Cover the plants with floating row cover if you can find any, or with tulle netting from a fabric store if you cannot. It is best to suspend it over hoops or some sort of framing to hold it above the plants. The summerweight insect-type row covers are very lightweight and allow sunlight through and allow fairly good air flow. In their absence, tulle will work, but it tears more easily, so really much be suspended over a framework of some kind.

To support mine, I stick pieces of rebar into the ground on either side of the row of squash several, hammering them in so they are good and deep in the ground and are not easily moved, but leaving several inches above ground and then insert PVC pipe over the end of a piece of rebar on one side of the row. I then bend it over the row and force the other end of the PVC down over the rebar on the other side of the row. I place these every few feet, drape row cover over the hoops, and use bricks, pieces of lumber, metal t-posts or U-shaped landscape fabric staples to hold down the cover tightly to the ground. This is really important because it keeps pests from getting underneath the row cover.

Using hoops covered with fabric like this, or with greenhouse plastic in cold weather, is a method of protecting plants. Often these areas are referred to as low tunnels. I'll link a page that shows some low tunnels.

Dawn

Here is a link that might be useful: Noble Foundation: Low Tunnels

Since you have already seen bugs, you probably already have eggs. Lift each leaf and look on the underside. If you have eggs they will hatch before you come back so covering them up won't help much unless you destroy all of those eggs before you cover the plants.