I have had the same garden plants for at least 15 years. I have in the past had a lot of Monarchs in Aug and Sept. I have at least 3 dead Monarch this year. I picked up one and it looks like something ate the majority of the body!
I have 2 Rose of Sharon and 2 Bottle brush shrubs planted in a row and they are all at least 15 years old.
I noticed a new beetle in the Rose of Sharon plants.
Could these new beetles be killing the Monarch!
The beetles are black with blue and purple bodies.
I do not have any milkweed this year, so I know I do not have the wrong ones.
All ideas, suggestions welcome
Thank you for contacting the Toronto Master Gardeners. According to my research there are a number of common predators of monarchs some of which include : wasps, ants, parasitic flies, birds, snakes, toads, rats, lizards, and dragonflies. Without a photo of the beetle it is difficult to determine whether this is the culprit.