Yes, male flowers.
Unless you want a seeded crop, removal is your only option.
Feminised seeds are unfortunately not 100% guaranteed.
Tetraploids are not polyploids and usually turn out male by the way......or hermies, due to having defective genes (the genes that cause the plant to be tetraploid - 3 growing nodes per branch site).
True, spontaneous ployploids are as rare as unicorns!