Pesticide in week7 of flowering

Hello, my first grow out of a random seed. I'm in week 7 of flower on this outdoor "sativish?", I had some whiteflies for a while, but kept shaking and hand cleaning leaves. This week while shaking, a green worm (caterpillar I think) fell into the soil. Did the research on the forum, Spinosad was recommended, the only product I could find was Natural Guard Spinosad Soap by Ferti-Lome, and at day's end I sprayed the whole plant but conservatively without drenching. I put the plant inside for the night 77f@40%RH with an 10in oscillating fan blowing 5ft away. I turned the fan off at midnight for slower drying. This morning most of the pistils where brownish. Please advise. Thanks
P.S. : Last two pics are from this morning, the other pics are from yesterday and last week

Should I get myself a microscope and keep an eye on the trichs?

beautiful colas Jean-Marie. from québec?
a microscope helps a lot to look at the trichomes.

Thanks, growing in Rambouillet. Best I could do with a macro lens