We put quite tall canes around the two plots, with fine netting attached. (about shoulder height) with a 'door' between two of the canes to get in and out. I grow African marigolds around the edge of each plot, which seems to deter most insects. This system also keeps blessed woodpigeons off the young veggies, as they feel unsafe among the netting. We so far haven't had any problems with pests. I rotate stuff from year to year. I use compost from our own heap and bagged organic stuff as well. We've never had tummy troubles or sickness from our produce! I do wash salad stuff well, and of course one boils veggies.