Did you bring along some insect spray?

你有没有带些杀虫喷液来？

Did you bring along some insect spray (to kill the insects)?

你有带来一些昆虫喷洒剂(来杀昆虫)吗？

It is recommended that you bring insect spray and sun screen in late Spring, Summer and early Fall.

在晚春，夏季和早秋时节，你最好带蚊虫喷剂和涂防晒霜。

It is recommended that you bring insect spray and sun screen in late Spring, Summer and early Fall. You may also want to bring a small container of water.

晚春、夏季和早秋时节，最好携带蚊虫喷剂和防晒霜，也许还要带一小瓶饮用水。

But I do have a hard time protecting myself from insect repellents that humans sometimes spray on plants.

但我确实也有不好过的时候，就是保护自己免受有时人类喷洒在植物上的驱虫剂的侵害。