You should think about what strategy you intend to employ against pests. When everything is flowering it might be too late.
Before winter breaks in you should check your greenhouse for pests once more.
Try to keep fallen fruit off of your lawn, rotting fruits encourage pests and diseases.
You should pick bagworms of off your evergreens, that way there will be less of them next spring!
Your greenhouse should be cleaned thoroughly before winter, this way pests will have a harder time.
Since all crop from the greenhouse should be harvested by now, clean it thoroughly to prevent pests.