"介绍上都说要等到八、九月份再施杀虫剂" for a reason, because chemical is much effective on young grubs.
I don't think you have big grub problem, because if you do, large pieces of grass are already dead.The demage was done last fall not now. They just try to sell you another service.
And you at pretty bad situation. To save the grass seeds, you have to water them throughout the summer. A moist lawn would attract more bugs to lay eggs then the bigger grub problem this fall.
Weedman is very good at making money.
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