May 1
Grape leaf skeletonizer flying now in the Summerlin area. I would apply Spinosad instead of Bt since it will reduce the leafhopper population as well. They are about three weeks late. Spray leaf undersides and top. Repeat in three to four weeks.
They showed up a couple weeks ago at our house. They wiped out my grapevine last year. Hoping I can keep that from happening this year.