He concluded that by the time the style becomes receptive, the germination of the floret's own pollen is about past. The flower morphology and the flower morphogenesis of Pyrethrum resemhles closely the classical concept known in the Compositae. When insects visit the inflorescence their path follows the development of the flower, i.e., from the margin to the centre, in order to collect pollen and nectar. Thus they deposit the foreign pollen they carry on fully opened styles. By sticking together, the pollen mass encourages transport by insects.
Strong evidence exists that the incompatibility system is sporophytically determined.
The limited life of the pollen after anthesis reduces the chance for own pollen to germinate on styles of the same floret. The previous references indicate that honey bees are not overly attracted to pyrethrum flowers, as compared to beetles and flies. There has been no attempt to concentrate honey bee colonies near the crop. A test should be conducted to determine the practicality of supplying honey bee colonies to pyrethrum fields for pollination purposes. The use of leafcutter and other wild bees and different species of flies should also be investigated.