Hi Polly
Your ground spraying may be the secret. I left a few WhiteHenriis at my old house and the beetles devoured them
The new owners are kids and didnt know what to do.
I believe they are more wide spread in NYState than anyone knows.
Last spring on the Lily Forum someone posted what she did to controle them
She had entemological language but the gist of it was logical.
She sprayes in early spring just as the pinapple tops peek out of the soil. I believe she used Bayer product. I used Sevin and sprayed the emerging lily and the ground around it.When the plants were 24 inches hi I sprayed again and did this weekly all summer.
In mid summer I sprayed plant and ground because the LilyForum person said the beetle is a 2 phase insect and it lays eggs twice in one season. The Larve live 1/2 inch below the soil.
I had very little damage.
