those important parts from the flowers. otherwise you install a good camera for continuous observation on a particular inflorescence during peak pollination time. take reading which parts they are preferring. many other methodology may be there. but this is the simple method we follow to study bee foraging in Brassica spp.

Dear Wang,

In order to give the correct answer, you need to tell what type of inflorescence in question. But in any case, for a correct understanding of preferences is necessary to determine the amount of nectar in each flower in each of the three days of it flowering. Further, it is necessary to determine the state of pollen in each of the three days of flowering and fertility of the pestle. For the research necessary to use light nylon insulators that covers the flowers, and then open it at the one of the 3 days of flowering.

Best regards,

Vladimir

I suggest you to test the attraction of foragers or pollinators to flowers with fertile stamen and staminodes, without fertile stamen and staminodes, with only staminodes, with only fertile stamens separately. Further, see colour change in each of these tests. Then you will get the result that you expect.

You could use an 'interview stick' (James Thomson's invention) to present two different kinds of flowers/inflorescences to foraging bees and see which one they choose.

Ii the first time it need to see & distinguish the visitors from pollinators,

in this case you can understood the dynamic of plant pollinisation … etc.