Something like an egg grows on my flower stem. Help me see what it is.

Scale insects, whose scientific name seems to be tree lice, are juice-sucking pests. Find some pesticides to spray. Once the waxy shell is formed, it will be very difficult to handle. It is best to remove the visible shell manually before spraying. Netizen zzx 194602 15 mentioned that all pesticides containing EC have the function of killing scale insects. Once the scale insects get rid of it, they can't survive.