In the case of blueberries, I prefer permanent heavy gauge plastic mesh with one inch squares to give easy access to the bumblebees and wrens while excluding all others. It happens that I grow my grapes and watermelons in the same patch, and require electric and garden fencing and bird netting, but only during August and September. It would be remiss of me not to mention nature's balance once again. Small mammals are part of the grand plan. Hedgehogs destroy earwigs, raccoons eat grubs, and skunks eat the equivalent of their own weight several times a week in harmful moths, grasshoppers, snails, slugs, grubs, gophers, and mice.
Moles feed on japanese beetle grubs and a variety of other insects.
They can consume as many as 200 sawfly cocoons per day. The shrew has an even better record. It can gobble its own weight in grubs and cutworms in just 3 hours, and has been observed to eat over three times its own body weight day after day. This is why fencing critical areas is the most effective control measure you can employ. However, in urban settings, these populations can quickly expand to nuisance proportions in the absence of their natural predators.