Giving up!

This morning I spoke with my plant guru about the aphids on my crepe myrtles and he said there is basically no sure way of getting rid of them this late in the year. He starts treating the ground around his in January, so I guess that's what I will do next season. I actually started spraying the leaves as soon as they started putting leaves on this year, but that did nothing to solve the problem. Now the leaves are turning yellow and falling off. An acquaintance bought lady bugs through Amazon, but they are dying due to excessive heat in South Texas. Heat would be an issue here as well, so I'm not ordering any.