All spiders feed by injecting enzymes into their prey. Then they swallow the resulting fluid.
I have fed large orb weaving spiders to quads, and had no problems.
I know of no instances oif spiders carrying parasites that have reptiles as intermediate hosts.
Its highly unlikely that your spider was contaminated with insecticide, or it would be dead.
I have a light trap that captures moths and other night-flying insects. This is a major source of cham food during the summer.
I see a lot of comments about field chemicals. What is the source of this information?