Can anyone identify what these are? They are all over all of my lilies but nothing else. What are they and should I kill them or let them be, as the plant is done blooming for the year anyway. I've seen spiders, wasps and other things eating them so I don't want to upset the eco system if they aren't really harming the plant except cosmetically for right now. They did not show up until long after the blooms had all faded. Thanks in advance for your help!