Because a female U. crassicornis only mates once in her life (typically), males are forced to search and compete for a female.
the way they do this is called the 'fly-call-walk' strategy  in which a male will fly from one plant to another, then will walk around and strut, once encountering a female, the male will present vibrational signals to the female and if there is no response he will fly to another tree.
If the female responds to his vibrations the male will approach the female and climb onto her side to initiate mating.
Because a female U. crassicornis only mates once in her life (typically), males are forced to search and compete for a female. the way they do this is called the 'fly-call-walk' strategy  in which a male will fly from one plant to another, then will walk around and strut, once encountering a female, the male will present vibrational signals to the female and if there is no response he will fly to another tree. If the female responds to his vibrations the male will approach the female and climb onto her side to initiate mating.
Umbonia crassicornis